C ++：“错误C4430：缺少类型说明符 - 假设为int”对于构造函数和析构函数的无效声明

Question

I have this CResources class declaration, and i get this error

"error C4430: missing type specifier - int assumed"

#include <set>
#include <unordered_set>


const int R_NUMBER = 5;

typedef enum {
    M,

} OBJECT_ENUM;


typedef enum {
    FILE_O,

} RESOURCE_ENUM;

typedef struct _resourcesMapping {
    CBuffer apiBuffer;
    int ObjectIndex;
};
    class CResources {
        int rCount;
        int* resources;

    public:
        CResources(int);
        ~CResources();
        int getCount();
        int getObjectsCount();
        int rOrder[R_NUMBER];
        std::set<int> ObjectsSet;
    };

What am I doing wrong?

Add the code before the deceleration.

Answer 1

You forgot to #include <set> .

AFTER EDIT

On line 18: CBuffer apiBuffer; , the identifier CBuffer is unknown. Also, the typedef on typedef struct _resourcesMapping is ignored since you didn't declare anything.

Also, identifiers that begin with underscores are reserved in the global namespace and shouldn't be used _resourcesMapping .

Answer 2

typedef struct _resourcesMapping {
    CBuffer apiBuffer;
    int ObjectIndex;
}; //missing typedef name

it should be something like:

typedef struct _resourcesMapping {
    CBuffer apiBuffer;
    int ObjectIndex;
}ResourcesMapping;

Other than that, I don't think there are any errors. Your error seems to be elsewhere.

Answer 3

I think you need just:

using namespace std;

It helped me anyway.

Answer 4

Generally use of "using namespace xxx;" is a bad idea. It might cause problems later on. An example where it will be causing problems is shown below.

void functionX();

namespace mynamespace { 
  void functionX();
};

I recommend that prefixing is used instead such as

mynamespace::functionX();
functionX();

Hth