QxOrm  1.4.4
C++ Object Relational Mapping library
is_ptr_base_of.h
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00031 
00032 #ifndef _QX_IS_PTR_BASE_OF_H_
00033 #define _QX_IS_PTR_BASE_OF_H_
00034 
00035 #ifdef _MSC_VER
00036 #pragma once
00037 #endif
00038 
00046 namespace qx {
00047 namespace trait {
00048 
00053 template <typename B, typename D>
00054 class is_ptr_base_of
00055 {
00056 
00057 private:
00058 
00059    template <typename V, typename W>
00060    static typename std::conditional<std::is_base_of<V, W>::value, char, int>::type removePtr(const volatile V * const volatile, const volatile W * const volatile);
00061 
00062    static int removePtr(...);
00063    static B b;
00064    static D d;
00065 
00066 public:
00067 
00068    enum { value = (std::is_pointer<B>::value && std::is_pointer<D>::value && (sizeof(qx::trait::is_ptr_base_of<B, D>::removePtr(b, d)) == sizeof(char))) };
00069 
00070    typedef typename std::conditional<qx::trait::is_ptr_base_of<B, D>::value, std::true_type, std::false_type>::type type;
00071 
00072 };
00073 
00074 } // namespace trait
00075 } // namespace qx
00076 
00077 #endif // _QX_IS_PTR_BASE_OF_H_