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92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
#ifndef LLARP_UTIL_MEMFN
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#define LLARP_UTIL_MEMFN
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#include <util/memfn_traits.hpp>
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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 Obj >
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struct MemFnDereference
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{
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// clang-format off
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static inline Obj& derefImp(Obj& obj, std::false_type)
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{
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return obj;
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}
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template < typename Type >
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static inline Obj& derefImp(Type& obj, std::true_type)
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{
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return *obj;
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}
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template < typename Type >
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static inline Obj& derefImp(const Type& obj, std::true_type)
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{
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return *obj;
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}
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template < typename Type >
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static inline Obj& deref(Type& obj)
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{
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return derefImp(obj, traits::is_pointy< Type >());
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}
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template < typename Type >
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static inline Obj& deref(const Type& obj)
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{
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return derefImp(obj, traits::is_pointy< Type >());
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}
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// clang-format on
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};
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template < typename Prototype, typename Instance >
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class MemFn
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{
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using traits = MemFnTraits< Prototype >;
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static_assert(traits::IsMemFn, "");
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public:
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using result_type = typename traits::result_type;
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private:
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Prototype m_func;
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object::Proxy< Instance > m_instance;
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using Deref = MemFnDereference< typename traits::class_type >;
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public:
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MemFn(Prototype prototype, const Instance& instance)
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: m_func(prototype), m_instance(instance)
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{
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}
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template < typename... Args >
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result_type
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operator()(Args&&... args) const
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{
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return (Deref::deref(m_instance.value())
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.*m_func)(std::forward< Args >(args)...);
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}
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};
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template < typename Prototype, typename Instance >
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MemFn< Prototype, Instance >
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memFn(Prototype prototype, const Instance& instance)
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{
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return MemFn< Prototype, Instance >(prototype, instance);
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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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