{"id":139,"date":"2016-11-12T15:03:41","date_gmt":"2016-11-12T07:03:41","guid":{"rendered":"http:\/\/zsaber.com\/blog\/?p=139"},"modified":"2019-08-26T15:49:31","modified_gmt":"2019-08-26T07:49:31","slug":"c-%e5%af%b9%e5%a4%9a%e4%b8%aa%e7%b1%bb%e5%9e%8b%e6%a8%a1%e6%9d%bf%e7%89%b9%e5%8c%96%e9%82%a3%e4%ba%9b%e4%ba%8b%e5%84%bf","status":"publish","type":"post","link":"http:\/\/zsaber.com\/blog\/p\/139","title":{"rendered":"C++ \u5bf9\u591a\u4e2a\u7c7b\u578b\u6a21\u677f\u7279\u5316\u90a3\u4e9b\u4e8b\u513f"},"content":{"rendered":"<h1>\u524d\u8a00<\/h1>\n<p>\u6a21\u677f\u7279\u5316\u5927\u5bb6\u90fd\u5f88\u719f\u4e86<\/p>\n<pre><code class=\"language-cpp\">template&lt;typename T&gt;\nclass Holder;\n\ntemplate&lt;&gt;\nclass Holder&lt;TypeA&gt; {};\n\ntemplate&lt;&gt;\nclass Holder&lt;TypeB&gt; {};<\/code><\/pre>\n<p>\u4e0d\u8fc7\u4e0d\u77e5\u5404\u4f4d\u662f\u5426\u9047\u5230\u8fc7\u8fd9\u79cd\u5c34\u5c2c\u60c5\u51b5<\/p>\n<pre><code class=\"language-cpp\">typedef int TypeA;\ntypedef int TypeB;<\/code><\/pre>\n<p>\u770b\u7740\u5f88\u50bb, \u4f46\u662f\u5728 C\u8279 \u4e16\u754c\u91cc\u8fd8\u662f\u5f88\u5e38\u89c1\u7684, \u6bd4\u5982\u5bf9\u4e0d\u540c\u5e73\u53f0\u9002\u914d\u5404\u79cd int \u7c7b\u578b\u7684\u65f6\u5019,<br \/>\n\u867d\u8bf4\u6709 stdint, \u4f46\u8981\u9002\u914d\u73b0\u6709\u4ee3\u7801\u7684\u65f6\u5019\u8fd8\u662f\u96be\u4ee5\u907f\u5f00\u8fd9\u4e9b\u95ee\u9898<\/p>\n<p>\u4e8e\u662f\u5f15\u51fa\u4e86\u672c\u6587\u7684\u4e3b\u9898: \u5982\u4f55\u5bf9\u4e00\u5806\u672a\u77e5\u662f\u5426\u76f8\u540c\u7684\u7c7b\u578b\u505a\u6a21\u677f\u7279\u5316<\/p>\n<hr \/>\n<h1>strong typedef \u6cd5<\/h1>\n<p>\u8fd9\u73a9\u610f\u513f\u5728 boost \u91cc\u9762\u4e5f\u6709, \u53eb BOOST_STRONG_TYPEDEF<\/p>\n<p>\u5927\u81f4\u539f\u7406\u662f\u751f\u6210\u4e2a\u65b0\u7c7b\u578b\u505a\u5305\u88c5<\/p>\n<pre><code class=\"language-cpp\">class WrapperA\n{\npublic:\n    explicit WrapperA(const int) {...}\n    WrapperA(WrapperA const &amp;) {...}\n    WrapperA(void) {...}\n    WrapperA &amp;operator = (const int) {...}\n    WrapperA &amp;operator = (WrapperA const &amp;) {...}\n    operator const int &amp;() const {...}\n    operator int &amp;() {...}\n    bool operator == (WrapperA const &amp;) const {...}\n    bool operator != (WrapperA const &amp;) const {...}\n    bool operator &lt; (WrapperA const &amp;) const {...}\n    bool operator &lt;= (WrapperA const &amp;) const {...}\n    bool operator &gt; (WrapperA const &amp;) const {...}\n    bool operator &gt;= (WrapperA const &amp;) const {...}\nprivate:\n    int v;\n};\n\n\/\/ WrapperB \u540c\u7406, \u5b8c\u5168\u91cd\u65b0\u5b9a\u4e49\u4e00\u4efd<\/code><\/pre>\n<p>\u4e0d\u8fc7\u8fd9\u73a9\u610f\u513f\u4e5f\u4e0d\u5c11\u7f3a\u70b9:<\/p>\n<ul>\n<li>\u7565\u5fae\u6709\u70b9\u6027\u80fd\u635f\u5931, \u867d\u7136\u5927\u591a\u6570\u573a\u666f\u53ef\u4ee5\u5ffd\u7565<\/li>\n<li>\u5bf9\u4e8e\u6a21\u677f\u7279\u5316\u6765\u8bf4, \u5b9e\u9645\u4e0a WrapperA \u548c int \u8fd8\u662f\u4e0d\u4e00\u6837\u7684\u7c7b\u578b,<br \/>\n\u4f60\u5f97\u786e\u4fdd\u4f60\u7684\u5e94\u7528\u4ee3\u7801\u5b8c\u5168\u4f7f\u7528\u4f60\u7684 wrapper \u7c7b\u578b<\/li>\n<li>\n<p>\u5bf9\u4e8e\u9700\u8981\u7b97\u672f\u8fd0\u7b97\u7684\u57fa\u672c\u7c7b\u578b\u6765\u8bf4, \u8fd8\u6709\u66f4\u591a\u7684\u9ebb\u70e6\u4e8b:<\/p>\n<ul>\n<li>\n<p>\u4f60\u5f97\u91cd\u8f7d\u5404\u79cd operator \u7528\u6765\u652f\u6301\u7b97\u6570\u8fd0\u7b97, \u5b8c\u6574\u7684\u5927\u7ea6\u5f97\u6709 20 \u4e2a\u5de6\u53f3,<br \/>\n\u800c\u4e14\u8fd8\u6709\u5404\u79cd\u7c7b\u578b\u8fd0\u7b97\u540e\u662f\u9700\u8981\u8fd4\u56de\u65b0\u7c7b\u578b\u7684 (\u6bd4\u5982 long \u4e0e float \u76f8\u4e58\u7ed3\u679c\u662f double)<\/p>\n<\/li>\n<li>\n<p>\u4f60\u5f88\u5356\u529b\u7684\u91cd\u5199\u5b8c\u4e86\u6240\u6709 operator, \u4e0d\u51fa\u610f\u5916\u8fd8\u4f1a\u78b0\u5230\u5404\u79cd ambiguous<\/p>\n<\/li>\n<li>\n<p>\u6700\u7ec8, \u4f60\u53d1\u73b0\u4f7f\u7528 explicit \u6784\u9020\u51fd\u6570\u53ef\u4ee5\u907f\u514d\u8fd9\u79cd\u60c5\u51b5, \u4f46\u662f, \u53c8\u53d1\u73b0\u4ee5\u4e0b\u6700\u57fa\u672c\u7684\u521d\u59cb\u5316\u90fd\u4e0d\u597d\u7528\u4e86:<\/p>\n<pre><code class=\"language-cpp\">BOOST_STRONG_TYPEDEF(unsigned int, my_uint)\nmy_uint n = 0;\n\/\/ \u8fd9\u91cc 0 \u9ed8\u8ba4\u662f int, \u7136\u800c\u7531\u4e8e explicit \u6784\u9020\u51fd\u6570, \u65e0\u6cd5\u9690\u5f0f\u8f6c\u6362\n\nvoid func(my_uint n) {...}\nfunc(0); \/\/ \u540c\u7406, \u8fd9\u8fb9\u4e5f\u65e0\u6cd5\u9690\u5f0f\u8f6c\u6362, \u5fc5\u987b\u624b\u52a8 func((my_uint)0);<\/code><\/pre>\n<\/li>\n<li>\n<p>\u603b\u4e4b, \u8fd9\u73a9\u610f\u513f\u4e0d\u7ba1\u600e\u6837\u90fd\u65e0\u6cd5\u5b8c\u7f8e\u7684\u5bf9\u5e94\u7528\u5c42\u900f\u660e<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1>\u6a21\u677f\u9012\u5f52\u6cd5<\/h1>\n<p>\u8fd9\u73a9\u610f\u513f\u662f\u6700\u8fd1\u8111\u6d1e\u51fa\u6765\u7684\u7ed3\u679c, \u4e0d\u4e00\u5b9a\u662f\u6700\u597d\u65b9\u6848, but it works <code>\u256e(\u256f\u25bd\u2570)\u256d<\/code><\/p>\n<hr \/>\n<p>\u9996\u5148, \u6211\u4eec\u5148\u6765\u719f\u6089\u4e0b\u4e0d\u662f\u5f88\u5e38\u89c1\u7684\u6a21\u677f\u9012\u5f52:<\/p>\n<pre><code class=\"language-cpp\">template&lt;int N&gt;\nclass Holder\n{\npublic:\n    enum {value = Holder&lt;N - 1&gt;::value + 1};\n};\ntemplate&lt;&gt;\nclass Holder&lt;0&gt;\n{\npublic:\n    enum {value = 0};\n};\n\nint result = Holder&lt;2&gt;::value;<\/code><\/pre>\n<p>\u4e0a\u8ff0 result \u7684\u7ed3\u679c\u662f 2, \u5b9e\u9645\u4e0a, \u5f15\u7528 <code>Holder&lt;2&gt;<\/code> \u65f6\u4f1a\u56e0\u4e3a <code>Holder&lt;N - 1&gt;<\/code> \u800c\u4f9d\u6b21\u9012\u5f52\u751f\u6210<br \/>\n<code>Holder&lt;2&gt;<\/code> <code>Holder&lt;1&gt;<\/code> <code>Holder&lt;0&gt;<\/code>, \u5e76\u6700\u7ec8\u505c\u6b62\u4e8e <code>Holder&lt;0&gt;<\/code> \u7684\u7279\u5316\u7248\u672c<\/p>\n<p>\u6a21\u677f\u9012\u5f52\u5168\u90e8\u5728\u7f16\u8bd1\u671f\u5b8c\u6210, \u56e0\u6b64\u6700\u7ec8\u503c\u672c\u8eab\u53ef\u4ee5\u4f5c\u4e3a\u7f16\u8bd1\u671f\u53c2\u6570\u6765\u53c2\u4e0e\u66f4\u590d\u6742\u7684\u6a21\u677f\u63a8\u5bfc (\u63a8\u5012\u4ec0\u4e48\u7684\u6700\u8ba8\u538c\u4e86 @w@)<\/p>\n<hr \/>\n<p>\u8bb2\u5230\u8fd9, \u5e94\u8be5\u77e5\u9053\u63a5\u4e0b\u6765\u7684\u5957\u8def\u4e86\u5427? \u7528\u6a21\u677f\u9012\u5f52\u914d\u5408 int \u7c7b\u578b\u6a21\u677f\u53c2\u6570\u7279\u5316, \u6765\u9488\u5bf9\u76f8\u540c\u7c7b\u578b\u63a8\u5bfc\u51fa\u4e0d\u540c\u6a21\u677f<\/p>\n<p>\u4e0d\u8fc7, \u8fd8\u5269\u4e2a\u95ee\u9898, int \u7c7b\u578b\u7684\u7279\u5316\u503c\u54ea\u6765? \u624b\u52a8\u6572\u53ef\u4e0d\u9760\u8c31, \u6bd5\u7adf\u4f60\u5e76\u4e0d\u77e5\u9053\u5230\u5e95\u5728\u4ec0\u4e48\u65f6\u5019\u9700\u8981\u7279\u5316<\/p>\n<p>\u4e8e\u662f, \u8fd8\u5f97\u5f15\u5165\u4e2a\u9759\u6001\u8ba1\u6570, \u5728\u7f16\u8bd1\u671f\u505a\u4e00\u4e2a\u81ea\u589e\u7684\u6570\u503c<\/p>\n<p>\u8fd9\u73a9\u610f\u513f\u6709\u5f88\u591a\u7684\u5b9e\u73b0\u65b9\u5f0f, \u6709\u7684\u7f16\u8bd1\u5668\u81ea\u5df1\u4e5f\u6709\u63d0\u4f9b, \u8fd9\u91cc\u63d0\u4f9b\u4e00\u4e2a\u53ef\u4ee5\u8de8\u5e73\u53f0\u7684\u7248\u672c (\u51fa\u5904\u627e\u4e0d\u7740\u4e86, \u6c42\u6307\u6b63)<\/p>\n<pre><code class=\"language-cpp\">template&lt;int N&gt;\nclass _Counter\n{\npublic:\n    char data[N + 1];\n};\ntemplate&lt;typename T_Type, int N, int Acc&gt;\n_Counter&lt;Acc&gt; _CounterSeen(T_Type, _Counter&lt;N&gt;, _Counter&lt;Acc&gt;);\ntemplate&lt;typename T_Type&gt;\nclass _CounterWrap\n{\npublic:\n    static T_Type value(void);\n};\n#define CounterGet(...) \\\n    (sizeof _CounterSeen(_CounterWrap&lt;__VA_ARGS__&gt;::value(), _Counter&lt;1&gt;(), _Counter&lt; \\\n    (sizeof _CounterSeen(_CounterWrap&lt;__VA_ARGS__&gt;::value(), _Counter&lt;2&gt;(), _Counter&lt; \\\n    (sizeof _CounterSeen(_CounterWrap&lt;__VA_ARGS__&gt;::value(), _Counter&lt;4&gt;(), _Counter&lt; \\\n    (sizeof _CounterSeen(_CounterWrap&lt;__VA_ARGS__&gt;::value(), _Counter&lt;8&gt;(), _Counter&lt; \\\n    (sizeof _CounterSeen(_CounterWrap&lt;__VA_ARGS__&gt;::value(), _Counter&lt;16&gt;(), _Counter&lt; 0 \\\n         &gt;()).data - 1) \\\n         &gt;()).data - 1) \\\n         &gt;()).data - 1) \\\n         &gt;()).data - 1) \\\n         &gt;()).data - 1) \/\/ \u9700\u8981\u66f4\u591a\u7684\u8bdd, \u8fd9\u91cc\u53ef\u4ee5\u7ee7\u7eed\u6dfb\u52a0\n#define CounterInc(...) \\\n    _Counter&lt;CounterGet(__VA_ARGS__) + 1&gt; _CounterSeen(__VA_ARGS__, \\\n            _Counter&lt;(CounterGet(__VA_ARGS__) + 1) &amp; ~ CounterGet(__VA_ARGS__)&gt;, \\\n            _Counter&lt;(CounterGet(__VA_ARGS__) + 1) &amp; CounterGet(__VA_ARGS__)&gt; \\\n        );\n\n\/\/ \u7528\u6cd5\nCounterInc(MyType)\nchar v0[CounterGet(MyType)]; \/\/ char [1]\nCounterInc(MyType)\nchar v1[CounterGet(MyType)]; \/\/ char [2]<\/code><\/pre>\n<p>\u5927\u7ea6\u5c31\u662f\u6bcf\u6b21\u7533\u660e\u4e00\u4e2a\u51fd\u6570, \u5728\u8fd9\u91cc\u9762\u5b9e\u4f8b\u5316\u4e86\u6a21\u677f, \u5e76\u6700\u7ec8\u5bfc\u81f4 sizeof \u8ba1\u7b97\u7684\u7ed3\u679c\u9010\u6e10\u589e\u5927<\/p>\n<hr \/>\n<p>\u597d\u4e86, \u4e07\u4e8b\u4ff1\u5907, \u5f00\u59cb\u6211\u4eec\u86cb\u75bc\u7684\u6a21\u677f\u7279\u5316\u5427<\/p>\n<pre><code class=\"language-cpp\">\/\/ \u539f\u59cb\u7248\u672c\ntemplate&lt;typename T, int T_Loop&gt;\nclass Holder\n{\npublic:\n    static void func(void)\n    {\n        Holder&lt;T, T_Loop + 1&gt;::func();\n    }\n};\n\n\/\/ \u504f\u7279\u5316\u7248\u672c\ntemplate&lt;typename T&gt;\nclass Holder&lt;T, 4&gt;\n{\npublic:\n    static void func(void)\n    {\n        defaultAction();\n    }\n};\n\ntypedef int MyTypeA;\ntypedef int MyTypeB;\n\n\/\/ \u7b2c\u4e00\u6b21\u7279\u5316\nCounterInc(MyTypeA)\ntemplate&lt;&gt;\nclass Holder&lt;MyTypeA, CounterGet(MyTypeA)&gt;\n{\npublic:\n    static void func(void)\n    {\n        \/\/ \u7279\u5316\u7248\u672c\n        specializaionAction();\n    }\n};\n\n\/\/ \u518d\u6765\u4e00\u6b21\u7279\u5316, \u6ce8\u610f\u8fd9\u91cc MyTypeB \u5176\u5b9e\u548c MyTypeA \u5b8c\u5168\u76f8\u540c\nCounterInc(MyTypeB)\ntemplate&lt;&gt;\nclass Holder&lt;MyTypeB, CounterGet(MyTypeB)&gt;\n{\npublic:\n    static void func(void)\n    {\n        \/\/ \u7279\u5316\u7248\u672c\n        specializaionAction();\n    }\n};<\/code><\/pre>\n<p>\u6ce8\u610f\u5230\u5176\u95f4\u7684\u7384\u673a\u4e86\u561b<\/p>\n<ul>\n<li>\u539f\u59cb\u7248\u672c\u91c7\u7528\u6a21\u677f\u9012\u5f52\u8c03\u7528\u4e0b\u4e00\u4e2a\u7248\u672c, \u5982\u679c\u6ca1\u6709\u63d0\u4f9b\u4efb\u4f55\u7279\u5316, \u5c06\u6700\u7ec8\u505c\u6b62\u4e8e\u504f\u7279\u5316\u7248\u672c<\/li>\n<li>\u5982\u679c\u63d0\u4f9b\u4e86\u7279\u5316, \u7531\u4e8e T_Loop \u5c0f\u4e8e\u6211\u4eec\u9ed8\u8ba4\u7684\u504f\u7279\u5316\u7248\u672c, \u6240\u4ee5\u4f18\u5148\u88ab\u4f7f\u7528\u5230<\/li>\n<li>\u5982\u679c\u5bf9\u540c\u7c7b\u578b\u63d0\u4f9b\u4e86\u591a\u6b21\u7279\u5316, \u90a3\u4e48\u9996\u6b21\u7279\u5316\u7684\u7248\u672c\u5c06\u88ab\u4f7f\u7528, \u540e\u7eed\u7684\u7248\u672c\u76f8\u5f53\u4e8e\u6c38\u8fdc\u4e0d\u4f1a\u88ab\u4f7f\u7528\u5230<\/li>\n<\/ul>\n<h1>\u6ce8\u610f\u4e8b\u9879<\/h1>\n<p>\u867d\u7136\u8fd9\u65b9\u6cd5\u770b\u4e0a\u53bb\u5f88\u7f8e, \u4f46\u662f\u4f9d\u65e7\u8fd8\u662f\u6709\u5751\u7684:<\/p>\n<ul>\n<li>\u9012\u5f52\u6a21\u677f\u7279\u5316\u4f1a\u4e25\u91cd\u6d88\u8017\u7f16\u8bd1\u671f\u7684\u65f6\u95f4, \u5c24\u5176\u6a21\u677f\u5982\u679c\u9700\u8981\u5bf9\u5916\u7684\u8bdd, \u662f\u9700\u8981\u5b8c\u5168\u5728\u5934\u6587\u4ef6\u7684, \u4ee3\u7801\u6c61\u67d3\u6027\u6bd4\u8f83\u4e25\u91cd, \u5efa\u8bae\u8c28\u614e\u4f7f\u7528<\/li>\n<li>Windows \u5e73\u53f0, \u8be5\u65b9\u6cd5\u975e\u5e38\u5bb9\u6613\u9020\u6210 C1001 (\u5927\u7ea6\u5c31\u662f\u7f16\u8bd1\u5668\u5185\u90e8\u5806\u6808\u7206\u4e86), \u4e5f\u53ef\u80fd\u641e\u51fa\u5404\u79cd\u8be1\u5f02\u95ee\u9898<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u6a21\u677f\u7279\u5316\u5927\u5bb6\u90fd\u5f88\u719f\u4e86 template&lt;typename T&gt; class Holder; \u2026 <span class=\"read-more\"><a href=\"http:\/\/zsaber.com\/blog\/p\/139\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C++ \u5bf9\u591a\u4e2a\u7c7b\u578b\u6a21\u677f\u7279\u5316\u90a3\u4e9b\u4e8b\u513f - \u67d0Z\u7684\u535a\u5ba2<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/zsaber.com\/blog\/p\/139\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++ \u5bf9\u591a\u4e2a\u7c7b\u578b\u6a21\u677f\u7279\u5316\u90a3\u4e9b\u4e8b\u513f - \u67d0Z\u7684\u535a\u5ba2\" \/>\n<meta property=\"og:description\" content=\"\u524d\u8a00 \u6a21\u677f\u7279\u5316\u5927\u5bb6\u90fd\u5f88\u719f\u4e86 template&lt;typename T&gt; 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