包含了一个initializer_list头文件,为什么向它的形参传递一个值的序列,把这个序列放在花括号中编译器显示说不对 附:编译器是VS2012
initializer_list 头文件
#pragma once
#ifndef _INITIALIZER_LIST_
#define _INITIALIZER_LIST_
#ifndef RC_INVOKED
#include <cstddef>
#pragma pack(push,_CRT_PACKING)
#pragma warning(push,3)
#pragma push_macro("new")
#undef new
_STD_BEGIN
// TEMPLATE CLASS initializer_list
template<class _Elem>
class initializer_list
{ // list of pointers to elements
public:
typedef _Elem value_type;
typedef const _Elem& reference;
typedef const _Elem& const_reference;
typedef size_t size_type;
typedef const _Elem* iterator;
typedef const _Elem* const_iterator;
initializer_list() _NOEXCEPT
: _First(0), _Last(0)
{ // empty list
}
initializer_list(const _Elem *_First_arg,
const _Elem *_Last_arg) _NOEXCEPT
: _First(_First_arg), _Last(_Last_arg)
{ // construct with pointers
}
const _Elem *begin() const _NOEXCEPT
{ // get beginning of list
return (_First);
}
const _Elem *end() const _NOEXCEPT
{ // get end of list
return (_Last);
}
size_t size() const _NOEXCEPT
{ // get length of list
return ((size_t)(_Last - _First));
}
private:
const _Elem *_First;
const _Elem *_Last;
};
// TEMPLATE FUNCTION begin
template<class _Elem> inline
const _Elem *begin(initializer_list<_Elem> _Ilist) _NOEXCEPT
{ // get beginning of sequence
return (_Ilist.begin());
}
// TEMPLATE FUNCTION end
template<class _Elem> inline
const _Elem *end(initializer_list<_Elem> _Ilist) _NOEXCEPT
{ // get end of sequence
return (_Ilist.end());
}
_STD_END
#pragma pop_macro("new")
#pragma warning(pop)
#pragma pack(pop)
#endif /* RC_INVOKED */
#endif /* _INITIALIZER_LIST_ */
编写一个主函数
#include<iostream>
#include"initializer_list.h"
using namespace std;
void add(initializer_list<int> a)
{
int sum =0;
for(auto beg = a.begin(),end = a.end();beg != end;beg++)
{
sum+=*beg;
}
cout << sum <<endl;
}
void main()
{
add ({2,1,0});
}