1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
| //stdFunctionalExtention.h
#ifndef STDFUNCTIONALEXTENTION_H_INCLUDED
#define STDFUNCTIONALEXTENTION_H_INCLUDED
#include <iostream>
/**
* A functor class who call a functor depending of it first template parameter
* All is done at compile time
*/
namespace std
{
template <bool expression,class RetType, class TrueFunctor,class FalseFunctor>
struct is_true
{
inline RetType operator()() const;
};
///True generic case
template <class RetType,class TrueFunctor, class FalseFunctor>
struct is_true<true,RetType,TrueFunctor,FalseFunctor>
{
TrueFunctor t;
inline RetType operator()() const
{
t();
}
};
///False Generic case
template <class RetType,class TrueFunctor, class FalseFunctor>
struct is_true<false,RetType,TrueFunctor,FalseFunctor>
{
FalseFunctor f;
inline RetType operator()() const
{
f();
}
};
///void RetType True case
template <class TrueFunctor, class FalseFunctor>
struct is_true<true,void,TrueFunctor,FalseFunctor>
{
TrueFunctor t;
inline void operator()() const
{
t();
}
};
///void RetType False case
template <class TrueFunctor, class FalseFunctor>
struct is_true<false,void,TrueFunctor,FalseFunctor>
{
FalseFunctor f;
inline void operator()() const
{
f();
}
};
}
#endif // STDFUNCTIONALEXTENTION_H_INCLUDED
#endif // STDFUNCTIONALEXTENTION_H_INCLUDED |
Partager