c – std :: vector error C2582：’operator =’函数不可用

发布时间：2020-12-16 06:47:04 所属栏目：百科来源：网络整理

导读：我使用简单的向量push_back到类型A的对象并得到这个错误, 这是我的代码： class A { public: A(int a,int b,int c);};#include "A.h"................std::vectorA* vec_objects = new std::vectorA();while(....some condition ...) { A a(1,2,3) vec_obje

我使用简单的向量push_back到类型A的对象
并得到这个错误,
这是我的代码：

class A 
{
    public:
    A(int a,int b,int c);
};


#include "A.h"
....
....
....
....
std::vector<A>* vec_objects = new std::vector<A>();

while(....some condition ...) 
{

    A a(1,2,3)
    vec_objects->push_back(a);
}

收到此错误：

c:program filesmicrosoft visual studio 9.0vcincludexutility(3159) : error C2582: 'operator =' function is unavailable in 'A'
1>        c:program filesmicrosoft visual studio 9.0vcincludexutility(3187) : see reference to function template instantiation 'void std::_Fill<A*,_Ty>(_FwdIt,_FwdIt,const _Ty &)' being compiled
1>        with
1>        [
1>            _Ty=A,1>            _FwdIt=A *
1>        ]
1>        c:program filesmicrosoft visual studio 9.0vcincludevector(1231) : see reference to function template instantiation 'void std::fill<A*,1>            _FwdIt=A *
1>        ]
1>        c:program filesmicrosoft visual studio 9.0vcincludevector(1153) : while compiling class template member function 'void std::vector<_Ty>::_Insert_n(std::_Vector_const_iterator<_Ty,_Alloc>,unsigned int,const _Ty &)'
1>        with
1>        [
1>            _Ty=A,1>            _Alloc=std::allocator<A>
1>        ]
1>

我做错了什么？

解决方法

您需要将operator =和copy-constructor添加到A类

class A 
{
    public:
    A(int a,int c);
    A(const A& element);
    A& operator=(const A& element);     //which needs definition
};

（编辑：李大同）

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