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Question #326 Difficulty: 1

According to the C++23 standard, what is the output of this program? 

    #include <iostream>

struct S;

S foo(S s); // S has only been forward declared at this point

struct S{};

S foo(S s) { return {}; }

int main(){
    const S s = foo(S{});
    std::cout << "ok";
}

Hint:

No-one needs to instantiate the parameter types or return type at the point of function declaration.

Answer:

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