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分享转自stackoverflow的问题
Please consider the three functions.
std::string get_a_string()
{
return "hello";
}
std::string get_a_string1()
{
return std::string("hello");
}
std::string get_a_string2()
{ std::string str("hello");
return str;
}
1.Will Return Value Optimization be applied in all the three cases?
2.Is it OK to return a temporary like in the above code? I believe it is OK since I am returning it by value rather than returning any reference to it.
Any thoughts?
std::string get_a_string()
{
return "hello";
}
std::string get_a_string1()
{
return std::string("hello");
}
std::string get_a_string2()
{ std::string str("hello");
return str;
}
1.Will Return Value Optimization be applied in all the three cases?
2.Is it OK to return a temporary like in the above code? I believe it is OK since I am returning it by value rather than returning any reference to it.
Any thoughts?
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bfzhao 2009-09-08
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应该都会做返回值优化，但是有具名和匿名的区别
这三种类型都合法，根本原因是string具有值语义
这三种类型都合法，根本原因是string具有值语义
