这段代码没问题,但是,下面并没有描述,为什么需要return std::move(values);。 我认为这十分容易被萌新错误的模仿,会在所有的函数下都写成return std::move(values);(这样会导致的问题我们上面已经提了)。 我觉得应该稍微描述一下数据成员不是隐式可移动实体,如果不 std::move,而是直接 return x,重载决议不会选...
conststd::string&& no_sense(std::string abc) { abc = abc.substr(1, 1);returnstd::move(abc); } ...conststd::string x(no_sense("cat")); std::cout << x.size() << std::endl; In both cases abc is a temporary object inside of the function and gets deleted after the function...
在C++ 11中,返回的std::vector局部变量总会被移动吗? 如果该向量是局部变量的成员而不是局部变量本身怎么办? 显然,不会移动返回全局变量.还有什么其他案例不会被移动? c++ return-value move-semantics c++11 def*_*ode 2012 06-28 18推荐指数 2解决办法 2645查看次数 如何使用xpath从节点获取属性值? 完...
std::vector<std::unique_ptr<Item>> items; template<class... TS> Item& create(TS&&... mArgs) { auto item(std::make_unique<Item>(std::forward<TS>(mArgs)...); items.emplace_back(std::move(item)); return *item; // `item` was moved, this is invalid! } Run Code Online (Sandbo...
Returning by std::move()Returning by calling std::move() on the return value is an anti-pattern. It is wrong most of the times. It will indeed attempt to force move-constructor, but in doing so it will disable RVO. It is also redundant, as move will happen if it can even without...
#include <vector>#include <iostream>structA { A(){v.push_back(3);v.push_back(5);}conststd::vector<int>& get()const{returnv;} std::vector<int> v; };intmain() { A a;conststd::vector<int>& v = a.get();for(std::size_t i = 0; i < v.size(); i++) { std::cout ...
std::vector<std::string> api_keys; @@ -624,7 +630,7 @@ struct common_chat_msg { std::string role; std::string content; std::vector<common_tool_call> tool_calls; std::string tool_plan = ""; std::string reasoning_content = ""; }; // Check if the template supplied via "--...
#include<bits/stdc++.h>usingnamespacestd; /*做法很简单:按照题目中的指示,判断每个条件是否成立即可判断条件二和条件四可以使用 for 循环*/ intn;strings;// string 相对于 char 数组 (char[])更方便 intmain{cin>> n;cin>> s; // 条件一:长度为奇数if(n%2==0) {puts("No");return0;} ...
#25 0x00007ffa62b7011d void std::__1::vector<std::__1::optional<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::allocator<std::__1::optional<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1:...
<numeric>intmain(){autoconcat=[](std::string&&l,conststd::string&r)->std::string&&{l+=r;returnstd::move(l);};std::stringsa("AAAAAAAAAAAAAAAAAAAA");std::vector<std::string>v(10,sa);autor=std::accumulate(v.begin(),v.end(),std::string{},concat);std::cout<<r<<std::endl;...