Does returning by const value affect return value optimization? [duplicate]

问题

This question already has answers here:

Can a C++ compiler perform RVO for a const return value? (1 answer)

Purpose of returning by const value? [duplicate] (4 answers)

Closed 5 years ago.

Consider the function

const std::string f()
{
    return "hello";
}

And the call

std::string x = f();

Regardless of whether value return types should be const or not, does the fact the return value is const, prevent a compiler from performing return value optimization?

My understanding of RVO is that the returned object is constructed directly into the variable outside the function. However, if the return type is const T, this isn't the same as a T, so will RVO be prevented?

来源：https://stackoverflow.com/questions/25360617/does-returning-by-const-value-affect-return-value-optimization