熟悉STL的麻烦请帮下忙

dizengrong 2009-03-29 10:58:12

#include <iostream>
#include <vector>
#include <functional>
#include <cmath>
#include <algorithm>
using namespace std;
template <class OP1,class OP2>
class compose_f_gx : public unary_function<typename OP2::argument_type,typename OP1::result_type>
{
private:
OP1 op1;
OP2 op2;
public:
compose_f_gx(const OP1& o1,const OP2& o2) : op1(o1),op2(o2)
{}
typename OP1::result_type operator() (const typename OP2::argument_type& x) const
{
return op1(op2(x));
}
};
template <class OP1,class OP2>
inline compose_f_gx<OP1,OP2>
compose_f_gx(const OP1& o1,const OP2& o2)
{
return compose_f_gx<OP1,OP2>(o1,o2);
}//在此提示了:error C2904: “compose_f_gx”: 名称已经用于当前范围内的模板
int main()
{
vector<int> coll;
for(int i=0;i<9;i++)
coll.push_back(i+1);
copy(coll.begin(),coll.end(),ostream_iterator<int>(cout," "));
cout<<endl<<endl;
transform(coll.begin(),coll.end(),ostream_iterator<int>(cout," "),compose_f_gx(bind2nd(multiplies<int>(),5),bind2nd(plus<int>(),10)));
cout<<endl;
}]
我这段代码是我从C++标准程序库(Nicolai M.Josuttis著)的第315页摘抄下来的，可编译出错了，
错误如注释所述，麻烦懂得STL的帮我看看，怎么改。

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dizengrong 2009-03-31

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Thank you all,especially Loaden.
You replies are helpful to me!

皮蛋C 2009-03-30

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template <class OP1,class OP2>
inline compose_f_gx <OP1,OP2>::
compose_f_gx(const OP1& o1,const OP2& o2)
{
return compose_f_gx <OP1,OP2>(o1,o2);
}//

compose_f_gx(const OP1& o1,const OP2& o2) : op1(o1),op2(o2)
{} 这里就不要在实现了,直接声明即可.compose_f_gx(const OP1& o1,const OP2& o2);

老邓 2009-03-30

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#include <iostream>

#include <vector>

#include <functional>

#include <cmath>

#include <algorithm>

using namespace std;

template <class OP1, class OP2>

class compose_f_gx : public unary_function <typename OP2::argument_type, typename OP1::result_type>

{

private:

    OP1 op1;

    OP2 op2;

public:

    compose_f_gx(const OP1& o1, const OP2& o2) : op1(o1), op2(o2)

    {}

    typename OP1::result_type operator()(const typename OP2::argument_type& x) const

    {

        return op1(op2(x));

    }

};



template <typename OP1, typename OP2>

inline compose_f_gx <OP1, OP2> compose_f_gx2(const OP1& o1, const OP2& o2)

{

    return compose_f_gx<OP1, OP2>(o1, o2);

}//在此提示了:error C2904: “compose_f_gx”: 名称已经用于当前范围内的模板



int main()

{

    vector <int> coll;

    for (int i = 0;i < 9;i++)

        coll.push_back(i + 1);

    copy(coll.begin(), coll.end(), ostream_iterator <int>(cout, "  "));

    cout << endl << endl;

    transform(coll.begin(), coll.end(), ostream_iterator <int>(cout, "  "), compose_f_gx2(bind2nd(multiplies <int>(), 5), bind2nd(plus <int>(), 10)));

    cout << endl;

}