function_traits.h

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/******************************************************************************
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Embedded Template Library.
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Copyright(c) 2025 John Wellbelove
 
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#ifndef ETL_FUNCTION_TRAITS_INCLUDED
#define ETL_FUNCTION_TRAITS_INCLUDED
 
#include "platform.h"
#include "type_list.h"
#include "type_traits.h"
 
#if ETL_USING_CPP11
namespace etl
{
  //***************************************************************************
  //***************************************************************************
  template <typename T>
  struct function_traits;
 
  //***************************************************************************
  //***************************************************************************
  template <typename TReturn, typename... TArgs>
  struct function_traits<TReturn(*)(TArgs...)>
  {
    using function_type  = TReturn(TArgs...);                    
    using return_type    = TReturn;                              
    using object_type    = void;                                 
    using argument_types = etl::type_list<TArgs...>;             
 
    static constexpr bool is_function        = true;             
    static constexpr bool is_member_function = false;            
    static constexpr bool is_const           = false;            
    static constexpr size_t argument_count   = sizeof...(TArgs); 
  };
 
  template <typename TReturn, typename... TArgs>
  constexpr bool function_traits<TReturn(*)(TArgs...)>::is_function;
 
  template <typename TReturn, typename... TArgs>
  constexpr bool function_traits<TReturn(*)(TArgs...)>::is_member_function;
 
  template <typename TReturn, typename... TArgs>
  constexpr bool function_traits<TReturn(*)(TArgs...)>::is_const;
 
  template <typename TReturn, typename... TArgs>
  constexpr size_t function_traits<TReturn(*)(TArgs...)>::argument_count;
 
  //***************************************************************************
  //***************************************************************************
  template <typename TReturn, typename TObject, typename... TArgs>
  struct function_traits<TReturn(TObject::*)(TArgs...)>
  {
    using function_type  = TReturn(TArgs...);                    
    using return_type    = TReturn;                              
    using object_type    = TObject;                              
    using argument_types = etl::type_list<TArgs...>;             
 
    static constexpr bool is_function        = false;            
    static constexpr bool is_member_function = true;             
    static constexpr bool is_const           = false;            
    static constexpr size_t argument_count   = sizeof...(TArgs); 
  };
 
  template <typename TReturn, typename TObject, typename... TArgs>
  constexpr bool function_traits<TReturn(TObject::*)(TArgs...)>::is_function;
 
  template <typename TReturn, typename TObject, typename... TArgs>
  constexpr bool function_traits<TReturn(TObject::*)(TArgs...)>::is_member_function;
 
  template <typename TReturn, typename TObject, typename... TArgs>
  constexpr bool function_traits<TReturn(TObject::*)(TArgs...)>::is_const;
 
  template <typename TReturn, typename TObject, typename... TArgs>
  constexpr size_t function_traits<TReturn(TObject::*)(TArgs...)>::argument_count;
 
  //***************************************************************************
  //***************************************************************************
  template <typename TReturn, typename TObject, typename... TArgs>
  struct function_traits<TReturn(TObject::*)(TArgs...) const>
  {
    using function_type  = TReturn(TArgs...);                    
    using return_type    = TReturn;                              
    using object_type    = TObject;                              
    using argument_types = etl::type_list<TArgs...>;             
 
    static constexpr bool is_function        = false;            
    static constexpr bool is_member_function = true;             
    static constexpr bool is_const           = true;             
    static constexpr size_t argument_count   = sizeof...(TArgs); 
  };
 
  template <typename TReturn, typename TObject, typename... TArgs>
  constexpr bool function_traits<TReturn(TObject::*)(TArgs...) const>::is_function;
 
  template <typename TReturn, typename TObject, typename... TArgs>
  constexpr bool function_traits<TReturn(TObject::*)(TArgs...) const>::is_member_function;
 
  template <typename TReturn, typename TObject, typename... TArgs>
  constexpr bool function_traits<TReturn(TObject::*)(TArgs...) const>::is_const;
 
  template <typename TReturn, typename TObject, typename... TArgs>
  constexpr size_t function_traits<TReturn(TObject::*)(TArgs...) const>::argument_count;
}
#endif
 
#endif