下面這段代碼編譯罰款與VS2010但並不想用gcc編譯4.6.1:不能用gcc編譯代碼4.6.1
#ifndef IS_CHAR_H_INCLUDED
#define IS_CHAR_H_INCLUDED
#include <type_traits>
template<class Int_T>
struct Is_Char_
{
enum {value = false};
};
template<>
struct Is_Char_<char>
{
enum {value = true};
};
template<>
struct Is_Char_<unsigned char>
{
enum {value = true};
};
template<>
struct Is_Char_<signed char>
{
enum {value = true};
};
template<class Int_T>
struct Is_Char : Is_Char_<typename std::remove_cv<Int_T>::type>
{
};
#endif // IS_CHAR_H_INCLUDED
#ifndef PROMOTE_H_INCLUDED
#define PROMOTE_H_INCLUDED
#include <type_traits>
#include <boost/mpl/vector.hpp>
#include <boost/mpl/find.hpp>
#include <boost/mpl/next.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/end.hpp>
//#include "Is_Char.h" doesn't have to be here this file is pasted above
/*Promotes Integer type to one up in size range*/
template<class Integer>
struct Promote
{
static_assert(std::is_integral<Integer>::value,"Non Integer type is not allowed.");
/*Check correct type - depending on Integer being signed or unsigned*/
typedef typename std::conditional<std::is_signed<Integer>::value,
boost::mpl::vector<signed char,short,int,long,long long>,
boost::mpl::vector<unsigned char,unsigned short,unsigned int,long,long long>
>::type types;
/*
Find this type from the list above - substituting Integer for signed or unsigned char iff Integer is of type char
*/
typedef typename boost::mpl::find<types,
typename std::conditional<Is_Char<Integer>::value,
typename std::conditional<std::is_signed<Integer>::value,signed char,unsigned char>::type, Integer>::type>::type this_type;
/*If Integer is int and if size of it is == to long promote int to long long (iterate to next element twice)*/
typedef typename boost::mpl::eval_if<boost::mpl::bool_<((std::is_same<Integer,int>::value || std::is_same<Integer,unsigned int>::value)
&& (sizeof(int) == sizeof(long)))>,
boost::mpl::next<typename boost::mpl::next<this_type>::type>,
boost::mpl::next<this_type>
>::type next_type;
/*Check if iterator points within range or if one pass end which means that Integer was u/long long*/
typedef typename std::conditional<std::is_same<typename boost::mpl::end<types>::type,next_type>::value,Integer,typename boost::mpl::deref<next_type>::type>::type type;
};
#endif // PROMOTE_H_INCLUDED
請添加錯誤消息。 – Patrick
gcc報告什麼錯誤? –
你能否包含你從編譯器中得到的錯誤? – Ciaran