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c++temporary-objects

c++ Temporary object question

Is there a difference in the number of temp objects created between these 2 functions?

string foo1() {
    return "";
} 

string foo2() {
    string s = "";
    return s;
}

This is a homework question so please assume there is no compiler optimization.

Solution

  • No- only one temporary is created. The object on the stack of the function is not a temporary, it is an lvalue. The string literal is also an lvalue. Both involve exactly the same process- returning a string constructed from an lvalue.