{"id":2389,"date":"2024-07-16T16:13:54","date_gmt":"2024-07-16T08:13:54","guid":{"rendered":"https:\/\/courtship.top\/?p=2389"},"modified":"2024-07-17T12:38:42","modified_gmt":"2024-07-17T04:38:42","slug":"const-%e5%85%a8%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/courtship.top\/index.php\/2024\/07\/16\/const-%e5%85%a8%e8%a7%a3\/","title":{"rendered":"const \u5168\u89e3"},"content":{"rendered":"\n
\n

<\/p>\n\u8f6c\u81ea http:\/\/t.csdnimg.cn\/b6AyP<\/a><\/cite><\/blockquote>\n\n\n\n

const\u7684\u610f\u4e49\u548c\u4f18\u70b9<\/h2>\n\n\n\n

\u5173\u952e\u5b57const\u7528\u6765\u5b9a\u4e49\u5e38\u91cf\uff0c\u5982\u679c\u4e00\u4e2a\u53d8\u91cf\u88abconst\u4fee\u9970\uff0c\u90a3\u4e48\u5b83\u7684\u503c\u5c31\u4e0d\u80fd\u518d\u88ab\u6539\u53d8\uff0c\u6211\u60f3\u4e00\u5b9a\u6709\u4eba\u6709\u8fd9\u6837\u7684\u7591\u95ee\uff0cC\u8bed\u8a00\u4e2d\u4e0d\u662f\u6709#define\u5417\uff0c\u5e72\u561b\u8fd8\u8981\u7528const\u5462\uff0c\u6211\u60f3\u4e8b\u7269\u7684\u5b58\u5728\u4e00\u5b9a\u6709\u5b83\u81ea\u5df1\u7684\u9053\u7406\uff0c\u6240\u4ee5\u8bf4const\u7684\u5b58\u5728\u4e00\u5b9a\u6709\u5b83\u7684\u5408\u7406\u6027\uff0c\u4e0e\u9884\u7f16\u8bd1\u6307\u4ee4\u76f8\u6bd4\uff0cconst\u4fee\u9970\u7b26\u6709\u4ee5\u4e0b\u7684\u4f18\u70b9\uff1a<\/p>\n\n\n\n

    \n
  • \u9884\u7f16\u8bd1\u6307\u4ee4\u53ea\u662f\u5bf9\u503c\u8fdb\u884c\u7b80\u5355\u7684\u66ff\u6362\uff0c\u4e0d\u80fd\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5<\/li>\n\n\n\n
  • \u53ef\u4ee5\u4fdd\u62a4\u88ab\u4fee\u9970\u7684\u4e1c\u897f\uff0c\u9632\u6b62\u610f\u5916\u4fee\u6539\uff0c\u589e\u5f3a\u7a0b\u5e8f\u7684\u5065\u58ee\u6027<\/li>\n\n\n\n
  • \u7f16\u8bd1\u5668\u901a\u5e38\u4e0d\u4e3a\u666e\u901aconst\u5e38\u91cf\u5206\u914d\u5b58\u50a8\u7a7a\u95f4\uff0c\u800c\u662f\u5c06\u5b83\u4eec\u4fdd\u5b58\u5728\u7b26\u53f7\u8868\u4e2d\uff0c\u8fd9\u4f7f\u5f97\u5b83\u6210\u4e3a\u4e00\u4e2a\u7f16\u8bd1\u671f\u95f4\u7684\u5e38\u91cf\uff0c\u6ca1\u6709\u4e86\u5b58\u50a8\u4e0e\u8bfb\u5185\u5b58\u7684\u64cd\u4f5c\uff0c\u4f7f\u5f97\u5b83\u7684\u6548\u7387\u4e5f\u5f88\u9ad8\u3002<\/li>\n<\/ul>\n\n\n\n

    \u7528\u6cd5<\/h2>\n\n\n\n

    \u4fee\u9970\u5c40\u90e8\u53d8\u91cf<\/h3>\n\n\n\n
    const int n=5;\nint const n=5;<\/code><\/pre>\n\n\n\n
    \u8fd9\u4e24\u79cd\u5199\u6cd5\u662f\u4e00\u6837\u7684<\/strong>\uff0c\u90fd\u662f\u8868\u793a\u53d8\u91cfn\u7684\u503c\u4e0d\u80fd\u88ab\u6539\u53d8\u4e86\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u7528const\u4fee\u9970\u53d8\u91cf\u65f6\uff0c\u4e00\u5b9a\u8981\u7ed9\u53d8\u8138\u521d\u59cb\u5316\uff0c\u5426\u5219\u4e4b\u540e\u5c31\u4e0d\u80fd\u518d\u8fdb\u884c\u8d4b\u503c\u4e86\u3002<\/p>\n\n\n\n
    \u63a5\u4e0b\u6765\u770b\u770bconst\u7528\u4e8e\u4fee\u9970\u5e38\u91cf\u9759\u6001\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n
    const char* str=\"fdsafdsa\";<\/code><\/pre>\n\n\n\n
    \u5982\u679c\u6ca1\u6709const\u7684\u4fee\u9970\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u5728\u540e\u9762\u6709\u610f\u65e0\u610f\u7684\u5199str[4]=\u2019x\u2019\u8fd9\u6837\u7684\u8bed\u53e5\uff0c\u8fd9\u6837\u4f1a\u5bfc\u81f4\u5bf9\u53ea\u8bfb\u5185\u5b58\u533a\u57df\u7684\u8d4b\u503c\uff0c\u7136\u540e\u7a0b\u5e8f\u4f1a\u7acb\u523b\u5f02\u5e38\u7ec8\u6b62\u3002\u6709\u4e86const\uff0c\u8fd9\u4e2a\u9519\u8bef\u5c31\u80fd\u5728\u7a0b\u5e8f\u88ab\u7f16\u8bd1\u7684\u65f6\u5019\u5c31\u7acb\u5373\u68c0\u67e5\u51fa\u6765\uff0c\u8fd9\u5c31\u662fconst\u7684\u597d\u5904\u3002\u8ba9\u903b\u8f91\u9519\u8bef\u5728\u7f16\u8bd1\u671f\u88ab\u53d1\u73b0\u3002<\/p>\n\n\n\n
    \u5e38\u91cf\u6307\u9488\u4e0e\u6307\u9488\u5e38\u91cf<\/h3>\n\n\n\n
    \u5e38\u91cf\u6307\u9488<\/h4>\n\n\n\n
    \u5e38\u91cf\u6307\u9488\u662f\u6307\u9488\u6307\u5411\u7684\u5185\u5bb9\u662f\u5e38\u91cf\uff0c\u53ef\u4ee5\u6709\u4e00\u4e0b\u4e24\u79cd\u5b9a\u4e49\u65b9\u5f0f\u3002<\/p>\n\n\n\n
    const int * n;\nint const * n;<\/code><\/pre>\n\n\n\n
    \u9700\u8981\u6ce8\u610f\u7684\u662f\u4e00\u4e0b\u4e24\u70b9\uff1a<\/p>\n\n\n\n
    1\u3001\u5e38\u91cf\u6307\u9488\u8bf4\u7684\u662f\u4e0d\u80fd\u901a\u8fc7\u8fd9\u4e2a\u6307\u9488\u6539\u53d8\u53d8\u91cf\u7684\u503c\uff0c\u4f46\u662f\u8fd8\u662f\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u7684\u5f15\u7528\u6765\u6539\u53d8\u53d8\u91cf\u7684\u503c\u7684\u3002<\/p>\n\n\n\n
    int a=5;\nconst int* n=&a;\na=6;<\/code><\/pre>\n\n\n\n
    2\u3001\u5e38\u91cf\u6307\u9488\u6307\u5411\u7684\u503c\u4e0d\u80fd\u6539\u53d8\uff0c\u4f46\u662f\u8fd9\u5e76\u4e0d\u662f\u610f\u5473\u7740\u6307\u9488\u672c\u8eab\u4e0d\u80fd\u6539\u53d8\uff0c\u5e38\u91cf\u6307\u9488\u53ef\u4ee5\u6307\u5411\u5176\u4ed6\u7684\u5730\u5740\u3002<\/p>\n\n\n\n
    int a=5;\nint b=6;\nconst int* n=&a;\nn=&b;<\/code><\/pre>\n\n\n\n
    \u6307\u9488\u5e38\u91cf<\/h4>\n\n\n\n
    \u6307\u9488\u5e38\u91cf\u662f\u6307\u6307\u9488\u672c\u8eab\u662f\u4e2a\u5e38\u91cf\uff0c\u4e0d\u80fd\u5728\u6307\u5411\u5176\u4ed6\u7684\u5730\u5740\uff0c\u5199\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    int *const n;<\/code><\/pre>\n\n\n\n
    \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6307\u9488\u5e38\u91cf\u6307\u5411\u7684\u5730\u5740\u4e0d\u80fd\u6539\u53d8\uff0c\u4f46\u662f\u5730\u5740\u4e2d\u4fdd\u5b58\u7684\u6570\u503c\u662f\u53ef\u4ee5\u6539\u53d8\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u6307\u5411\u6539\u5730\u5740\u7684\u6307\u9488\u6765\u4fee\u6539\u3002<\/p>\n\n\n\n
    int a=5;\nint p=&a; int<\/em> const n=&a;\n*p=8;<\/code><\/pre>\n\n\n\n
    \u533a\u5206\u5e38\u91cf\u6307\u9488\u548c\u6307\u9488\u5e38\u91cf\u7684\u5173\u952e\u5c31\u5728\u4e8e\u661f\u53f7\u7684\u4f4d\u7f6e\uff0c\u6211\u4eec\u4ee5\u661f\u53f7\u4e3a\u5206\u754c\u7ebf\uff0c\u5982\u679cconst\u5728\u661f\u53f7\u7684\u5de6\u8fb9\uff0c\u5219\u4e3a\u5e38\u91cf\u6307\u9488\uff0c\u5982\u679cconst\u5728\u661f\u53f7\u7684\u53f3\u8fb9\u5219\u4e3a\u6307\u9488\u5e38\u91cf\u3002\u5982\u679c\u6211\u4eec\u5c06\u661f\u53f7\u8bfb\u4f5c\u2018\u6307\u9488\u2019\uff0c\u5c06const\u8bfb\u4f5c\u2018\u5e38\u91cf\u2019\u7684\u8bdd\uff0c\u5185\u5bb9\u6b63\u597d\u7b26\u5408\u3002int const * n\uff1b\u662f\u5e38\u91cf\u6307\u9488\uff0cint *const n\uff1b\u662f\u6307\u9488\u5e38\u91cf\u3002<\/p>\n\n\n\n
    \u6307\u5411\u5e38\u91cf\u7684\u5e38\u6307\u9488<\/strong><\/h4>\n\n\n\n
    \u662f\u4ee5\u4e0a\u4e24\u79cd\u7684\u7ed3\u5408\uff0c\u6307\u9488\u6307\u5411\u7684\u4f4d\u7f6e\u4e0d\u80fd\u6539\u53d8\u5e76\u4e14\u4e5f\u4e0d\u80fd\u901a\u8fc7\u8fd9\u4e2a\u6307\u9488\u6539\u53d8\u53d8\u91cf\u7684\u503c\uff0c\u4f46\u662f\u4f9d\u7136\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u7684\u666e\u901a\u6307\u9488\u6539\u53d8\u53d8\u91cf\u7684\u503c\u3002<\/p>\n\n\n\n
    const int* const p;<\/code><\/pre>\n\n\n\n
    \u4fee\u9970\u51fd\u6570\u53c2\u6570<\/h3>\n\n\n\n
    \u6839\u636e\u5e38\u91cf\u6307\u9488\u4e0e\u6307\u9488\u5e38\u91cf\uff0cconst\u4fee\u9970\u51fd\u6570\u7684\u53c2\u6570\u4e5f\u662f\u5206\u4e3a\u4e09\u79cd\u60c5\u51b5<\/p>\n\n\n\n
    1\u3001\u9632\u6b62\u4fee\u6539\u6307\u9488\u6307\u5411\u7684\u5185\u5bb9<\/p>\n\n\n\n
    void StringCopy(char *strDestination, const char *strSource);<\/code><\/pre>\n\n\n\n
    \u5176\u4e2d strSource \u662f\u8f93\u5165\u53c2\u6570\uff0cstrDestination \u662f\u8f93\u51fa\u53c2\u6570\u3002\u7ed9 strSource \u52a0\u4e0a const \u4fee\u9970\u540e\uff0c\u5982\u679c\u51fd\u6570\u4f53\u5185\u7684\u8bed\u53e5\u8bd5\u56fe\u6539\u52a8 strSource \u7684\u5185\u5bb9\uff0c\u7f16\u8bd1\u5668\u5c06\u6307\u51fa\u9519\u8bef\u3002<\/p>\n\n\n\n
    2\u3001\u9632\u6b62\u4fee\u6539\u6307\u9488\u6307\u5411\u7684\u5730\u5740<\/p>\n\n\n\n
    void swap ( int * const p1 , int * const p2 )<\/code><\/pre>\n\n\n\n
    \u6307\u9488p1\u548c\u6307\u9488p2\u6307\u5411\u7684\u5730\u5740\u90fd\u4e0d\u80fd\u4fee\u6539\u3002<\/p>\n\n\n\n
    3\u3001\u4ee5\u4e0a\u4e24\u79cd\u7684\u7ed3\u5408\u3002<\/p>\n\n\n\n
    \u4fee\u9970\u8fd4\u56de\u503c<\/h3>\n\n\n\n
    \u5982\u679c\u7ed9\u4ee5\u201c\u6307\u9488\u4f20\u9012\u201d\u65b9\u5f0f\u7684\u51fd\u6570\u8fd4\u56de\u503c\u52a0 const \u4fee\u9970\uff0c\u90a3\u4e48\u51fd\u6570\u8fd4\u56de\u503c\uff08\u5373\u6307\u9488\uff09\u7684\u5185\u5bb9\u4e0d\u80fd\u88ab\u4fee\u6539\uff0c\u8be5\u8fd4\u56de\u503c\u53ea\u80fd\u88ab\u8d4b\u7ed9\u52a0const \u4fee\u9970\u7684\u540c\u7c7b\u578b\u6307\u9488\u3002
    \u4f8b\u5982\u51fd\u6570<\/p>\n\n\n\n
    const char * GetString(void);<\/code><\/pre>\n\n\n\n
    \u5982\u4e0b\u8bed\u53e5\u5c06\u51fa\u73b0\u7f16\u8bd1\u9519\u8bef\uff1a<\/p>\n\n\n\n
    char *str = GetString();<\/code><\/pre>\n\n\n\n
    \u6b63\u786e\u7684\u7528\u6cd5\u662f<\/p>\n\n\n\n
    const char *str = GetString();<\/code><\/pre>\n\n\n\n
    \u4fee\u9970\u7c7b\u6210\u5458\u51fd\u6570<\/h3>\n\n\n\n
    \u5982\u679cconst\u5728\u7c7b\u6210\u5458\u51fd\u6570\u540e\u9762\uff0c\u8868\u793a\u51fd\u6570\u4e0d\u53ef\u4fee\u6539\u7c7b\u5185\u7684\u6210\u5458\u53d8\u91cf<\/p>\n\n\n\n
    int func(int x, int y) const \/\/\u975e\u6210\u5458\u51fd\u6570\u4e0a\u4e0d\u5141\u8bb8\u4f7f\u7528\u7c7b\u578b\u9650\u5b9a\u7b26C\/C++(1670)\n{\n}<\/code><\/pre>\n\n\n\n
    class A\n{\n    public:\n\n        int d = 0;\n        int func(int x, int y) const\n        {\n            d++; \/\/\u8868\u8fbe\u5f0f\u5fc5\u987b\u662f\u53ef\u4fee\u6539\u7684\u5de6\u503cC\/C++(137)\n        }\n};<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
    \u8f6c\u81ea http:\/\/t.csdnimg.cn\/b6AyP const\u7684\u610f\u4e49\u548c\u4f18\u70b9 \u5173\u952e\u5b57const\u7528\u6765\u5b9a\u4e49\u5e38\u91cf\uff0c\u5982\u679c\u4e00\u4e2a\u53d8\u91cf\u88abco …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[22],"tags":[],"class_list":["post-2389","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts\/2389","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/comments?post=2389"}],"version-history":[{"count":9,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts\/2389\/revisions"}],"predecessor-version":[{"id":2400,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/posts\/2389\/revisions\/2400"}],"wp:attachment":[{"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/media?parent=2389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/categories?post=2389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/courtship.top\/index.php\/wp-json\/wp\/v2\/tags?post=2389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}