Joao Matos
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
#pragma once
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#include "function_detail.h"
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namespace fastsignals
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{
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// Derive your class from not_directly_callable to prevent function from wrapping it using its template constructor
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// Useful if your class provides custom operator for casting to function
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struct not_directly_callable
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{
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};
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template <class Fn, class Function, class Return, class... Arguments>
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using enable_if_callable_t = typename std::enable_if_t<
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!std::is_same_v<std::decay_t<Fn>, Function> && !std::is_base_of_v<not_directly_callable, std::decay_t<Fn>> && std::is_same_v<std::invoke_result_t<Fn, Arguments...>, Return>>;
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template <class Signature>
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class function;
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// Compact function class - causes minimal code bloat when compiled.
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// Replaces std::function in this library.
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template <class Return, class... Arguments>
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class function<Return(Arguments...)>
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{
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public:
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function() = default;
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function(const function& other) = default;
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function(function&& other) noexcept = default;
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function& operator=(const function& other) = default;
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function& operator=(function&& other) noexcept = default;
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template <class Fn, typename = enable_if_callable_t<Fn, function<Return(Arguments...)>, Return, Arguments...>>
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function(Fn&& function) noexcept(detail::is_noexcept_packed_function_init<Fn, Return, Arguments...>)
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{
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m_packed.init<Fn, Return, Arguments...>(std::forward<Fn>(function));
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}
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Return operator()(Arguments&&... args) const
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{
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auto& proxy = m_packed.get<Return(Arguments...)>();
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return proxy(std::forward<Arguments>(args)...);
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}
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detail::packed_function release() noexcept
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{
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return std::move(m_packed);
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}
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private:
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detail::packed_function m_packed;
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};
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} // namespace fastsignals
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