cpp - Serbipunk/notes GitHub Wiki

Copy elision

Omits copy and move(since C++11) constructors, resulting in zero-copy pass-by-value semantics.

省略拷贝构造函数 和 移动构造函数，造成在pass-by-value (相对pass-by-reference) 语境下的不拷贝。

https://en.cppreference.com/w/cpp/language/copy_elision

https://cloud.tencent.com/developer/article/1979760

return statement:

NRVO

MyClass createObject() {
    MyClass obj; // 局部变量
    return obj;  // 直接构造在目标位置，省略拷贝/移动
}

URVO

In C++17 and later, URVO is mandatory and no longer considered a form of copy elision.

MyClass createObject() {
    return MyClass(); // 临时对象直接构造在目标位置
}

throw VO

void someFunction() { MyClass obj; throw obj; // 可以省略拷贝/移动 }

这文档看的很烦。。。