ISO C++禁止声明“Stack”；没有类型
我下面有一个堆栈结构的头文件。我不明白的是这个错误困扰着我：
ISO C++ 禁止声明没有类型的“Stack”
这是代码：
#include <stdexcept>
class Element;
class Stack{
public:
Stack():first(0){}; //constructor
~Stack(); //destructor
void push(int d);
int pop()throw(length_error);
bool empty();
private:
Element *first;
Stack(const& Stack){}; //copy constructor
Stack& operator = (const& Stack){}; //assignment operator..
};
有人知道错误的含义吗？
I have below a header file for a stack structure. what I don't understand is this error it is jamming at me:
ISO C++ forbids declaration of 'Stack' with no type
Here's the code :
#include <stdexcept>
class Element;
class Stack{
public:
Stack():first(0){}; //constructor
~Stack(); //destructor
void push(int d);
int pop()throw(length_error);
bool empty();
private:
Element *first;
Stack(const& Stack){}; //copy constructor
Stack& operator = (const& Stack){}; //assignment operator..
};
does anyone have a clue what the error means?
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堆栈&运算符 = (const& Stack)应该是Stack&运算符 = (const Stack&)。您不能有指向引用或引用数组或任何内容的指针，因此编译器认为
&必须结束声明的类型部分，并且以下Stack必须是参数名称。但是const&中没有类型，因此编译器表示您不能声明没有类型的参数Stack。在旧版本的 C 中，有时会在可能出现类型但被省略的上下文中推断出类型int，这就是为什么该错误谈到 ISO C++ 禁止这样做。Stack& operator = (const& Stack)should beStack& operator = (const Stack&).You can't have a pointer to a reference or an array of references or anything so the compiler thinks that
&must end the type part of the declaration and that the followingStackmust be the parameter name. However there's no type inconst&so the compiler says that you can't declare the parameterStackwith no type. In old versions of C the typeintwas sometimes inferred in contexts where a type could appear but was omitted which is why the error talks about ISO C++ forbidding this.