\n\u5f15\u7528\u6298\u53e0\u89c4\u5219\u4fdd\u8bc1\u4e86\u8fd4\u56de\u503c\u7684\u6b63\u786e\u6027\u3002<\/p>\n<\/li>\n<\/ul>\n
#include <iostream>
\n#include <utility> \/\/ std::forward
\n#include <string><\/p>\n
\/\/ \u4e24\u4e2a\u91cd\u8f7d\u51fd\u6570，\u7528\u4e8e\u533a\u5206\u5de6\u503c\u548c\u53f3\u503c
\nvoid process(int& x) {
\n std::cout << "process(int&): \u5de6\u503c\u5f15\u7528, \u503c\u4e3a " << x << std::endl;
\n}<\/p>\n
void process(int&& x) {
\n std::cout << "process(int&&): \u53f3\u503c\u5f15\u7528, \u503c\u4e3a " << x << std::endl;
\n}<\/p>\n
\/\/ \u4e07\u80fd\u5f15\u7528\u7684\u5305\u88c5\u5668，\u4f7f\u7528 std::forward \u5b8c\u7f8e\u8f6c\u53d1
\ntemplate<typename T>
\nvoid wrapper(T&& arg) {
\n \/\/ \u5c06 arg \u4ee5\u539f\u59cb\u503c\u7c7b\u522b\u8f6c\u53d1\u7ed9 process
\n process(std::forward<T>(arg));
\n}<\/p>\n
int main() {
\n int a = 42;<\/p>\n
\/\/ \u4f20\u5165\u5de6\u503c a -> wrapper \u63a5\u6536\u5de6\u503c，forward \u540e process \u8c03\u7528\u5de6\u503c\u91cd\u8f7d
\n wrapper(a);<\/p>\n
\/\/ \u4f20\u5165\u53f3\u503c 100 -> wrapper \u63a5\u6536\u53f3\u503c，forward \u540e process \u8c03\u7528\u53f3\u503c\u91cd\u8f7d
\n wrapper(100);<\/p>\n
\/\/ \u4e5f\u53ef\u4ee5\u4f7f\u7528 std::move \u5c06\u5de6\u503c\u8f6c\u4e3a\u53f3\u503c\u4f20\u5165
\n wrapper(std::move(a)); \/\/ \u6b64\u65f6 a \u88ab\u8f6c\u4e3a\u53f3\u503c，\u8c03\u7528\u53f3\u503c\u91cd\u8f7d<\/p>\n
return 0;
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"
std::forward\u00a0\u662f C11 \u5f15\u5165\u7684\u4e00\u4e2a\u5de5\u5177，\u4f4d\u4e8e\u00a0\u00a0\u5934\u6587\u4ef6\u4e2d\u3002\u5b83\u7684\u6838\u5fc3\u4f5c\u7528\u662f\u5b8c\u7f8e\u8f6c\u53d1（perfect forwarding）\u2014\u2014\u5728\u51fd\u6570\u6a21\u677f\u4e2d，\u5c06\u53c2\u6570\u4ee5\u539f\u59cb\u7684\u5de6\u503c\/\u53f3\u503c\u5c5e\u6027（\u5373\u201c\u503c\u7c7b\u522b\u201d）\u4f20\u9012\u7ed9\u53e6\u4e00\u4e2a\u51fd\u6570，\u65e2\u4e0d\u989d\u5916\u62f7\u8d1d，\u4e5f\u4e0d\u6539\u53d8\u5176 const\/volatile \u4fee\u9970\u3002\u7b80\u5355\u8bf4，\u5c31\u662f\u201c\u4fdd\u6301\u53c2\u6570\u7684\u539f\u6837\u201d\u3002\u5b83\u7684\u5178\u578b\u4f7f\u7528\u573a\u666f\u662fÿ<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,190],"topic":[],"class_list":["post-98660","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-190"],"yoast_head":"\n
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