C++笔记-一些通用的帮助类/Hack/StopWatch/

 

Hack(访问基类私有变量/函数的访问帮助宏（快速绑定友元类）):

// #include <iostream>
// using namespace std;
namespace Hacker
{
    template<typename Tag, typename Tag::MemType M>
    struct PrivateMemberStealer
    {
        // define friend funtion GetPrivate,return class member pointer
        friend typename Tag::MemType GetPrivate(Tag) { return M; }
    };
}
#define DECL_HACK_PRIVATE_DATA(ClassName,DataType,DataName) namespace Hacker{\
                                                              struct ClassName##_##DataName\
                                                              {\
                                                                typedef DataType ClassName::*MemType;\
                                                                friend MemType GetPrivate(ClassName##_##DataName);\
                                                              };\
                                                              template struct PrivateMemberStealer<ClassName##_##DataName, &ClassName::DataName>;\
                                                            }
#define GET_VAR_PRIVATE_DATA_MEMBER(ClassInstancePointer,ClassName,DataName)    ClassInstancePointer->*GetPrivate(::Hacker::ClassName##_##DataName())
#define GET_REF_PRIVATE_DATA_MEMBER(RefName,ClassInstancePointer,ClassName,DataName)    auto& RefName = ClassInstancePointer->*GetPrivate(::Hacker::ClassName##_##DataName())


#define DECL_HACK_PRIVATE_NOCONST_FUNCTION(ClassName,MemberName,ReturnType,...) \
        namespace Hacker{\
            struct ClassName##_##MemberName \
            {\
                typedef ReturnType (ClassName::*MemType)(__VA_ARGS__);\
                friend MemType GetPrivate(ClassName##_##MemberName);\
            };\
            template struct PrivateMemberStealer<ClassName##_##MemberName, &ClassName::MemberName>;\
        }
#define DECL_HACK_PRIVATE_CONST_FUNCTION(ClassName,MemberName,ReturnType,...) \
        namespace Hacker{\
            struct ClassName##_##MemberName \
            {\
                typedef ReturnType (ClassName::*MemType)(__VA_ARGS__)const;\
                friend MemType GetPrivate(ClassName##_##MemberName);\
            };\
            template struct PrivateMemberStealer<ClassName##_##MemberName, &ClassName::MemberName>;\
        }

// using ADL found to ::Hacker::Getprivate
#define GET_PRIVATE_MEMBER_FUNCTION(ClassName,MemberName) GetPrivate(::Hacker::ClassName##_##MemberName())
#define CALL_MEMBER_FUNCTION(ClassPointer,MemberFuncPointer,...) (ClassPointer->*MemberFuncPointer)(__VA_ARGS__)

#define WRAP_TEMPLATE_ARGS(TEMP_TYPE,...) TEMP_TYPE<__VA_ARGS__>



// class A{
// public:
//     A(int ivalp=0):ival{ivalp}{}
// private:
//     int func(int ival)const
//     {
//         printf("A::func(int)\t%d\n",ival);
//         printf("ival is %d\n",ival);
//         return 0;
//     }
//     int ival;
// };

// DECL_HACK_PRIVATE_DATA(A,int,ival)
// DECL_HACK_PRIVATE_CONST_FUNCTION(A, func, int, int)

// int main()
// {
//     A aobj(789);
//     // get private data member
//     GET_REF_PRIVATE_DATA_MEMBER(ref_ival, &aobj, A, ival);
//     ref_ival=456;
//     cout<<GET_VAR_PRIVATE_DATA_MEMBER(&aobj, A, ival)<<endl;
//     // // call private func
//     auto A_func=GET_PRIVATE_MEMBER_FUNCTION(A, func);
//     cout<<CALL_MEMBER_FUNCTION(&aobj, A_func, 123);
// }

 

 

 

StopWatch(C++计时器):

#include <iostream>
#include <time.h>
struct StopWatch
{
public:

    void Start()
    {
        std::cout << "start time : " << std::endl;
        start = clock_t();
    }

    void Stop()
    {
        clock_t total =  clock_t() - start; //获所用间du
        std::cout << "`end time : " << (double)total / CLK_TCK << std::endl;
    }
private:
    clock_t start;
};

#pragma region Case 
/*
StopWatch sw;
sw.Start();
sw.Stop();
*/
#pragma endregion Case