Ошибка c2064 результатом вычисления фрагмента не является функция принимающая 1 аргументов - Исправление ошибок и поиск оптимальных решений проблем

class Student {
    // ...
    bool Graduate() { return m_bGraduate; }
    // ...
};

class School {
    vector<Student*> m_vecStudents;

    void DelAndNullify(Student* &pStd);
    void Fun1();
};

void School::DelAndNullify(Student* &pStd)
{
    if ( (pStd != NULL) && (pStd->Graduate()) )
    {
        delete pStd;
        pStd = NULL;
    }
}

void School::Fun1()
{
    for_each(m_vecStudents.begin(), m_vecStudents.end(), mem_fun(&School::DelAndNullify));
}

Error 1 error C2064: term does not evaluate to a function taking 1 arguments C:Program FilesMicrosoft Visual Studio 10.0VCincludealgorithm 22 1 Simulation

Why do I get this error?

updated

change Student to pStd

updated // algorithm file

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); // <<<<<<<< this line!
    return (_Func);
}

BTW, if I define the DelAndNullify as static then the following line passes the compiler

for_each(m_vecStudents.begin(), m_vecStudents.end(), ptr_fun(&School::DelAndNullify));

Updated 05/09/2012

#include <string>
#include <fstream>
#include <vector>
#include <algorithm>
#include <iterator>
#include <string>
#include <iostream>
#include <iomanip>
#include <functional>
#include <boost/bind.hpp>

class Student {
public:
    Student(int id, bool bGraduate) : m_iID(id), m_bGraduate(bGraduate) {}
    bool Graduate() const { return m_bGraduate; }
private:
    int  m_iID;
    bool m_bGraduate;
};

class School {
public:
    School(int numStudent)
    {
        for (int i=0; i<numStudent; ++i)
        {
            m_vecStudents.push_back(new Student(i+1, false));
        }
    }

    ~School() 
    {   
        // deallocate the allocated student resource to prevent memory leak!
    }

    void DelAndNullify(Student* &pStd);
    void Fun1();

private:
    std::vector<Student*> m_vecStudents;

};

void School::DelAndNullify(Student* &pStd)
{
    if ( (pStd != NULL) && (!pStd->Graduate()) )
    {
        delete pStd;
        pStd = NULL;
    }
}

void School::Fun1()
{   // http://stackoverflow.com/questions/6065041/error-c2064-term-does-not-evaluate-to-a-function-taking-1-arguments
    std::for_each(m_vecStudents.begin(), m_vecStudents.end(), std::bind1st(std::mem_fun(&School::DelAndNullify), this));
    //boost::bind(&School::DelAndNullify, this, _1);
}

int main(int /*argc*/, char* /*argv*/[])
{
    School school(10);
    school.Fun1();
    return 0;
}

Error 1 error C2535: ‘void std::binder1st<_Fn2>::operator ()(Student
*&) const’ : member function already defined or declared c:Program FilesMicrosoft Visual Studio 10.0VCincludexfunctional 299

Источник

class Student {
    // ...
    bool Graduate() { return m_bGraduate; }
    // ...
};

class School {
    vector<Student*> m_vecStudents;

    void DelAndNullify(Student* &pStd);
    void Fun1();
};

void School::DelAndNullify(Student* &pStd)
{
    if ( (pStd != NULL) && (pStd->Graduate()) )
    {
        delete pStd;
        pStd = NULL;
    }
}

void School::Fun1()
{
    for_each(m_vecStudents.begin(), m_vecStudents.end(), mem_fun(&School::DelAndNullify));
}

Error 1 error C2064: term does not evaluate to a function taking 1 arguments C:Program FilesMicrosoft Visual Studio 10.0VCincludealgorithm 22 1 Simulation

Why do I get this error?

updated

change Student to pStd

updated // algorithm file

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); // <<<<<<<< this line!
    return (_Func);
}

BTW, if I define the DelAndNullify as static then the following line passes the compiler

for_each(m_vecStudents.begin(), m_vecStudents.end(), ptr_fun(&School::DelAndNullify));

Updated 05/09/2012

#include <string>
#include <fstream>
#include <vector>
#include <algorithm>
#include <iterator>
#include <string>
#include <iostream>
#include <iomanip>
#include <functional>
#include <boost/bind.hpp>

class Student {
public:
    Student(int id, bool bGraduate) : m_iID(id), m_bGraduate(bGraduate) {}
    bool Graduate() const { return m_bGraduate; }
private:
    int  m_iID;
    bool m_bGraduate;
};

class School {
public:
    School(int numStudent)
    {
        for (int i=0; i<numStudent; ++i)
        {
            m_vecStudents.push_back(new Student(i+1, false));
        }
    }

    ~School() 
    {   
        // deallocate the allocated student resource to prevent memory leak!
    }

    void DelAndNullify(Student* &pStd);
    void Fun1();

private:
    std::vector<Student*> m_vecStudents;

};

void School::DelAndNullify(Student* &pStd)
{
    if ( (pStd != NULL) && (!pStd->Graduate()) )
    {
        delete pStd;
        pStd = NULL;
    }
}

void School::Fun1()
{   // http://stackoverflow.com/questions/6065041/error-c2064-term-does-not-evaluate-to-a-function-taking-1-arguments
    std::for_each(m_vecStudents.begin(), m_vecStudents.end(), std::bind1st(std::mem_fun(&School::DelAndNullify), this));
    //boost::bind(&School::DelAndNullify, this, _1);
}

int main(int /*argc*/, char* /*argv*/[])
{
    School school(10);
    school.Fun1();
    return 0;
}

Error 1 error C2535: ‘void std::binder1st<_Fn2>::operator ()(Student
*&) const’ : member function already defined or declared c:Program FilesMicrosoft Visual Studio 10.0VCincludexfunctional 299

Источник

Remove From My Forums

Question
Hello ..,
I try make small app in vc++ 2008 and i try it too in vc++ 2005 but it’s the same :(, i use dataSet and code will say what I need too say

1 DataSet^ DataS;

2 array<Object^, 1>^ Info1 = gcnew array<Object^, 1>(4);

3 Info1[0] = DataS->Tables[0]->Rows(DataS->Tables[0]->Rows->Count — 1)[0] + 1;

the error in line 3, I got error C2064: term does not evaluate to a function taking 1 arguments.

AmR EiSa.
- Edited by
  
  Friday, June 6, 2008 7:01 AM
  change ,3 to 3,

Answers

You do need square brackets to index the Rows property. Your next problem is that you are trying to add 1 to an Object^. It helps to break down the statement:

DataRow^ row = DataS->Tables[0]->Rows[DataS->Tables[0]->Rows->Count — 1];
Object^ column = row[0];
int value = (int)column + 1;

Putting it back together:

int value = 1 + (int)(DataS->Tables[0]->Rows[DataS->Tables[0]->Rows->Count — 1][0]);

Hans Passant.
- Proposed as answer by
  AmR EiSa
  Sunday, June 8, 2008 1:25 PM
- Marked as answer by
  Yan-Fei Wei
  Monday, June 9, 2008 7:46 AM

Источник

Remove From My Forums

Question
Hello ..,
I try make small app in vc++ 2008 and i try it too in vc++ 2005 but it’s the same :(, i use dataSet and code will say what I need too say

1 DataSet^ DataS;

2 array<Object^, 1>^ Info1 = gcnew array<Object^, 1>(4);

3 Info1[0] = DataS->Tables[0]->Rows(DataS->Tables[0]->Rows->Count — 1)[0] + 1;

the error in line 3, I got error C2064: term does not evaluate to a function taking 1 arguments.

AmR EiSa.
- Edited by
  
  Friday, June 6, 2008 7:01 AM
  change ,3 to 3,

Answers

You do need square brackets to index the Rows property. Your next problem is that you are trying to add 1 to an Object^. It helps to break down the statement:

DataRow^ row = DataS->Tables[0]->Rows[DataS->Tables[0]->Rows->Count — 1];
Object^ column = row[0];
int value = (int)column + 1;

Putting it back together:

int value = 1 + (int)(DataS->Tables[0]->Rows[DataS->Tables[0]->Rows->Count — 1][0]);

Hans Passant.
- Proposed as answer by
  AmR EiSa
  Sunday, June 8, 2008 1:25 PM
- Marked as answer by
  Yan-Fei Wei
  Monday, June 9, 2008 7:46 AM

Источник

1	DataSet^ DataS;
2	array<Object^, 1>^ Info1 = gcnew array<Object^, 1>(4);
3	Info1[0] = DataS->Tables[0]->Rows(DataS->Tables[0]->Rows->Count — 1)[0] + 1;

updated

updated // algorithm file

Updated 05/09/2012

updated

updated // algorithm file

Updated 05/09/2012

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