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Question #279 Difficulty:
According to the C++17 standard, what is the output of this program?
#include <iostream>
#include <variant>
struct C
{
C() : i(1){}
int i;
};
struct D
{
D() : i(2){}
int i;
};
int main()
{
const std::variant<C,D> v;
std::visit([](const auto& val){ std::cout << val.i; }, v);
}
Hint:
std::variant
s default constructor constructs a variant holding the value-initialized value of the first alternative.
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