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std::variant::emplace

std::variant::emplace

template <class T, class... Args>
T& emplace(Args&&... args);
 (1) (since C++17) 
template <class T, class U, class... Args>
T& emplace(std::initializer_list<U> il, Args&&... args);
 (2) (since C++17) 
template <size_t I, class... Args>
std::variant_alternative_t<I, variant>& emplace(Args&&... args);
 (3) (since C++17) 
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