count.hpp

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#ifndef EAGINE_COUNT_HPP
#define EAGINE_COUNT_HPP
 
namespace eagine {
 
template <typename Int = int>
class count_t {
public:
    using value_type = Int;
 
    constexpr count_t() noexcept = default;
 
    constexpr value_type value() const noexcept {
        return _c;
    }
 
    constexpr operator value_type() const noexcept {
        return _c;
    }
 
    template <typename... P>
    constexpr void operator()(const P&...) noexcept {
        ++_c;
    }
 
private:
    Int _c{Int(0)};
};
 
} // namespace eagine
 
#endif // EAGINE_COUNT_HPP