no_discard.hpp

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#pragma once
 
#include <utility>
 
namespace rsl {
 
template <typename Fn>
class NoDiscard {
    static_assert(std::is_invocable_v<Fn()>, "Fn must be invocable");
    Fn fn_;
 
   public:
    NoDiscard(Fn const& fn) : fn_(fn) {}
    template <typename... Ts>
    [[nodiscard]] constexpr auto operator()(Ts&&... args) const
        noexcept(noexcept(fn_(std::forward<Ts>(args)...))) {
        return fn_(std::forward<Ts>(args)...);
    }
};
 
}  // namespace rsl