{"id":435792,"date":"2021-04-18T18:04:24","date_gmt":"2021-04-18T10:04:24","guid":{"rendered":"http:\/\/4563.org\/?p=435792"},"modified":"2021-04-18T18:04:24","modified_gmt":"2021-04-18T10:04:24","slug":"%e5%85%b3%e4%ba%8e-cpp-%e6%88%90%e5%91%98%e5%88%9d%e5%a7%8b%e5%8c%96%e5%88%97%e8%a1%a8%ef%bc%8c%e5%86%92%e5%8f%b7%e5%90%8e%e7%9a%84-var%ef%bc%88%ef%bc%89%e5%92%8c-var%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=435792","title":{"rendered":"\u5173\u4e8e cpp \u6210\u5458\u521d\u59cb\u5316\u5217\u8868\uff0c\u5192\u53f7\u540e\u7684 var\uff08\uff09\u548c var{}\u7684\u533a\u522b\u5230\u5e95\u662f\u4ec0\u4e48\u5462\uff1f"},"content":{"rendered":"
\n
\n
\n

\u5173\u4e8e cpp \u6210\u5458\u521d\u59cb\u5316\u5217\u8868\uff0c\u5192\u53f7\u540e\u7684 var\uff08\uff09\u548c var{}\u7684\u533a\u522b\u5230\u5e95\u662f\u4ec0\u4e48\u5462\uff1f <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : misakawaque <\/span> <\/i> 7<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u6211\u4e2a\u4eba\u7406\u89e3\u91cc var \uff08 svar \uff09\u4e2d\u4ee3\u8868\u6210\u5458\u53d8\u91cf var \u8d4b\u6210\u5458\u53d8\u91cf svar \u503c\uff0c\u5982\u679c svar \u548c\u53d8\u91cf var \u540c\u540d\uff0c\u5219\u4ee3\u8868 svar \u662f\u5f62\u53c2\u8d4b\u503c\u7ed9\u6210\u5458\u53d8\u91cf
\u800c var{svar}\u4ee3\u8868 svar \u662f\u5f62\u53c2\u8d4b\u503c\u7ed9\u6210\u5458\u53d8\u91cf var
\u90a3\u4e48\u4e0b\u5217\u7a0b\u5e8f\u7684\u8f93\u51fa\u5e94\u8be5\u662f 1 1 2 1
\u4f46\u4e8b\u5b9e\u4e0a\u8f93\u51fa\u4e3a 1 2 2 2
\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462<\/p>\n

class task1 {
public:
int a, n, p, q;
task1(int a, int n) :a(a), n(a), p{ n }, q(n) {
cout << a << ” ” << n << ” ” << p << ” ” << q << endl;
}<\/p>\n

};
void main() {
task1 t1 = task1(1, 2);<\/p>\n

} <\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (4<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : yujincheng08 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u7528 {} \u7684\u8bdd\uff0c\u5728\u6709\u63a5\u6536 initializer_list \u7684\u6784\u9020\u51fd\u6570\u65f6\u5019\u6709\u533a\u522b\u3002
    \u53e6\u5916\u5c31\u662f return \u65f6\u5019\u53ef\u4ee5\u7528 {} \u5f53\u573a\u540e\u7eed\u4e00\u4e2a\u5bf9\u8c61\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : misakawaque <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @yujincheng08 \u5927\u4f6c\u80fd\u4e3e\u4e2a\u4f8b\u5b50\u4e48\uff0c\u4e0d\u592a\u660e\u767d
    \u63a5\u6536\u6709\u521d\u59cb\u5316\u5217\u8868\u7684\u6784\u9020\u51fd\u6570\u662f\u6307\u7ee7\u627f\u7236\u7c7b\u4e48
    \u8fd8\u6709 return \u540e\u7eed\u5bf9\u8c61\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : page4aq <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u548c (), {} \u6ca1\u5173\u7cfb\u3002<\/p>\n

    int a, n, p, q;
    task1(int a, int n) :a(a), n(a), p{ n }, q(n) <\/p>\n

    \u6784\u9020\u51fd\u6570\u53c2\u6570\u548c\u7c7b\u6210\u5458\u53d8\u91cf\u91cd\u540d\u3002\u4e00\u822c\u4e0d\u4f1a\u8fd9\u4e48\u5b9a\u4e49\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : yujincheng08 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @misakawaque
    “`cpp
    #include <initializer_list>
    #include <iostream><\/p>\n

    struct Test {
    template <typename T> Test(const std::initializer_list<T> &) {
    std::cout << “ctor w\/ initializer_list” << std::endl;
    }
    template<typename …T> Test(T&&…) {
    std::cout << “ctor w\/o initializer_list” << std::endl;
    }
    };<\/p>\n

    Test test() {
    return {1,2,3,4};
    }<\/p>\n

    int main() {
    Test x{1,2,3,4};
    Test y(1,2,3,4);
    auto z = test();
    return 0;
    }
    “`<\/p>\n

    Output:
    “`
    ctor w\/ initializer_list
    ctor w\/o initializer_list
    ctor w\/ initializer_list
    “` <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n","protected":false},"excerpt":{"rendered":"

    \u5173\u4e8e cpp \u6210\u5458\u521d\u59cb\u5316\u5217\u8868\uff0c\u5192\u53f7…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/435792"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=435792"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/435792\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=435792"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=435792"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=435792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}