{"id":383,"date":"2026-04-09T17:20:08","date_gmt":"2026-04-09T09:20:08","guid":{"rendered":"http:\/\/chenglixue.top\/?p=383"},"modified":"2026-04-09T17:37:05","modified_gmt":"2026-04-09T09:37:05","slug":"383","status":"publish","type":"post","link":"http:\/\/chenglixue.top\/?p=383","title":{"rendered":"\u4e0d\u79fb\u52a8\u5bf9\u8c61\u7684std move"},"content":{"rendered":"

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

std::move\u505a\u4e86\u4ec0\u4e48<\/h1>\n

std::move\u4e0d\u50cf\u5b83\u7684\u540d\u5b57\u4f1a\u79fb\u52a8\u5bf9\u8c61\uff0c\u800c\u662f\u66f4\u6362\u6240\u6709\u6743<\/strong>\u2014\u2014\u5c06\u539f\u6307\u9488\u7f6e\u7a7a\uff0c\u6307\u9488\u8d4b\u7ed9\u65b0\u5bf9\u8c61<\/strong><\/p>\n

MyString(MyString&& other) noexcept {\n    data_ = other.data_;     \/\/ \u8d4b\u6307\u9488\n    size_ = other.size_;\n    other.data_ = nullptr;\n    other.size_ = 0;\n}\n<\/code><\/pre>\n
\u4f46\u4ee5\u4e0a\u4ee3\u7801\u5e76\u4e0d\u662fstd::move\u5e72\u7684\u6d3b\uff0c\u5177\u4f53\u800c\u8a00\uff0cstd::move\u4ec5\u4ec5\u505a\u4e86\u7c7b\u578b\u8f6c\u6362\uff0c\u5c06\u5de6\u503c\u6362\u6210\u53f3\u503c\u5f15\u7528<\/strong>\uff0c\u6ca1\u6709\u4efb\u4f55\u5206\u914d\u5f00\u9500<\/strong>\uff0c\u800c\u4e14\u66f4\u6362\u6240\u6709\u6743\u7684\u64cd\u4f5c\u662f\u4ea4\u7ed9\u79fb\u52a8\u6784\u9020\u51fd\u6570\/\u79fb\u52a8\u8d4b\u503c\u8fd0\u7b97\u7b26<\/strong><\/p>\n
template<typename T>\ntypename std::remove_reference<T>::type&& move(T&& arg) noexcept \n{\n    return static_cast<typename std::remove_reference<T>::type&&>(arg);\n}\n<\/code><\/pre>\n
\u79fb\u52a8\u540e\u7684\u5bf9\u8c61\u8fd8\u80fd\u7528\u5417\uff1f<\/h1>\n
\u79fb\u52a8\u540e\u7684\u5bf9\u8c61\u5904\u4e8e\u6709\u6548\u4f46\u672a\u6307\u5b9a\u7684\u72b6\u6001<\/strong><\/p>\n
std::string a = \"hello world\";\nstd::string b = std::move(a);\n\nstd::cout << \"a = '\" << a << \"'\" << std::endl;  \/\/ \u901a\u5e38\u8f93\u51fa\uff1aa = ''\nstd::cout << \"a.size() = \" << a.size() << std::endl;  \/\/ \u901a\u5e38\u8f93\u51fa\uff1a0\n<\/code><\/pre>\n
\u8fd9\u610f\u5473\u7740\u53ef\u4ee5\u5bf9\u5b83\u8c03\u7528\u4e0d\u4f9d\u8d56\u5177\u4f53\u503c\u7684\u64cd\u4f5c\uff08\u5982size()\uff09\uff0c\u4f46\u4e0d\u80fd\u5047\u5b9a\u5b83\u7684\u503c\u662f\u4ec0\u4e48<\/p>\n
std::move\u8be5\u4ec0\u4e48\u65f6\u5019\u7528<\/h1>\n
    \n
  • \u660e\u786e\u4e0d\u518d\u9700\u8981\u67d0\u4e2a\u5bf9\u8c61\n
    std::vector<std::string> names;\nstd::string name = getUserInput();\nnames.push_back(std::move(name));  \/\/ name\u4e4b\u540e\u4e0d\u518d\u4f7f\u7528\n<\/code><\/pre>\n<\/li>\n
  • \u5728\u7c7b\u7684\u79fb\u52a8\u6784\u9020\/\u8d4b\u503c\u4e2d\u8f6c\u79fb\u6210\u5458\n
    class Person \n{\npublic:\n  Person(Person&& other) noexcept\n      : name_(std::move(other.name_)),\n        address_(std::move(other.address_)) {\n  }\n\nprivate:\n  std::string name_;\n  std::string address_;\n};\n<\/code><\/pre>\n<\/li>\n
  • swap\n
    template<typename T>\nvoid mySwap(T& a, T& b) \n{\n  T temp = std::move(a);\n  a = std::move(b);\n  b = std::move(temp);\n}\n<\/code><\/pre>\n<\/li>\n<\/ul>\n
    \u4ec0\u4e48\u65f6\u5019\u4e0d\u80fd\u7528std::move<\/h1>\n
      \n
    • \u5bf9const\u5bf9\u8c61std::move\n
      \u5bf9const\u5bf9\u8c61std::move\uff0c\u9759\u9ed8\u9000\u5316\u4e3a\u62f7\u8d1d\uff0c\u4e14\u7f16\u8f91\u5668\u6ca1\u6709\u4efb\u4f55\u8b66\u544a<\/p>\n<\/li>\n
    • \n
      return\u52a0std::move<\/p>\n
      return\u52a0std::move\u4f1a\u963b\u6b62RVO<\/strong>\u4f18\u5316\uff08\u5728\u8c03\u7528\u65b9\u9884\u7559\u7684\u5185\u5b58\u7a7a\u95f4\u91cc\u6784\u9020result\uff0c\u4e0d\u9700\u8981\u4efb\u4f55\u62f7\u8d1d\u6216\u79fb\u52a8\uff09<\/p>\n<\/li>\n
    • \n
      \u79fb\u52a8\u6784\u9020\u4e0d\u52a0noexcept\uff0c\u5bb9\u5668\u6269\u5bb9\u9000\u5316\u4e3a\u62f7\u8d1d<\/p>\n
      class\u00a0MyBuffer\u00a0{\n\u00a0 \u00a0\u00a0char* data_;\n\u00a0 \u00a0\u00a0size_t\u00a0size_;\npublic:\n\u00a0 \u00a0\u00a0\/\/ \u79fb\u52a8\u6784\u9020\u51fd\u6570\uff0c\u6ca1\u52a0noexcept\n\u00a0 \u00a0 MyBuffer(MyBuffer&& other)\u00a0\n\u00a0 \u00a0 \u00a0 \u00a0 : data_(other.data_), size_(other.size_)\u00a0\n\u00a0 \u00a0 {\n\u00a0 \u00a0 \u00a0 \u00a0 other.data_ =\u00a0nullptr;\n\u00a0 \u00a0 \u00a0 \u00a0 other.size_ =\u00a00;\n\u00a0 \u00a0 }\n\u00a0 \u00a0\u00a0\/\/ ...\n};\n\nstd::vector<MyBuffer> buffers;\nbuffers.reserve(2);\nbuffers.emplace_back(\/*...*\/);\nbuffers.emplace_back(\/*...*\/);\nbuffers.emplace_back(\/*...*\/); \u00a0\/\/ \u89e6\u53d1\u6269\u5bb9\uff01\n<\/code><\/pre>\n
      \u6269\u5bb9\u65f6\u5982\u679c\u79fb\u52a8\u6784\u9020\u51fd\u6570\u6ca1\u6709\u52a0noexcept\uff0c\u4f1a\u9000\u5316\u4e3a\u62f7\u8d1d\uff0c\u800c\u4e0d\u662f\u79fb\u52a8<\/p>\n
      \u8fd9\u662f\u56e0\u4e3avector\u5fc5\u987b\u4fdd\u8bc1\u5f3a\u5f02\u5e38\u5b89\u5168<\/strong>\uff0c\u56e0\u4e3a\u6709\u53ef\u80fd\u642c\u8fd0\u65f6\u4f1a\u51fa\u95ee\u9898\uff0c\u539f\u672c\u7684\u6570\u636e\u5fc5\u987b\u662f\u5b8c\u597d\u7684<\/p>\n
      \u56e0\u6b64\u60f3\u8ba9\u6269\u5bb9\u65f6\u6267\u884c\u79fb\u52a8\uff0c\u5c31\u9700\u8981\u4e3a\u79fb\u52a8\u6784\u9020\u51fd\u6570\u52a0\u4e0anoexcept<\/strong><\/p>\n
      \u90a3\u4e48\u4ec0\u4e48\u65f6\u5019\u8be5\u52a0\u4ec0\u4e48\u65f6\u5019\u4e0d\u8be5\u52a0\u5462\uff1f\u53ea\u8981\u80fd\u4fdd\u8bc1\u5b83\u4e0d\u629b\u5f02\u5e38\uff08\u6307\u9488\u8d4b\u503c\u548c\u7f6e\u7a7a\u4e0d\u4f1a\u629b\u5f02\u5e38\uff09\uff0c\u5c31\u5fc5\u987b\u52a0noexcept<\/strong><\/p>\n<\/li>\n<\/ul>\n
      \u603b\u7ed3<\/h1>\n
      std::move\u4e0d\u79fb\u52a8\u5bf9\u8c61\uff0c\u53ea\u662f\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\uff0c\u5c06\u5de6\u503c\u8f6c\u6362\u6210\u53f3\u503c\u5f15\u7528\uff1b\u771f\u6b63\u79fb\u52a8\u5bf9\u8c61\u7684\u662f\u79fb\u52a8\u6784\u9020\u51fd\u6570\u6216\u79fb\u52a8\u8d4b\u503c\u8fd0\u7b97\u7b26<\/p>\n
      Reference<\/h1>\n
      https:\/\/mp.weixin.qq.com\/s\/J8QPz6QDPSexWaBpYCVcCg<\/p>\n","protected":false},"excerpt":{"rendered":"
      std::move\u505a\u4e86\u4ec0\u4e48 std::move\u4e0d\u50cf\u5b83\u7684\u540d\u5b57\u4f1a\u79fb\u52a8\u5bf9\u8c61\uff0c\u800c\u662f\u66f4\u6362\u6240\u6709\u6743\u2014\u2014\u5c06\u539f\u6307\u9488\u7f6e\u7a7a\uff0c\u6307\u9488\u8d4b\u7ed9\u65b0\u5bf9\u8c61 MyStri …<\/p>","protected":false},"author":1,"featured_media":384,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"_links":{"self":[{"href":"http:\/\/chenglixue.top\/index.php?rest_route=\/wp\/v2\/posts\/383"}],"collection":[{"href":"http:\/\/chenglixue.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/chenglixue.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/chenglixue.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/chenglixue.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=383"}],"version-history":[{"count":2,"href":"http:\/\/chenglixue.top\/index.php?rest_route=\/wp\/v2\/posts\/383\/revisions"}],"predecessor-version":[{"id":386,"href":"http:\/\/chenglixue.top\/index.php?rest_route=\/wp\/v2\/posts\/383\/revisions\/386"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/chenglixue.top\/index.php?rest_route=\/wp\/v2\/media\/384"}],"wp:attachment":[{"href":"http:\/\/chenglixue.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=383"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/chenglixue.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=383"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/chenglixue.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=383"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}