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108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
#ifndef LLARP_UTIL_MEMFN_TRAITS
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#define LLARP_UTIL_MEMFN_TRAITS
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#include <util/object.hpp>
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#include <util/traits.hpp>
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#include <functional>
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#include <utility>
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namespace llarp
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{
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namespace util
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{
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template < typename Prototype, typename TestPrototype >
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struct MemFnTraitsImpl;
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template < typename Prototype >
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struct MemFnTraits : public MemFnTraitsImpl< Prototype, Prototype >
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{
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};
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template < typename Prototype, typename Return, typename Type,
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typename... Args >
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class MemFnTraitsClass
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{
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using NonCVTag = traits::Tag< 0 >;
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using ConstTag = traits::Tag< 1 >;
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using VolTag = traits::Tag< 2 >;
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using ConstVolTag = traits::Tag< 3 >;
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// clang-format off
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static constexpr NonCVTag test(Return (Type::*)(Args...));
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static constexpr ConstTag test(Return (Type::*)(Args...) const);
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static constexpr VolTag test(Return (Type::*)(Args...) volatile);
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static constexpr ConstVolTag test(Return (Type::*)(Args...) const volatile);
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// clang-format on
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public:
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static constexpr bool IsConst =
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((sizeof((test)((Prototype)0)) - 1) & 1) != 0;
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static constexpr bool IsVolatile =
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((sizeof((test)((Prototype)0)) - 1) & 2) != 0;
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using ctype = std::conditional_t< IsConst, const Type, Type >;
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using type = std::conditional_t< IsVolatile, volatile ctype, ctype >;
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};
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template < typename Prototype, typename Return, typename Type,
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typename... Args >
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struct MemFnTraitsImpl< Prototype, Return (Type::*)(Args...) >
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{
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static constexpr bool IsMemFn = true;
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using class_type =
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typename MemFnTraitsClass< Prototype, Return, Type, Args... >::type;
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using result_type = Return;
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};
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template < typename Prototype, typename Return, typename Type,
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typename... Args >
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struct MemFnTraitsImpl< Prototype, Return (Type::*)(Args...) const >
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{
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static constexpr bool IsMemFn = true;
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using class_type =
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typename MemFnTraitsClass< Prototype, Return, Type, Args... >::type;
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using result_type = Return;
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};
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template < typename Prototype, typename Return, typename Type,
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typename... Args >
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struct MemFnTraitsImpl< Prototype, Return (Type::*)(Args...) volatile >
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{
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static constexpr bool IsMemFn = true;
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using class_type =
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typename MemFnTraitsClass< Prototype, Return, Type, Args... >::type;
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using result_type = Return;
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};
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template < typename Prototype, typename Return, typename Type,
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typename... Args >
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struct MemFnTraitsImpl< Prototype,
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Return (Type::*)(Args...) const volatile >
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{
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static constexpr bool IsMemFn = true;
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using class_type =
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typename MemFnTraitsClass< Prototype, Return, Type, Args... >::type;
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using result_type = Return;
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};
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template < typename Prototype, typename TestPrototype >
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struct MemFnTraitsImpl
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{
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static constexpr bool IsMemFn = false;
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using result_type = void;
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using class_type = void;
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};
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} // namespace util
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} // namespace llarp
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#endif
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