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Question #158 Difficulty: 1

According to the C++17 standard, what is the output of this program? 

    #include <iostream>
#include <vector>

struct Foo
{
    Foo() { std::cout<<"a"; }
    Foo(const Foo&) { std::cout<<"b"; }
};

int main()
{
    std::vector<Foo> bar(5);
}

Hint:

Which vector constructor will be called?

Answer:

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