用c++写一个单例模式的例子

用c++写一个单例模式的例子

#pragma once

class cPrintError
{
public:
cPrintError(void);
~cPrintError(void);

private:
static cPrintError *mp_PrintError;
public:
static cPrintError *CreateInstance();

public:
void ShowMsgBox_Digit(int i_digit);
void ShowMsgBox_Str(wchar_t *sz_str);
};

#define CPRINTERROR cPrintError::CreateInstance()

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#include "StdAfx.h"
#include "cPrintError.h"

#include

cPrintError *cPrintError::mp_PrintError=NULL;

cPrintError::cPrintError(void)
{
}

cPrintError::~cPrintError(void)
{
if(mp_PrintError)
{
delete mp_PrintError;
mp_PrintError=0;
}
}

cPrintError *cPrintError::CreateInstance()
{
if(mp_PrintError==NULL)
{
mp_PrintError=new cPrintError();
if(!mp_PrintError)
{
assert(mp_PrintError);
return 0;
}
}

return mp_PrintError;
}

void cPrintError::ShowMsgBox_Digit( int i_digit )
{
if(!i_digit)
return;

wchar_t sz_buffer[32]={0,};
wsprintf(sz_buffer,TEXT("%d"),i_digit);
if(sz_buffer&&sizeof(sz_buffer)>0)
{
MessageBox(NULL,sz_buffer,TEXT("ERROR"),MB_OK|MB_ICONERROR);
}
else
{
assert(sz_buffer&&sizeof(sz_buffer));
return;
}
}

void cPrintError::ShowMsgBox_Str( wchar_t *sz_str )
{
if(!sz_str)
return;

wchar_t sz_buffer[64]={0,};
wsprintf(sz_buffer,TEXT("%s"),sz_str);
if(sz_buffer&&sizeof(sz_buffer)>0)
{
MessageBox(NULL,sz_buffer,TEXT("ERROR"),MB_OK|MB_ICONERROR);
}
else
{
assert(sz_buffer&&sizeof(sz_buffer));
return;
}
}