C++for_each函数的使用

2012-10-28 12:37:24 2k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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c++ 标准模板库 STL 算法之 for_each 函数的使用用法详解 std::for_each template Function for_each (InputIterator first, InputIterator last, Function fn); Apply function to range Applies function fn to each of the elements in the range [first,las 阅读详情

一个简单的复数类
class Complex{
int rec;
int vir;
public:
Complex(int r=0,int v=0){
rec=r;vir=v;
}
friend ostream&operator<<(ostream &os,const Complex&com);
friend class ComplexAdd;
};

ostream&operator<<(ostream&os,const Complex&com){
os<<"("<<com.rec<<","<<com.vir<<")"<<endl;
return os;
}
类实现复数的加
class ComplexAdd{
Complex com;
public:
ComplexAdd(int a,int b){
com.rec+=a;com.vir+=b;
}
};
以下是主函数里的
Complex A[] = { Complex(1, 2), Complex(3, 4), Complex(5, 6), Complex(7, 8), Complex(9, 10)};
vector<Complex> aa(A, A + 5);
for_each(aa.begin(), aa.end(), ComplexAdd(2,3));
for_each(A, A+10, ComplexAdd(5,6));
vector<Complex>::iterator p;
for ( p = aa.begin(); p != aa.end(); p++)
cout << *p;
cout << endl;
int i;
for (i = 0; i < 5; i++)
cout << A[i];

界面上已经显示语法无误。
但是编译的时候显示错误:项不会计算为接受1个参数的函数
错误指向for_each函数的源代码
template<class _InIt,class _Fn1>
inline _Fn1 _For_each(_InIt _First, _InIt _Last, _Fn1 _Func)
{ // perform function for each element
for (; _First != _Last; ++_First)
_Func(*_First);
return (_Func);
}

这什么情况？

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