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问题描述

我刚开始用c ++开始编码,也许我在这里遗漏了一些语法上很明显的东西,但是我现在已经搜索了很长时间,并且无法在任何地方找到我的问题的参考。我正在尝试为 set multiset 创建自定义C ++类。

I just started coding in c++ after a long while, and perhaps I am missing something syntactically obvious here, but I have searched for good long while now and can't find a reference to my problem anywhere. I am trying to create a custom C++ class for set and multiset.

这是我的班级 cset.h

#pragma once
#include <set>
#include "cmultiset.h"

template <class Type>

class Set : public set<Type>
{
private:

public:
    void add(Type &);
};

这是我的 cmultiset.h

#pragma once
#include <set>

template <class Type>

class MultiSet : public multiset<Type>
{
private:

public:
    bool operator < (MultiSet <Type> &);
};

我在这里要做的是创建一个 Set< MultiSet< int> ;> 在我的驱动程序类中。但是对于每个文件而言,在类的上述头文件中得到以下错误两次:set set:public< Type> class MultiSet:public multiset<输入>

What I am trying to do here is create a Set<MultiSet<int>> in my driver class. But get the following error twice for each file instead in the above header files at class Set : public set<Type> and class MultiSet : public multiset<Type>.

syntax error: missing ',' before '<'

我不知道如何解决此错误。

I don't know how to resolve this error.

如果我只使用 set< MultiSet< int>> 一切正常:没有错误没有警告(我必须添加使用命名空间std; 在模板之前)。但是,当我使用 Set< MultiSet< int>> 时,它会给出错误,使用命名空间std 不起作用。

If I use just set<MultiSet<int>> everything works fine: No Errors no warnings (I do have to add using namespace std; before the template). However when I use Set<MultiSet<int>> it gives the error and using namespace std doesn't work.

编辑1:

错误:

Severity    Code    Description Project File    Line    Suppression State
Error   C2143   syntax error: missing ',' before '<'    Integer Sets Analyzer   c:\users\abbas\documents\mega\personal projects\integer sets analyzer\integer sets analyzer\cmultiset.h 6
Error   C2143   syntax error: missing ',' before '<'    Integer Sets Analyzer   c:\users\abbas\documents\mega\personal projects\integer sets analyzer\integer sets analyzer\cmultiset.h 6
Error   C2143   syntax error: missing ',' before '<'    Integer Sets Analyzer   c:\users\abbas\documents\mega\personal projects\integer sets analyzer\integer sets analyzer\cset.h  7
Error   C2143   syntax error: missing ',' before '<'    Integer Sets Analyzer   c:\users\abbas\documents\mega\personal projects\integer sets analyzer\integer sets analyzer\cmultiset.h 6
Error   C2143   syntax error: missing ',' before '<'    Integer Sets Analyzer   c:\users\abbas\documents\mega\personal projects\integer sets analyzer\integer sets analyzer\cset.h  7

编辑2:

这是我的 main.cpp

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
#include <conio.h>
#include "cmultiset.h"
#include "cset.h"

using namespace std;

int main()
{
    Set<MultiSet <int>> intSet;

    intSet.clear();

    _getch();

    return 0;
}

这是我的 MultiSet.cpp

#pragma once
#include "stdafx.h"
#include "cmultiset.h"

using namespace std;

template <class Type>
bool MultiSet<Type>::operator < (MultiSet<Type> & cmpSet)
{
    if (this->size() < cmpSet.size())
    {
        return true;
    }
    else if (this->size() > cmpSet.size())
    {
        return false;
    }

    for (multiset<Type>::iterator it = this->begin(), jt = cmpSet.begin(); it != this->end(), jt != cmpSet.end(); ++it, ++jt)
    {
        if (*it < *jt)
            return true;
    }

    return false;
}

这是我的 Set.cpp

#pragma once
#include "stdafx.h"
#include "cset.h"

using namespace std;

template <class Type>
void Set<Type> :: add(Type & entry)
{
    set<Type>::insert(entry);
}


推荐答案

class Set:public set< Type> ,它应该是 std :: set 而不是 set

编译器给出语法错误,否则因为它没有实现 set 是一个类模板。

The compiler gives a syntax error otherwise because it doesn't realize set is a class template.

下一部分 multiset 存在类似问题。

There is a similar problem with multiset in the next part.

NB。标准容器不是要继承的;考虑使用包容(即将容器作为成员变量)。

NB. Standard containers are not meant to be inherited from; consider using containment instead (i.e. have the container as a member variable).

这篇关于语法错误:在'&lt;'之前缺少','的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-12 02:34