构造函数不匹配的参数和参数 [英] constructor mismatch parameter and argument

问题描述

我怀疑CIAlert的构造函数具有多个参数，但是在执行构造函数时，仅传递了一个参数.怎么可能，任何人都可以解释下面的程序如何工作?

----------------------------------------
#ifdef _ASGDLL
#define ASGDLL_EXP __declspec(dllexport)
#else
#define ASGDLL_EXP __declspec(dllimport)
#endif

class ASGDLL_EXP CIAlert
{

// Constructors
public:
    CIAlert(WORD wCategoryParam, LPCTSTR lpszSourceName = PROJECT_ERROR_SOURCE,  LPCTSTR lpszMsgsModuleName = PROJECT_ERROR_MSG_SOURCE);

// Destructors
public:
    virtual ~CIAlert();

}


-----------------------------------------------------

#define C_STOREUPD_MAIN                  ((DWORD)0x000000FAL)

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
    CIAlert alert(C_STOREUPD_MAIN);
    int nRetCode = 0;
}

-------------------------------------------------

解决方案

那是因为所有其他输入参数都具有默认值.

看到这个:
http://www.learncpp.com/cpp-tutorial/85-constructors/ [ ^ ]

I have a doubt that CIAlert has constructor with more than one parameters, but while executing the constructor only one argument is passed. How is it possible , Can any one explain how the below program works?

----------------------------------------
#ifdef _ASGDLL
#define ASGDLL_EXP __declspec(dllexport)
#else
#define ASGDLL_EXP __declspec(dllimport)
#endif

class ASGDLL_EXP CIAlert
{

// Constructors
public:
    CIAlert(WORD wCategoryParam, LPCTSTR lpszSourceName = PROJECT_ERROR_SOURCE,  LPCTSTR lpszMsgsModuleName = PROJECT_ERROR_MSG_SOURCE);

// Destructors
public:
    virtual ~CIAlert();

}


-----------------------------------------------------

#define C_STOREUPD_MAIN                  ((DWORD)0x000000FAL)

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
    CIAlert alert(C_STOREUPD_MAIN);
    int nRetCode = 0;
}

-------------------------------------------------

解决方案

That''s because all of the other input parameters have default values.

See this:
http://www.learncpp.com/cpp-tutorial/85-constructors/[^]

这篇关于构造函数不匹配的参数和参数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IT屋！