C / C++ / MFC

class CFoo
{
  operator bool() /* const */ { return IAmTrue; }
};

class CFoo
{
public:
  operator bool()
  {
    return whateveryoulike;
  }
};

CFile tmpFile;
CString fileName = "C:\\sometext.txt";
CString strStorage;

if(tmpFile.Open(fileName,CFile::modeRead))
{
	// Declare a large buffer for reading the text
	char cBuf[1024];
	UINT uBytesRead;

	// Continue reading until no more data is read
	while(uBytesRead = tmpFile.Read(cBuf, sizeof(cBuf)-1))
	{
		// Null terminate after the last charcter
		cBuf[uBytesRead] = NULL;

		// add the buffer to the mapped CString
		strStorage += CString(cBuf);
	}

	//Close the file
	tmpFile.Close();
}

UINT uRead;
CString cs;
const UINT tmpRed = sizeof(tmpBuf)/sizeof(TCHAR) - sizeof(TCHAR);
do {
    uRead = c.Read(tmpBuf,tmpSize);
    if( uRead > 0 )
    {
        // ass-u-me multi-byte text only read
        tmpBuf[uRead] = _T('\0');
        cs += tmpBuf;
    }
} while( uRead );