C++

16.6    Copy

Let's make a small change to the definition of function in Listing 16.13: pass the parameter by value instead of as a constant reference. As you know, this will copy the object for the function. The rest of the program remains the same.

// https://godbolt.org/z/3T869arc8void function(MyValue paramValue) {    std::cout << "(function)\n";    MyValue localValue{"local"};}int main() {    MyValue mvalue1{"mvalue1"};    function( MyValue{"temp"} );    function( mvalue1 );    {        MyValue mvalue2{"mvalue2"};    }}  

Listing 16.13     Passing by value creates objects with the compiler-generated copy constructor.

I added the output of (function) just for orientation; it has nothing to do with the lifetime of the instances.

There is something strange to see in the ...