C + + operator knowledge points

Go C + + implicit type conversion operator T

http://m.blog.csdn.net/blog/micx0124/12389973#

For the operator keyword for operator overloading we all know that operator has another role: coercion type conversion. Last week in order to correspond to a problem in the project, the colleague helped write a class, the use of operator forced type conversion, then source review when a few leader also do not understand its role, asked me how it happened, then I was just smattering, Helpless analysis of half a day also did not let leader understand, Khan ... It was then clear to the colleagues to parse it.
The following is an example to illustrate:

/*************************test_operatorconvert.h*************************/#ifndef Test_operatorconvert_h#define test_operatorconvert_hconst int max_path2 = 256;class test_operatorconvert{public:    test_operatorconvert ();    Test_operatorconvert (char *str);    Virtual ~test_operatorconvert ();    Char *getstr ();    Operator char* ();p rivate:    char m_sztest[max_path2];}; #endif

/*************************test_operatorconvert.cpp*************************/#include "stdafx.h" #include "Test_ OperatorConvert.h "#include <iostream>using namespace std; Test_operatorconvert::test_operatorconvert () {    memset (m_sztest, 0, sizeof (m_sztest));} Test_operatorconvert::test_operatorconvert (char *str) {    strcpy (m_sztest, str);} The function of Test_operatorconvert::~test_operatorconvert () {}//) is consistent with the function of operator char* (). Char *test_operatorconvert::getstr () {    return m_sztest;} Test_operatorconvert::operator char* () {    return m_sztest;}

int main (int argc, char* argv[]) {    Test_operatorconvert ctestinstance;    char *ptest1 = ctestinstance; This is where operator char* () works,                                                      //class Test_operatorconvert are converted to char* type.    char *ptest2 = CTESTINSTANCE.GETSTR ();//If Operator char* () is not implemented, the same method is used.    return 0;}

Some people call this method: implicit type conversion, the basic method of implementation is: operator type_name ();

C + + operator knowledge points