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#pragma once
#include <type_traits>
namespace floormat {
template<typename F>
class emplacer {
F fun;
using type = std::decay_t<decltype(std::declval<F>()())>;
public:
explicit constexpr emplacer(F&& fun) noexcept : fun{std::forward<F>(fun)} {}
constexpr operator type() const noexcept { return fun(); }
};
} // namespace floormat
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