{"id":796,"date":"2024-09-05T20:10:12","date_gmt":"2024-09-05T12:10:12","guid":{"rendered":"https:\/\/thereisno.top\/?p=796"},"modified":"2024-10-22T15:31:44","modified_gmt":"2024-10-22T07:31:44","slug":"c-%e5%92%8c-%e7%9a%84%e4%bd%9c%e7%94%a8%e5%92%8c%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/thereisno.top\/?p=796","title":{"rendered":"C++ \u53cc\u5192\u53f7::\u00a0 \u70b9.\u548c->\u548c\u5355\u5192\u53f7:\u7684\u4f5c\u7528\u548c\u533a\u522b"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li><mark style=\"background-color:#fcb900\" class=\"has-inline-color\">A.B\u5219A\u4e3a\u5bf9\u8c61\u6216\u8005\u7ed3\u6784\u4f53\uff1b \u70b9\u53f7\uff08.\uff09\uff1a\u5de6\u8fb9\u5fc5\u987b\u4e3a\u5b9e\u4f53\u3002<\/mark><\/li>\n\n\n\n<li><mark style=\"background-color:#fcb900\" class=\"has-inline-color\">A-&gt;B\u5219A\u4e3a\u6307\u9488\uff0c-&gt;\u662f\u6210\u5458\u63d0\u53d6\uff0cA-&gt;B\u662f\u63d0\u53d6A\u4e2d\u7684\u6210\u5458B\uff0cA\u53ea\u80fd\u662f\u6307\u5411\u7c7b\u3001\u7ed3\u6784\u3001\u8054\u5408\u7684\u6307\u9488\uff1b \u7bad\u5934\uff08-&gt;\uff09\uff1a\u5de6\u8fb9\u5fc5\u987b\u4e3a\u6307\u9488\uff1b<\/mark><\/li>\n<\/ul>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">class A<br>{<br>public:<br>&nbsp;&nbsp;&nbsp; int a = 0;<br>};<br>int main()<br>{<br>&nbsp;&nbsp;&nbsp; A b;<br>&nbsp;&nbsp;&nbsp; A *p = &amp;b;<br>&nbsp;&nbsp;&nbsp; b.a; <em>\/\/\u7c7b\u7c7b\u578b\u7684\u5bf9\u8c61\u8bbf\u95ee\u7c7b\u7684\u6210\u5458<br><\/em>&nbsp;&nbsp;&nbsp; p-&gt;a; <em>\/\/\u7c7b\u7c7b\u578b\u7684\u6307\u9488\u8bbf\u95ee\u7c7b\u7684\u6210\u5458<br><\/em>}<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><mark style=\"background-color:#fcb900\" class=\"has-inline-color\">::\u662f\u4f5c\u7528\u57df\u8fd0\u7b97\u7b26\uff0cA::B\u8868\u793a\u4f5c\u7528\u57dfA\u4e2d\u7684-\u540d\u79f0B\uff0cA\u53ef\u4ee5\u662f\u540d\u5b57\u7a7a\u95f4\u3001\u7c7b\u3001\u7ed3\u6784\uff1b<\/mark><\/li>\n\n\n\n<li>\u7c7b\u4f5c\u7528\u57df\u64cd\u4f5c\u7b26<br><mark style=\"background-color:#fcb900\" class=\"has-inline-color\">\u201c::\u201d\u6307\u660e\u4e86\u6210\u5458\u51fd\u6570\u6240\u5c5e\u7684\u7c7b\u3002<\/mark>\u5982\uff1aM::f(s)\u5c31\u8868\u793af(s)\u662f\u7c7bM\u7684\u6210\u5458\u51fd\u6570\u3002&nbsp;<em>\u4f5c\u7528\u57df\uff0c\u5982\u679c\u60f3\u5728\u7c7b\u7684\u5916\u90e8\u5f15\u7528\u9759\u6001\u6210\u5458\u51fd\u6570\uff0c\u6216\u5728\u7c7b\u7684\u5916\u90e8\u5b9a\u4e49\u6210\u5458\u51fd\u6570\u90fd\u8981\u7528\u5230\u3002\u4f7f\u7528\u547d\u540d\u7a7a\u95f4\u91cc\u7684\u7c7b\u578b\u6216\u51fd\u6570\u4e5f\u8981\u7528\u5230\uff08\u5982\uff1astd::cout, std::cin, std::string \u7b49\u7b49\uff09<\/em><\/li>\n\n\n\n<li>\u8868\u793a\u201c\u57df\u64cd\u4f5c\u7b26\u201d \u4f8b\uff1a\u58f0\u660e\u4e86\u4e00\u4e2a\u7c7bA\uff0c\u7c7bA\u91cc\u58f0\u660e\u4e86\u4e00\u4e2a\u6210\u5458\u51fd\u6570void f()\uff0c\u4f46\u6ca1\u6709\u5728\u7c7b\u7684\u58f0\u660e\u91cc\u7ed9\u51faf\u7684\u5b9a\u4e49\uff0c\u90a3\u4e48\u5728\u7c7b\u5916\u5b9a\u4e49f\u65f6\uff0c \u5c31\u8981\u5199\u6210void A::f()\uff0c\u8868\u793a\u8fd9\u4e2af()\u51fd\u6570\u662f\u7c7bA\u7684\u6210\u5458\u51fd\u6570\u3002<\/li>\n\n\n\n<li>\u8868\u793a\u5f15\u7528\u6210\u5458\u51fd\u6570\u53ca\u53d8\u91cf\uff0c\u4f5c\u7528\u57df\u6210\u5458\u8fd0\u7b97\u7b26 \u4f8b\uff1aSystem::Math::Sqrt() \u76f8\u5f53\u4e8eSystem.Math.Sqrt()<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">class Test{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Test();<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; static void print()<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; std::cout&lt;&lt;&#8220;Test&#8221;&lt;&lt;endl; <em>\/\/\u547d\u540d\u7a7a\u95f4\u65f6\u4f7f\u7528::<br><\/em>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; private:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int a;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; };<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Test::Test() : a(1)&nbsp;&nbsp; <em>\/\/\u6210\u5458\u51fd\u6570\u5b9a\u4e49\u65f6\u4f7f\u7528::<br><\/em>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {}<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Test::get();&nbsp; <em>\/\/\u4f7f\u7528\u9759\u6001\u6210\u5458\u51fd\u6570\u65f6\u7528::<br><\/em>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#8220;`<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; &#8220;`\uff1a&#8220;`\u4e00\u822c\u7528\u6765\u8868\u793a\u7ee7\u627f\uff1b<br>1. \u8868\u793a\u673a\u6784\u5185\u4f4d\u57df\u7684\u5b9a\u4e49\uff08\u5373\u8be5\u53d8\u91cf\u5360\u51e0\u4e2abit\u7a7a\u95f4\uff09<br>&#8220;`C++<br>typedef struct _XXX{<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">unsigned char a:4;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">unsigned char c;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">};<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5728<a href=\"https:\/\/zhida.zhihu.com\/search?q=%E6%9E%84%E9%80%A0%E5%87%BD%E6%95%B0&amp;zhida_source=entity&amp;is_preview=1\">\u6784\u9020\u51fd\u6570<\/a>\u540e\u9762\uff0c\u5192\u53f7\u8d77\u5206\u5272\u4f5c\u7528\uff0c\u662f\u7c7b\u7ed9\u6210\u5458\u53d8\u91cf\u8d4b\u503c\u7684\u65b9\u6cd5\uff0c\u521d\u59cb\u5316\u5217\u8868\uff0c\u66f4\u9002\u7528\u4e8e\u6210\u5458\u53d8\u91cf\u7684\u5e38\u91cfconst\u578b\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u6784\u9020\u51fd\u6570\uff0c\u5c31\u662f\u4e0e\u7c7b\u540c\u540d\u7684\u51fd\u6570\uff0c\u5b83\u4e0e\u666e\u901a\u51fd\u6570\u7684\u533a\u522b\u5728\u4e8e\uff0c\u5b83\u6ca1\u6709\u8fd4\u56de\u7c7b\u578b\u3002\u5728\u6784\u9020\u51fd\u6570\u540e\u9762\u7d27\u8ddf\u7740\u5192\u53f7\u52a0\u521d\u59cb\u5316\u5217\u8868\uff0c\u5404\u521d\u59cb\u5316\u53d8\u91cf\u4e4b\u95f4\u4ee5\u9017\u53f7(,)\u9694\u5f00\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">class myClass<br>{<br>public :<br>&nbsp;&nbsp;&nbsp; myClass();<em>\/\/ <\/em><em>\u6784\u9020\u51fd\u6570\uff0c\u65e0\u8fd4\u56de\u7c7b\u578b\uff0c\u53ef\u4ee5\u6709<\/em><a href=\"https:\/\/zhida.zhihu.com\/search?q=%E5%8F%82%E6%95%B0%E5%88%97%E8%A1%A8&amp;zhida_source=entity&amp;is_preview=1\"><em>\u53c2\u6570\u5217\u8868<\/em><\/a><em>\uff0c\u8fd9\u91cc\u7701\u53bb<\/em><em><br><\/em>&nbsp;&nbsp;&nbsp; ~myClass();<em>\/\/ <\/em><a href=\"https:\/\/zhida.zhihu.com\/search?q=%E6%9E%90%E6%9E%84%E5%87%BD%E6%95%B0&amp;zhida_source=entity&amp;is_preview=1\"><em>\u6790\u6784\u51fd\u6570<\/em><\/a><em><br><\/em>&nbsp;&nbsp;&nbsp; int a;<br>&nbsp;&nbsp;&nbsp; const int b;<br>}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">myClass::myClass():a(1),b(1)<em>\/\/ <\/em><em>\u521d\u59cb\u5316\u5217\u8868<\/em><em><br><\/em>{<br>}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><mark style=\"background-color:#fcb900\" class=\"has-inline-color\">\u5173\u4e8e\u201c\uff1a\u201d\u5192\u53f7\u7684\u7528\u6cd5\u7684\u8bf4\u660e\uff1a 1) \u521d\u59cb\u5316\u5217\u8868\u7684\u4f5c\u7528\u76f8\u5f53\u4e8e\u5728\u6784\u9020\u51fd\u6570\u5185\u8fdb\u884c\u76f8\u5e94\u6210\u5458\u53d8\u91cf\u7684\u8d4b\u503c\uff0c\u4f46\u4e24\u8005\u662f\u6709\u5dee\u522b\u7684\u3002 <\/mark>\u5728\u521d\u59cb\u5316\u5217\u8868\u4e2d\u662f\u5bf9\u53d8\u91cf\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u800c\u5728\u6784\u9020\u51fd\u6570\u5185\u662f\u8fdb\u884c\u8d4b\u503c\u64cd\u4f5c\u3002\u4e24\u90fd\u7684\u5dee\u522b\u5728\u5bf9\u4e8e\u50cfconst\u7c7b\u578b\u6570\u636e\u7684\u64cd\u4f5c\u4e0a\u8868\u73b0\u5f97\u5c24\u4e3a\u660e\u663e\uff1aconst \u7c7b\u578b\u7684\u53d8\u91cf\u5fc5\u987b\u5728\u5b9a\u4e49\u65f6\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u800c\u4e0d\u80fd\u5bf9const\u578b\u7684\u53d8\u91cf\u8fdb\u884c\u8d4b\u503c\uff0c\u56e0\u6b64const\u7c7b\u578b\u7684\u6210\u5458\u53d8\u91cf\u53ea\u80fd\uff08\u800c\u4e14\u5fc5\u987b\uff09\u5728\u521d\u59cb\u5316\u5217\u8868\u4e2d\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u5982\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">myClass::myClass\uff08\uff09<br>{<br>&nbsp;&nbsp;&nbsp; a = 1;<em>\/\/ <\/em><em>\u6ca1\u9519\uff0c\u6548\u679c\u76f8\u5f53\u4e8e\u5728\u521d\u59cb\u5316\u5217\u8868\u4e2d\u8fdb\u884c\u521d\u59cb\u5316<\/em><em><br><\/em>&nbsp;&nbsp;&nbsp; b = 1;<em>\/\/ <\/em><em>\u51fa\u9519\uff0c<\/em><em>const<\/em><em>\u53d8\u91cf\u4e0d\u80fd\u8fdb\u884c\u8d4b\u503c\u64cd\u4f5c\uff1b<\/em><em><br><\/em>}<br>2) \u521d\u59cb\u5316\u7684\u987a\u5e8f\u4e0e\u6210\u5458\u53d8\u91cf\u58f0\u540d\u7684\u987a\u5e8f\u76f8\u540c\u3002<br>\u5148\u770b\u4e00\u4e0b\u4e0b\u9762\u7684\u7a0b\u5e8f\uff1a<br>myClass::myClass():b(1),a(b)<br>{<br>}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\u7684\u6267\u884c\u7ed3\u679ca,b\u5404\u662f\u591a\u5c11\u5462\uff1fb=1,a=1?\u4e0d\u662f\uff0cb=1\u800ca\u662f\u4e2a\u968f\u673a\u6570\u3002\u8fd9\u4e00\u70b9\u662f\u76f8\u5f53\u91cd\u8981\uff0c\u4e00\u822c\u5728\u521d\u59cb\u5316\u5217\u8868\u4e2d\u8fdb\u884c\u521d\u59cb\u5316\u65f6\uff0c\u521d\u59cb\u5316\u7684\u987a\u5e8f\u5e94\u4e0e\u58f0\u660e\u7684\u987a\u5e8f\u4fdd\u6301\u4e00\u81f4\uff0c\u9632\u6b62\u51fa\u73b0\u4e0d\u5fc5\u8981\u7684\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[147],"tags":[146],"class_list":["post-796","post","type-post","status-publish","format-standard","hentry","category-c","tag-c"],"_links":{"self":[{"href":"https:\/\/thereisno.top\/index.php?rest_route=\/wp\/v2\/posts\/796","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thereisno.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thereisno.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thereisno.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thereisno.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=796"}],"version-history":[{"count":5,"href":"https:\/\/thereisno.top\/index.php?rest_route=\/wp\/v2\/posts\/796\/revisions"}],"predecessor-version":[{"id":1312,"href":"https:\/\/thereisno.top\/index.php?rest_route=\/wp\/v2\/posts\/796\/revisions\/1312"}],"wp:attachment":[{"href":"https:\/\/thereisno.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thereisno.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thereisno.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}