41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
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#pragma once
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#include <tuple>
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#include <type_traits>
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namespace sqlite
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{
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namespace utility
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{
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template <typename> struct function_traits;
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template <typename Function>
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struct function_traits : public function_traits<decltype(&std::remove_reference<Function>::type::operator())>
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{
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};
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template <typename ClassType, typename ReturnType, typename... Arguments>
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struct function_traits<ReturnType (ClassType::*)(Arguments...) const> : function_traits<ReturnType (*)(Arguments...)>
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{
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};
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/* support the non-const operator ()
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* this will work with user defined functors */
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template <typename ClassType, typename ReturnType, typename... Arguments>
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struct function_traits<ReturnType (ClassType::*)(Arguments...)> : function_traits<ReturnType (*)(Arguments...)>
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{
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};
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template <typename ReturnType, typename... Arguments> struct function_traits<ReturnType (*)(Arguments...)>
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{
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typedef ReturnType result_type;
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template <std::size_t Index> using argument = typename std::tuple_element<Index, std::tuple<Arguments...>>::type;
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static const std::size_t arity = sizeof...(Arguments);
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};
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} // namespace utility
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} // namespace sqlite
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