{"id":1991,"date":"2025-03-24T08:48:32","date_gmt":"2025-03-23T23:48:32","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1991"},"modified":"2025-03-24T08:48:57","modified_gmt":"2025-03-23T23:48:57","slug":"c%e3%81%aeabs%e9%96%a2%e6%95%b0%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e6%ad%a3%e3%81%97%e3%81%84%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%a8%e6%b3%a8%e6%84%8f%e7%82%b9%e3%82%92%e5%be%b9","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1991","title":{"rendered":"C++\u306eabs\u95a2\u6570\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u3068\u6ce8\u610f\u70b9\u3092\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">C++\u3067\u306eabs\u95a2\u6570\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">abs\u95a2\u6570\u306e\u5b9a\u7fa9\u3068\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-2\">\u7570\u306a\u308b\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb\u306b\u5b58\u5728\u3059\u308babs\u95a2\u6570\u306e\u9055\u3044<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">\u623b\u308a\u5024\u306e\u578b\u3068\u5f15\u6570\u306e\u578b\u306b\u3064\u3044\u3066<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-4\">abs\u95a2\u6570\u4f7f\u7528\u6642\u306e\u6ce8\u610f\u70b9\u3068\u843d\u3068\u3057\u7a74<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-5\">\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-6\">\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3067\u306e\u7cbe\u5ea6\u306e\u554f\u984c<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-7\">\u7570\u306a\u308b\u578b\u3067\u306e\u6697\u9ed9\u7684\u306a\u578b\u5909\u63db\u306e\u7f60<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">abs\u95a2\u6570\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">\u6570\u5024\u8a08\u7b97\u3067\u306e\u52b9\u679c\u7684\u306a\u4f7f\u3044\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-10\">\u7269\u7406\u6f14\u7b97\u3067\u306e\u4f7f\u7528\u4f8b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">\u30b2\u30fc\u30e0\u958b\u767a\u3067\u306e\u6d3b\u7528\u30b7\u30fc\u30f3<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">abs\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u3068\u6761\u4ef6\u5206\u5c90<\/a>      <\/li>      <li>        <a href=\"#i-14\">\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u7248abs\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">SIMD\u547d\u4ee4\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u901f\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-16\">C++17\u4ee5\u964d\u3067\u306eabs\u95a2\u6570\u306e\u65b0\u6a5f\u80fd<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">constexpr\u5bfe\u5fdc\u306b\u3088\u308b\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u8a08\u7b97<\/a>      <\/li>      <li>        <a href=\"#i-18\">\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u306e\u7d71\u5408<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u65b0\u3057\u3044\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306e\u8ffd\u52a0<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">C++\u3067\u306eabs\u95a2\u6570\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">abs\u95a2\u6570\u306e\u5b9a\u7fa9\u3068\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>abs\u95a2\u6570\u306f\u3001\u4e0e\u3048\u3089\u308c\u305f\u6570\u5024\u306e\u7d76\u5bfe\u5024\uff08absolute value\uff09\u3092\u8fd4\u3059\u95a2\u6570\u3067\u3059\u3002C++\u3067\u306f\u3001\u8907\u6570\u306e\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb\u3067\u7570\u306a\u308b\u30d0\u30fc\u30b8\u30e7\u30f3\u306eabs\u95a2\u6570\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u6700\u3082\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cstdlib&gt;  \/\/ C\u8a00\u8a9e\u4e92\u63db\u306eabs()\n#include &lt;cmath&gt;    \/\/ \u3088\u308a\u5e83\u7bc4\u306a\u6570\u5024\u578b\u306b\u5bfe\u5fdc\u3057\u305fabs()\n\nint main() {\n    int x = -42;\n    long y = -12345L;\n    float z = -3.14f;\n    double w = -2.718;\n\n    \/\/ \u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\n    int abs_x = abs(x);      \/\/ \u7d50\u679c: 42\n    long abs_y = labs(y);    \/\/ \u7d50\u679c: 12345\n    float abs_z = fabs(z);   \/\/ \u7d50\u679c: 3.14\n    double abs_w = fabs(w);  \/\/ \u7d50\u679c: 2.718\n\n    return 0;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u7570\u306a\u308b\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb\u306b\u5b58\u5728\u3059\u308babs\u95a2\u6570\u306e\u9055\u3044<\/h3>\n\n\n\n<p>C++\u3067\u306f\u3001abs\u95a2\u6570\u306f\u8907\u6570\u306e\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>&lt;cstdlib&gt;<\/code><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>C\u8a00\u8a9e\u3068\u306e\u4e92\u63db\u6027\u3092\u6301\u3064\u57fa\u672c\u7684\u306aabs\u95a2\u6570\u7fa4<\/li>\n\n\n\n<li><code>abs()<\/code>, <code>labs()<\/code>, <code>llabs()<\/code>\u3092\u63d0\u4f9b<\/li>\n\n\n\n<li>\u6574\u6570\u578b\u306b\u7279\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>&lt;cmath&gt;<\/code><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u3088\u308a\u5e83\u7bc4\u306a\u6570\u5024\u578b\u3092\u30b5\u30dd\u30fc\u30c8<\/li>\n\n\n\n<li><code>fabs()<\/code>, <code>fabsf()<\/code>, <code>fabsl()<\/code>\u3092\u63d0\u4f9b<\/li>\n\n\n\n<li>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306b\u5bfe\u5fdc<\/li>\n\n\n\n<li>C++11\u4ee5\u964d\u3067\u306f<code>std::abs()<\/code>\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3082\u542b\u3080<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>&lt;complex&gt;<\/code><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8907\u7d20\u6570\u306e\u7d76\u5bfe\u5024\u8a08\u7b97\u7528<\/li>\n\n\n\n<li><code>std::abs(std::complex&lt;T&gt;)<\/code>\u3092\u63d0\u4f9b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u623b\u308a\u5024\u306e\u578b\u3068\u5f15\u6570\u306e\u578b\u306b\u3064\u3044\u3066<\/h3>\n\n\n\n<p>abs\u95a2\u6570\u306e\u623b\u308a\u5024\u306e\u578b\u306f\u3001\u4f7f\u7528\u3059\u308b\u95a2\u6570\u3068\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cstdlib&gt;\n#include &lt;cmath&gt;\n#include &lt;complex&gt;\n\nint main() {\n    \/\/ \u6574\u6570\u578b\u3067\u306e\u4f7f\u7528\n    int i = abs(-42);                    \/\/ int\u578b\u3092\u8fd4\u3059\n    long l = labs(-42L);                 \/\/ long\u578b\u3092\u8fd4\u3059\n    long long ll = llabs(-42LL);         \/\/ long long\u578b\u3092\u8fd4\u3059\n\n    \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u3067\u306e\u4f7f\u7528\n    float f = std::abs(-42.0f);          \/\/ float\u578b\u3092\u8fd4\u3059\n    double d = std::abs(-42.0);          \/\/ double\u578b\u3092\u8fd4\u3059\n    long double ld = std::abs(-42.0L);   \/\/ long double\u578b\u3092\u8fd4\u3059\n\n    \/\/ \u8907\u7d20\u6570\u3067\u306e\u4f7f\u7528\n    std::complex&lt;double&gt; c(3.0, 4.0);\n    double magnitude = std::abs(c);       \/\/ \u8907\u7d20\u6570\u306e\u7d76\u5bfe\u5024\uff085.0\uff09\u3092\u8fd4\u3059\n\n    return 0;\n}<\/pre>\n\n\n\n<p>\u7279\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u306a\u306e\u306f\u3001\u5f15\u6570\u306e\u578b\u3068\u623b\u308a\u5024\u306e\u578b\u306e\u95a2\u4fc2\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>abs(int)<\/code> \u2192 <code>int<\/code>\u3092\u8fd4\u3059<\/li>\n\n\n\n<li><code>labs(long)<\/code> \u2192 <code>long<\/code>\u3092\u8fd4\u3059<\/li>\n\n\n\n<li><code>llabs(long long)<\/code> \u2192 <code>long long<\/code>\u3092\u8fd4\u3059<\/li>\n\n\n\n<li><code>fabs(float\/double\/long double)<\/code> \u2192 \u540c\u3058\u578b\u3092\u8fd4\u3059<\/li>\n\n\n\n<li><code>std::abs(std::complex&lt;T&gt;)<\/code> \u2192 \u5bfe\u5fdc\u3059\u308b\u5b9f\u6570\u578b\uff08T\uff09\u3092\u8fd4\u3059<\/li>\n<\/ul>\n\n\n\n<p>\u9069\u5207\u306a\u578b\u306e\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4e0d\u5fc5\u8981\u306a\u578b\u5909\u63db\u3092\u907f\u3051\u3001\u3088\u308a\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-4\">abs\u95a2\u6570\u4f7f\u7528\u6642\u306e\u6ce8\u610f\u70b9\u3068\u843d\u3068\u3057\u7a74<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<p>abs\u95a2\u6570\u4f7f\u7528\u6642\u306b\u6700\u3082\u6ce8\u610f\u3059\u3079\u304d\u554f\u984c\u306e\u4e00\u3064\u304c\u3001\u6574\u6570\u578b\u3067\u306e\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3067\u3059\u3002\u7279\u306b\u3001\u6700\u5c0f\u5024\u3092\u7d76\u5bfe\u5024\u306b\u5909\u63db\u3059\u308b\u969b\u306b\u554f\u984c\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;climits&gt;\n#include &lt;cstdlib&gt;\n\nint main() {\n    \/\/ \u5371\u967a\u306a\u30b1\u30fc\u30b9: INT_MIN\u306e\u7d76\u5bfe\u5024\u3092\u53d6\u308d\u3046\u3068\u3059\u308b\n    int dangerous = INT_MIN;  \/\/ -2147483648\n    int abs_result = std::abs(dangerous);\n\n    std::cout &lt;&lt; \"Original: \" &lt;&lt; dangerous &lt;&lt; std::endl;\n    std::cout &lt;&lt; \"Abs result: \" &lt;&lt; abs_result &lt;&lt; std::endl;  \/\/ \u672a\u5b9a\u7fa9\u52d5\u4f5c\uff01\n\n    \/\/ \u5b89\u5168\u306a\u5bfe\u51e6\u65b9\u6cd5\n    long long safe_value = static_cast&lt;long long&gt;(dangerous);\n    long long safe_result = std::abs(safe_value);\n\n    std::cout &lt;&lt; \"Safe result: \" &lt;&lt; safe_result &lt;&lt; std::endl;\n}<\/pre>\n\n\n\n<p>\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u9632\u6b62\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5927\u304d\u306a\u6570\u5024\u3092\u6271\u3046\u969b\u306f\u3001\u5341\u5206\u306a\u7bc4\u56f2\u3092\u6301\u3064\u578b\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u4e8b\u524d\u306b\u5024\u306e\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u3088\u308a\u5927\u304d\u306a\u578b\u306b\u30ad\u30e3\u30b9\u30c8<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">template&lt;typename T&gt;\nbool isAbsSafe(T value) {\n    if (std::is_signed&lt;T&gt;::value) {\n        return value != std::numeric_limits&lt;T&gt;::min();\n    }\n    return true;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3067\u306e\u7cbe\u5ea6\u306e\u554f\u984c<\/h3>\n\n\n\n<p>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u8a08\u7b97\u7cbe\u5ea6\u3068\u4e38\u3081\u8aa4\u5dee\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;iomanip&gt;\n\nint main() {\n    \/\/ \u7cbe\u5ea6\u306e\u554f\u984c\u3092\u793a\u3059\u4f8b\n    double small = 1e-10;\n    double smaller = -1e-10;\n\n    std::cout &lt;&lt; std::setprecision(12);\n    std::cout &lt;&lt; \"Original: \" &lt;&lt; small &lt;&lt; std::endl;\n    std::cout &lt;&lt; \"Abs: \" &lt;&lt; std::abs(small) &lt;&lt; std::endl;\n\n    \/\/ \u975e\u5e38\u306b\u5c0f\u3055\u3044\u5024\u3067\u306e\u6bd4\u8f03\n    if (std::abs(small - smaller) &lt; 1e-15) {\n        std::cout &lt;&lt; \"Values are effectively equal\" &lt;&lt; std::endl;\n    }\n\n    \/\/ \u63a8\u5968\u3055\u308c\u308b\u6bd4\u8f03\u65b9\u6cd5\n    const double epsilon = 1e-10;\n    bool areEqual = std::abs(small - smaller) &lt;= epsilon * std::abs(small);\n}<\/pre>\n\n\n\n<p>\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u4f7f\u7528\u6642\u306e\u63a8\u5968\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n<div id=\"id-b86ab03a-9ce3-4ff3-8906-b312e0c28a0c\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u72b6\u6cc1<\/th><th>\u63a8\u5968\u3055\u308c\u308b\u5bfe\u5fdc<\/th><\/tr><\/thead><tbody><tr><td>\u5024\u306e\u6bd4\u8f03<\/td><td>\u30a4\u30d7\u30b7\u30ed\u30f3\u3092\u4f7f\u7528\u3057\u305f\u76f8\u5bfe\u8aa4\u5dee\u306e\u6bd4\u8f03<\/td><\/tr><tr><td>\u7cbe\u5ea6\u304c\u91cd\u8981\u306a\u8a08\u7b97<\/td><td>long double\u306e\u4f7f\u7528\u3092\u691c\u8a0e<\/td><\/tr><tr><td>\u8aa4\u5dee\u306e\u84c4\u7a4d<\/td><td>\u8a08\u7b97\u9806\u5e8f\u306e\u6700\u9069\u5316<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u7570\u306a\u308b\u578b\u3067\u306e\u6697\u9ed9\u7684\u306a\u578b\u5909\u63db\u306e\u7f60<\/h3>\n\n\n\n<p>\u7570\u306a\u308b\u578b\u9593\u3067\u306e\u5909\u63db\u6642\u306b\u4e88\u671f\u305b\u306c\u52d5\u4f5c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cstdlib&gt;\n\nint main() {\n    \/\/ \u6697\u9ed9\u7684\u306a\u578b\u5909\u63db\u306e\u4f8b\n    short s = -42;\n    unsigned int u = 42;\n\n    \/\/ \u6ce8\u610f\u304c\u5fc5\u8981\u306a\u30b1\u30fc\u30b9\n    auto result1 = std::abs(s);  \/\/ short\u304b\u3089int\u306b\u5909\u63db\n    auto result2 = std::abs(u);  \/\/ unsigned int\u306b\u5bfe\u3059\u308babs\n\n    \/\/ \u3088\u308a\u5b89\u5168\u306a\u65b9\u6cd5\n    short s_result = static_cast&lt;short&gt;(std::abs(static_cast&lt;int&gt;(s)));\n\n    \/\/ \u578b\u5909\u63db\u3092\u907f\u3051\u308b\u305f\u3081\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u95a2\u6570\n    template&lt;typename T&gt;\n    T safeAbs(T value) {\n        static_assert(std::is_arithmetic&lt;T&gt;::value, \"Arithmetic type required.\");\n        if constexpr (std::is_unsigned&lt;T&gt;::value) {\n            return value;  \/\/ \u7b26\u53f7\u306a\u3057\u578b\u306f\u305d\u306e\u307e\u307e\u8fd4\u3059\n        } else {\n            return value &lt; 0 ? -value : value;\n        }\n    }\n}<\/pre>\n\n\n\n<p>\u578b\u5909\u63db\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6697\u9ed9\u7684\u306a\u578b\u5909\u63db\u3092\u907f\u3051\u3001\u660e\u793a\u7684\u306a\u30ad\u30e3\u30b9\u30c8\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>unsigned\u578b\u306b\u5bfe\u3059\u308babs\u306e\u4f7f\u7528\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u3066\u578b\u5b89\u5168\u306a\u5b9f\u88c5\u3092\u884c\u3046<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u554f\u984c\u70b9\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u5bfe\u51e6\u3059\u308b\u3053\u3068\u3067\u3001abs\u95a2\u6570\u3092\u5b89\u5168\u304b\u3064\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u3001\u5927\u898f\u6a21\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3084\u30e9\u30a4\u30d6\u30e9\u30ea\u958b\u767a\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u6ce8\u610f\u70b9\u3092\u8003\u616e\u3057\u305f\u30ed\u30d0\u30b9\u30c8\u306a\u5b9f\u88c5\u304c\u91cd\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">abs\u95a2\u6570\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u6570\u5024\u8a08\u7b97\u3067\u306e\u52b9\u679c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u6570\u5024\u8a08\u7b97\u306b\u304a\u3044\u3066\u3001abs\u95a2\u6570\u306f\u8aa4\u5dee\u8a08\u7b97\u3084\u53ce\u675f\u5224\u5b9a\u306a\u3069\u3001\u69d8\u3005\u306a\u5834\u9762\u3067\u6d3b\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n#include &lt;vector&gt;\n\n\/\/ \u30cb\u30e5\u30fc\u30c8\u30f3\u6cd5\u306b\u3088\u308b\u5e73\u65b9\u6839\u306e\u8a08\u7b97\u4f8b\ndouble sqrt_newton(double x, double epsilon = 1e-10) {\n    if (x &lt; 0) return std::nan(\"\");\n    if (x == 0) return 0;\n\n    double guess = x \/ 2.0;\n    while (std::abs(guess * guess - x) &gt; epsilon) {\n        guess = (guess + x \/ guess) \/ 2.0;\n    }\n    return guess;\n}\n\n\/\/ \u6570\u5024\u7a4d\u5206\uff08\u53f0\u5f62\u5247\uff09\u306e\u5b9f\u88c5\u4f8b\ndouble integrate_trapezoidal(double (*f)(double), double a, double b, int n) {\n    double h = (b - a) \/ n;\n    double sum = (f(a) + f(b)) \/ 2.0;\n\n    for (int i = 1; i &lt; n; i++) {\n        sum += f(a + i * h);\n    }\n\n    return h * sum;\n}\n\n\/\/ \u8aa4\u5dee\u8a55\u4fa1\u95a2\u6570\ndouble calculate_error(const std::vector&lt;double&gt;&amp; expected,\n                      const std::vector&lt;double&gt;&amp; actual) {\n    if (expected.size() != actual.size()) return std::nan(\"\");\n\n    double max_error = 0.0;\n    for (size_t i = 0; i &lt; expected.size(); ++i) {\n        double error = std::abs(expected[i] - actual[i]);\n        max_error = std::max(max_error, error);\n    }\n    return max_error;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u7269\u7406\u6f14\u7b97\u3067\u306e\u4f7f\u7528\u4f8b<\/h3>\n\n\n\n<p>\u7269\u7406\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001\u8ddd\u96e2\u8a08\u7b97\u3084\u885d\u7a81\u5224\u5b9a\u306a\u3069\u3067abs\u95a2\u6570\u304c\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n\nstruct Vector2D {\n    double x, y;\n\n    Vector2D(double x = 0, double y = 0) : x(x), y(y) {}\n\n    \/\/ \u30d9\u30af\u30c8\u30eb\u306e\u5927\u304d\u3055\u3092\u8a08\u7b97\n    double magnitude() const {\n        return std::sqrt(x * x + y * y);\n    }\n\n    \/\/ 2\u70b9\u9593\u306e\u8ddd\u96e2\u3092\u8a08\u7b97\n    static double distance(const Vector2D&amp; a, const Vector2D&amp; b) {\n        return std::sqrt(std::pow(a.x - b.x, 2) + std::pow(a.y - b.y, 2));\n    }\n};\n\n\/\/ \u885d\u7a81\u5224\u5b9a\u306e\u4f8b\nclass CollisionDetector {\npublic:\n    \/\/ \u5186\u3068\u5186\u306e\u885d\u7a81\u5224\u5b9a\n    static bool checkCollision(const Vector2D&amp; pos1, double radius1,\n                             const Vector2D&amp; pos2, double radius2) {\n        double distance = Vector2D::distance(pos1, pos2);\n        return distance &lt;= std::abs(radius1 + radius2);\n    }\n\n    \/\/ 1\u6b21\u5143\u3067\u306e\u5f3e\u6027\u885d\u7a81\u5f8c\u306e\u901f\u5ea6\u8a08\u7b97\n    static void calculateElasticCollision(double m1, double v1,\n                                        double m2, double v2,\n                                        double&amp; v1_new, double&amp; v2_new) {\n        v1_new = (m1 - m2) * v1 \/ (m1 + m2) + 2 * m2 * v2 \/ (m1 + m2);\n        v2_new = 2 * m1 * v1 \/ (m1 + m2) + (m2 - m1) * v2 \/ (m1 + m2);\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u30b2\u30fc\u30e0\u958b\u767a\u3067\u306e\u6d3b\u7528\u30b7\u30fc\u30f3<\/h3>\n\n\n\n<p>\u30b2\u30fc\u30e0\u958b\u767a\u3067\u306f\u3001\u79fb\u52d5\u51e6\u7406\u3084\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5236\u5fa1\u306a\u3069\u3067abs\u95a2\u6570\u304c\u6d3b\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;cmath&gt;\n\nclass GameEntity {\nprivate:\n    double x, y;\n    double speed;\n\npublic:\n    GameEntity(double x = 0, double y = 0, double speed = 1.0)\n        : x(x), y(y), speed(speed) {}\n\n    \/\/ \u76ee\u6a19\u4f4d\u7f6e\u3078\u306e\u6ed1\u3089\u304b\u306a\u79fb\u52d5\n    void moveTowards(double target_x, double target_y, double delta_time) {\n        double dx = target_x - x;\n        double dy = target_y - y;\n\n        \/\/ \u8ddd\u96e2\u306b\u57fa\u3065\u304f\u79fb\u52d5\u901f\u5ea6\u306e\u8abf\u6574\n        double distance = std::sqrt(dx * dx + dy * dy);\n        if (distance &gt; 0) {\n            double move_x = (dx \/ distance) * speed * delta_time;\n            double move_y = (dy \/ distance) * speed * delta_time;\n\n            \/\/ \u76ee\u6a19\u3092\u8d85\u3048\u306a\u3044\u3088\u3046\u306b\u79fb\u52d5\u91cf\u3092\u5236\u9650\n            if (std::abs(move_x) &gt; std::abs(dx)) move_x = dx;\n            if (std::abs(move_y) &gt; std::abs(dy)) move_y = dy;\n\n            x += move_x;\n            y += move_y;\n        }\n    }\n\n    \/\/ \u30ab\u30e1\u30e9\u306e\u8ffd\u5f93\u51e6\u7406\n    static double calculateCameraOffset(double player_pos, double camera_pos,\n                                      double dead_zone, double max_speed) {\n        double delta = player_pos - camera_pos;\n        if (std::abs(delta) &lt;= dead_zone) return 0.0;\n\n        double direction = delta &gt; 0 ? 1.0 : -1.0;\n        double speed = std::min(std::abs(delta) - dead_zone, max_speed);\n        return speed * direction;\n    }\n\n    \/\/ \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u88dc\u9593\n    static double lerp(double start, double end, double t) {\n        return start + (end - start) * std::max(0.0, std::min(1.0, t));\n    }\n};<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001abs\u95a2\u6570\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u5b9f\u969b\u306e\u958b\u767a\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u57fa\u306b\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5408\u308f\u305b\u3066\u9069\u5207\u306b\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u307e\u305f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u91cd\u8981\u306a\u5834\u9762\u3067\u306f\u3001abs\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u983b\u5ea6\u306b\u3082\u6ce8\u610f\u3092\u6255\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">abs\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u6700\u9069\u5316\u3068\u6761\u4ef6\u5206\u5c90<\/h3>\n\n\n\n<p>\u30b3\u30f3\u30d1\u30a4\u30e9\u306f abs \u95a2\u6570\u306b\u5bfe\u3057\u3066\u69d8\u3005\u306a\u6700\u9069\u5316\u3092\u9069\u7528\u3057\u307e\u3059\u3002\u7279\u306b\u3001\u6761\u4ef6\u5206\u5c90\u306e\u524a\u6e1b\u306f\u91cd\u8981\u306a\u6700\u9069\u5316\u306e\u4e00\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;iostream&gt;\n#include &lt;chrono&gt;\n#include &lt;vector&gt;\n#include &lt;cmath&gt;\n\n\/\/ \u901a\u5e38\u306e\u5b9f\u88c5\uff08\u6761\u4ef6\u5206\u5c90\u3042\u308a\uff09\ntemplate&lt;typename T&gt;\nT abs_branch(T x) {\n    return x &lt; 0 ? -x : x;\n}\n\n\/\/ \u6761\u4ef6\u5206\u5c90\u3092\u907f\u3051\u305f\u5b9f\u88c5\ntemplate&lt;typename T&gt;\nT abs_branchless(T x) {\n    T mask = x &gt;&gt; (sizeof(T) * 8 - 1);  \/\/ \u7b26\u53f7\u30d3\u30c3\u30c8\u3092\u5168\u30d3\u30c3\u30c8\u306b\u62e1\u5f35\n    return (x + mask) ^ mask;\n}\n\n\/\/ \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7528\u95a2\u6570\ntemplate&lt;typename T, typename Func&gt;\ndouble benchmark_abs(Func abs_func, const std::vector&lt;T&gt;&amp; data) {\n    auto start = std::chrono::high_resolution_clock::now();\n    volatile T sum = 0;  \/\/ \u6700\u9069\u5316\u3092\u9632\u3050\u305f\u3081volatile\u3092\u4f7f\u7528\n\n    for (const auto&amp; x : data) {\n        sum += abs_func(x);\n    }\n\n    auto end = std::chrono::high_resolution_clock::now();\n    return std::chrono::duration&lt;double&gt;(end - start).count();\n}\n\nint main() {\n    \/\/ \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u751f\u6210\n    std::vector&lt;int&gt; test_data(1000000);\n    for (size_t i = 0; i &lt; test_data.size(); ++i) {\n        test_data[i] = static_cast&lt;int&gt;(i) - 500000;\n    }\n\n    \/\/ \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u5b9f\u884c\n    double time_branch = benchmark_abs(abs_branch&lt;int&gt;, test_data);\n    double time_branchless = benchmark_abs(abs_branchless&lt;int&gt;, test_data);\n\n    std::cout &lt;&lt; \"Branch version: \" &lt;&lt; time_branch &lt;&lt; \" seconds\\n\";\n    std::cout &lt;&lt; \"Branchless version: \" &lt;&lt; time_branchless &lt;&lt; \" seconds\\n\";\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u7248abs\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u578b\u306b\u4f9d\u5b58\u3057\u306a\u3044\u52b9\u7387\u7684\u306aabs\u5b9f\u88c5\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;type_traits&gt;\n\n\/\/ \u6c4e\u7528\u7684\u306aabs\u5b9f\u88c5\ntemplate&lt;typename T&gt;\nclass AbsHelper {\n    static_assert(std::is_arithmetic&lt;T&gt;::value, \"Arithmetic type required\");\n\npublic:\n    static T abs(T x) {\n        if constexpr (std::is_unsigned&lt;T&gt;::value) {\n            return x;  \/\/ \u7b26\u53f7\u306a\u3057\u578b\u306f\u305d\u306e\u307e\u307e\u8fd4\u3059\n        } else if constexpr (std::is_floating_point&lt;T&gt;::value) {\n            \/\/ \u6d6e\u52d5\u5c0f\u6570\u70b9\u7528\u306e\u5b9f\u88c5\n            union {\n                T f;\n                typename std::conditional&lt;sizeof(T) == 8,\n                    uint64_t, uint32_t&gt;::type i;\n            } u{x};\n            u.i &amp;= ~(static_cast&lt;decltype(u.i)&gt;(1) &lt;&lt;\n                    (sizeof(T) * 8 - 1));\n            return u.f;\n        } else {\n            \/\/ \u6574\u6570\u578b\u7528\u306e\u5b9f\u88c5\n            T mask = x &gt;&gt; (sizeof(T) * 8 - 1);\n            return (x + mask) ^ mask;\n        }\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\ntemplate&lt;typename T&gt;\nT optimized_abs(T x) {\n    return AbsHelper&lt;T&gt;::abs(x);\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">SIMD\u547d\u4ee4\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u901f\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>SIMD\u547d\u4ee4\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u6570\u306e\u5024\u3092\u540c\u6642\u306b\u51e6\u7406\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;immintrin.h&gt;\n\n\/\/ SSE2\u3092\u4f7f\u7528\u3057\u305ffloat\u914d\u5217\u306e\u7d76\u5bfe\u5024\u8a08\u7b97\nvoid abs_array_sse(float* dst, const float* src, size_t count) {\n    constexpr size_t values_per_vector = 4;  \/\/ SSE\u306f4\u3064\u306efloat\u3092\u540c\u6642\u51e6\u7406\n\n    \/\/ \u30e1\u30a4\u30f3\u30eb\u30fc\u30d7\uff08\u30d9\u30af\u30c8\u30eb\u51e6\u7406\uff09\n    size_t vector_count = count \/ values_per_vector;\n    for (size_t i = 0; i &lt; vector_count; ++i) {\n        __m128 vec = _mm_load_ps(src + i * values_per_vector);\n        vec = _mm_andnot_ps(_mm_set1_ps(-0.0f), vec);  \/\/ \u7d76\u5bfe\u5024\u8a08\u7b97\n        _mm_store_ps(dst + i * values_per_vector, vec);\n    }\n\n    \/\/ \u6b8b\u308a\u306e\u8981\u7d20\u3092\u51e6\u7406\n    size_t remaining_start = vector_count * values_per_vector;\n    for (size_t i = remaining_start; i &lt; count; ++i) {\n        dst[i] = std::abs(src[i]);\n    }\n}\n\n\/\/ AVX2\u3092\u4f7f\u7528\u3057\u305fdouble\u914d\u5217\u306e\u7d76\u5bfe\u5024\u8a08\u7b97\nvoid abs_array_avx(double* dst, const double* src, size_t count) {\n    constexpr size_t values_per_vector = 4;  \/\/ AVX\u306f4\u3064\u306edouble\u3092\u540c\u6642\u51e6\u7406\n\n    \/\/ \u30e1\u30a4\u30f3\u30eb\u30fc\u30d7\uff08\u30d9\u30af\u30c8\u30eb\u51e6\u7406\uff09\n    size_t vector_count = count \/ values_per_vector;\n    for (size_t i = 0; i &lt; vector_count; ++i) {\n        __m256d vec = _mm256_load_pd(src + i * values_per_vector);\n        vec = _mm256_andnot_pd(_mm256_set1_pd(-0.0), vec);  \/\/ \u7d76\u5bfe\u5024\u8a08\u7b97\n        _mm256_store_pd(dst + i * values_per_vector, vec);\n    }\n\n    \/\/ \u6b8b\u308a\u306e\u8981\u7d20\u3092\u51e6\u7406\n    size_t remaining_start = vector_count * values_per_vector;\n    for (size_t i = remaining_start; i &lt; count; ++i) {\n        dst[i] = std::abs(src[i]);\n    }\n}\n\n\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\nvoid compare_performance() {\n    constexpr size_t size = 1000000;\n    std::vector&lt;float&gt; src(size);\n    std::vector&lt;float&gt; dst_sse(size);\n    std::vector&lt;float&gt; dst_std(size);\n\n    \/\/ \u30c7\u30fc\u30bf\u521d\u671f\u5316\n    for (size_t i = 0; i &lt; size; ++i) {\n        src[i] = static_cast&lt;float&gt;(i) - (size \/ 2);\n    }\n\n    \/\/ SIMD\u7248\u306e\u8a08\u6e2c\n    auto start_sse = std::chrono::high_resolution_clock::now();\n    abs_array_sse(dst_sse.data(), src.data(), size);\n    auto end_sse = std::chrono::high_resolution_clock::now();\n\n    \/\/ \u6a19\u6e96\u7248\u306e\u8a08\u6e2c\n    auto start_std = std::chrono::high_resolution_clock::now();\n    for (size_t i = 0; i &lt; size; ++i) {\n        dst_std[i] = std::abs(src[i]);\n    }\n    auto end_std = std::chrono::high_resolution_clock::now();\n\n    \/\/ \u7d50\u679c\u51fa\u529b\n    auto sse_time = std::chrono::duration&lt;double&gt;(end_sse - start_sse).count();\n    auto std_time = std::chrono::duration&lt;double&gt;(end_std - start_std).count();\n\n    std::cout &lt;&lt; \"SSE version: \" &lt;&lt; sse_time &lt;&lt; \" seconds\\n\";\n    std::cout &lt;&lt; \"Standard version: \" &lt;&lt; std_time &lt;&lt; \" seconds\\n\";\n    std::cout &lt;&lt; \"Speedup: \" &lt;&lt; std_time \/ sse_time &lt;&lt; \"x\\n\";\n}<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u3092\u884c\u3046\u969b\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u306b\u3088\u308b\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306e\u7279\u5b9a<\/li>\n\n\n\n<li>\u4f7f\u7528\u74b0\u5883\u306b\u5fdc\u3058\u305f\u6700\u9069\u306a\u5b9f\u88c5\u306e\u9078\u629e<\/li>\n\n\n\n<li>\u30b3\u30f3\u30d1\u30a4\u30e9\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u9069\u5207\u306a\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3068\u547d\u4ee4\u30bb\u30c3\u30c8\u306e\u8003\u616e<\/li>\n<\/ol>\n\n\n<div id=\"id-e97d6272-ad1e-4c56-984d-4baa76f2069a\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6700\u9069\u5316\u624b\u6cd5<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u30c7\u30e1\u30ea\u30c3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u6761\u4ef6\u5206\u5c90\u9664\u53bb<\/td><td>\u5206\u5c90\u4e88\u6e2c\u30df\u30b9\u306e\u56de\u907f<\/td><td>\u30b3\u30fc\u30c9\u53ef\u8aad\u6027\u306e\u4f4e\u4e0b<\/td><\/tr><tr><td>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5b9f\u88c5<\/td><td>\u578b\u5b89\u5168\u6027\u3068\u6c4e\u7528\u6027\u306e\u5411\u4e0a<\/td><td>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u9593\u306e\u5897\u52a0<\/td><\/tr><tr><td>SIMD\u547d\u4ee4<\/td><td>\u5927\u5e45\u306a\u6027\u80fd\u5411\u4e0a<\/td><td>\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u4f9d\u5b58<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u6280\u8853\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001abs\u95a2\u6570\u306e\u5b9f\u884c\u6027\u80fd\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5b9f\u969b\u306e\u9069\u7528\u306b\u306f\u614e\u91cd\u306a\u691c\u8a0e\u3068\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">C++17\u4ee5\u964d\u3067\u306eabs\u95a2\u6570\u306e\u65b0\u6a5f\u80fd<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">constexpr\u5bfe\u5fdc\u306b\u3088\u308b\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u8a08\u7b97<\/h3>\n\n\n\n<p>C++17\u4ee5\u964d\u3001abs\u95a2\u6570\u306fconstexpr\u306b\u5bfe\u5fdc\u3057\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u8a08\u7b97\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;type_traits&gt;\n\n\/\/ constexpr\u3067\u306eabs\u95a2\u6570\u306e\u4f7f\u7528\u4f8b\nconstexpr int compile_time_abs(int x) {\n    return std::abs(x);  \/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a08\u7b97\u3055\u308c\u308b\n}\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u5b9a\u6570\u5f0f\u3067\u306e\u4f7f\u7528\nconstexpr int value = compile_time_abs(-42);\n\n\/\/ constexpr\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u95a2\u6570\u3067\u306e\u6d3b\u7528\ntemplate&lt;typename T&gt;\nconstexpr T calculate_distance(T x1, T x2) {\n    static_assert(std::is_arithmetic_v&lt;T&gt;, \"Arithmetic type required\");\n    return std::abs(x2 - x1);\n}\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\nstatic_assert(compile_time_abs(-100) == 100, \"Abs function error\");\nstatic_assert(calculate_distance(5.0, -3.0) == 8.0, \"Distance calculation error\");\n\n\/\/ \u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\ntemplate&lt;typename T&gt;\nclass NumericRange {\n    T min_;\n    T max_;\n\npublic:\n    constexpr NumericRange(T min, T max) : min_(min), max_(max) {\n        if (max &lt; min) {\n            std::swap(min_, max_);\n        }\n    }\n\n    \/\/ \u7bc4\u56f2\u306e\u30b5\u30a4\u30ba\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u8a08\u7b97\n    constexpr T size() const {\n        return std::abs(max_ - min_);\n    }\n\n    \/\/ \u5024\u304c\u7bc4\u56f2\u5185\u304b\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30c1\u30a7\u30c3\u30af\n    constexpr bool contains(T value) const {\n        return value &gt;= min_ &amp;&amp; value &lt;= max_;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u306e\u7d71\u5408<\/h3>\n\n\n\n<p>C++17\u4ee5\u964d\u3001abs\u95a2\u6570\u306f\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u4ed6\u306e\u6a5f\u80fd\u3068\u3088\u308a\u5bc6\u63a5\u306b\u7d71\u5408\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;numeric&gt;\n#include &lt;algorithm&gt;\n#include &lt;vector&gt;\n#include &lt;execution&gt;\n\n\/\/ \u4e26\u5217\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3068\u306e\u7d71\u5408\u4f8b\nstd::vector&lt;double&gt; parallel_abs_transform(const std::vector&lt;double&gt;&amp; input) {\n    std::vector&lt;double&gt; result(input.size());\n\n    \/\/ \u4e26\u5217\u5b9f\u884c\u30dd\u30ea\u30b7\u30fc\u3092\u4f7f\u7528\u3057\u305f\u5909\u63db\n    std::transform(\n        std::execution::par_unseq,  \/\/ \u4e26\u5217\u30fb\u30d9\u30af\u30c8\u30eb\u5316\u5b9f\u884c\n        input.begin(), input.end(),\n        result.begin(),\n        [](double x) { return std::abs(x); }\n    );\n\n    return result;\n}\n\n\/\/ \u6570\u5024\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3068\u306e\u7d71\u5408\ntemplate&lt;typename Container&gt;\nauto calculate_absolute_metrics(const Container&amp; data) {\n    struct Metrics {\n        typename Container::value_type \n            sum_abs,      \/\/ \u7d76\u5bfe\u5024\u306e\u5408\u8a08\n            max_abs,      \/\/ \u7d76\u5bfe\u5024\u306e\u6700\u5927\n            mean_abs;     \/\/ \u7d76\u5bfe\u5024\u306e\u5e73\u5747\n    };\n\n    Metrics result{};\n\n    \/\/ \u7d76\u5bfe\u5024\u306e\u5408\u8a08\u3092\u8a08\u7b97\n    result.sum_abs = std::transform_reduce(\n        std::execution::par,\n        data.begin(), data.end(),\n        0.0,\n        std::plus&lt;&gt;(),\n        [](auto x) { return std::abs(x); }\n    );\n\n    \/\/ \u7d76\u5bfe\u5024\u306e\u6700\u5927\u3092\u8a08\u7b97\n    result.max_abs = std::transform_reduce(\n        std::execution::par,\n        data.begin(), data.end(),\n        0.0,\n        [](auto a, auto b) { return std::max(a, b); },\n        [](auto x) { return std::abs(x); }\n    );\n\n    \/\/ \u7d76\u5bfe\u5024\u306e\u5e73\u5747\u3092\u8a08\u7b97\n    result.mean_abs = result.sum_abs \/ data.size();\n\n    return result;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u65b0\u3057\u3044\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u306e\u8ffd\u52a0<\/h3>\n\n\n\n<p>C++17\u4ee5\u964d\u3001\u65b0\u3057\u3044\u6570\u5024\u578b\u306b\u5bfe\u3059\u308babs\u95a2\u6570\u306e\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;cmath&gt;\n#include &lt;complex&gt;\n#include &lt;chrono&gt;\n\n\/\/ \u6642\u9593\u9593\u9694\u306b\u5bfe\u3059\u308babs\nvoid demonstrate_chrono_abs() {\n    using namespace std::chrono;\n\n    \/\/ \u6642\u9593\u9593\u9694\u306e\u7d76\u5bfe\u5024\n    constexpr auto duration1 = hours(5);\n    constexpr auto duration2 = hours(-3);\n\n    constexpr auto abs_duration = abs(duration2);  \/\/ 3\u6642\u9593\n    static_assert(abs_duration == hours(3));\n}\n\n\/\/ \u8907\u7d20\u6570\u306b\u5bfe\u3059\u308b\u62e1\u5f35\u30b5\u30dd\u30fc\u30c8\ntemplate&lt;typename T&gt;\nclass ComplexMetrics {\npublic:\n    static T magnitude(const std::complex&lt;T&gt;&amp; z) {\n        return std::abs(z);  \/\/ \u8907\u7d20\u6570\u306e\u5927\u304d\u3055\n    }\n\n    static T phase(const std::complex&lt;T&gt;&amp; z) {\n        return std::arg(z);  \/\/ \u8907\u7d20\u6570\u306e\u504f\u89d2\n    }\n\n    \/\/ \u8907\u7d20\u6570\u306e\u6975\u5ea7\u6a19\u8868\u73fe\n    static std::pair&lt;T, T&gt; polar_form(const std::complex&lt;T&gt;&amp; z) {\n        return {magnitude(z), phase(z)};\n    }\n};\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u578b\u3067\u306e\u4f7f\u7528\u4f8b\ntemplate&lt;typename T&gt;\nclass Vector3D {\n    T x_, y_, z_;\n\npublic:\n    constexpr Vector3D(T x, T y, T z) : x_(x), y_(y), z_(z) {}\n\n    \/\/ \u30d9\u30af\u30c8\u30eb\u306e\u5927\u304d\u3055\u3092\u8a08\u7b97\n    constexpr T magnitude() const {\n        return std::sqrt(std::abs(x_ * x_) + \n                        std::abs(y_ * y_) + \n                        std::abs(z_ * z_));\n    }\n\n    \/\/ \u8981\u7d20\u3054\u3068\u306e\u7d76\u5bfe\u5024\u3092\u8a08\u7b97\n    constexpr Vector3D abs() const {\n        return Vector3D(std::abs(x_), \n                       std::abs(y_), \n                       std::abs(z_));\n    }\n};<\/pre>\n\n\n\n<p>C++17\u4ee5\u964d\u306e\u4e3b\u306a\u6539\u5584\u70b9\uff1a<\/p>\n\n\n<div id=\"id-03ad2580-ee9d-4bcf-b0db-44d405dc46b9\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6a5f\u80fd<\/th><th>\u8aac\u660e<\/th><th>\u5229\u70b9<\/th><\/tr><\/thead><tbody><tr><td>constexpr\u5bfe\u5fdc<\/td><td>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u8a08\u7b97\u304c\u53ef\u80fd\u306b<\/td><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30c1\u30a7\u30c3\u30af<\/td><\/tr><tr><td>\u4e26\u5217\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u7d71\u5408<\/td><td>\u4e26\u5217\u5b9f\u884c\u3068\u306e\u9023\u643a<\/td><td>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u9ad8\u901f\u51e6\u7406<\/td><\/tr><tr><td>\u65b0\u578b\u3068\u306e\u7d71\u5408<\/td><td>\u6642\u9593\u578b\u306a\u3069\u3078\u306e\u5bfe\u5fdc<\/td><td>\u578b\u5b89\u5168\u306a\u51e6\u7406\u306e\u5b9f\u73fe<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u65b0\u6a5f\u80fd\u306b\u3088\u308a\u3001abs\u95a2\u6570\u306f\u3088\u308a\u67d4\u8edf\u3067\u52b9\u7387\u7684\u306a\u4f7f\u7528\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u7279\u306b\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u8a08\u7b97\u3068\u4e26\u5217\u51e6\u7406\u306e\u5bfe\u5fdc\u306f\u3001\u73fe\u4ee3\u306eC++\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u610f\u5473\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":{"0":"post-1991","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-cpp","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1991"}],"version-history":[{"count":2,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1991\/revisions"}],"predecessor-version":[{"id":2021,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1991\/revisions\/2021"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}