To initialize a static object across C + + files and libraries

Vacations are usually a good time to look back on the past. Here is a question that I was thinking about last month that made me "Ah-hah" for a moment.

Problem:

When you compile the following C + + program, you may think that the objects in the Modules (module) will be compiled and initialized first.

This assumption may not have the desired result.

X.h:

#include <string>

using namespace Std; The Translator notes: Add this line

Class Cobjet {

Public

static const string STRINGX;

};

X.cpp:

#include <X.h>

using namespace Std; Translator Note: This line can not

Const string COBJET::STRINGX = "001";

Y.cpp:

#include <iostream>

#include <X.h>

const string stringy= cobjet::stringx;

int main () {

cout << "Cobjet::stringx [" <<cobjet::stringx << "]" << Endl;

cout << "stringy [<< stringy <<"] "<< Endl;

return 0;

}

If you compile with the following command:

Xlc-c-i./X.cpp-o X.O

Xlc-c-i./Y.cpp-o y.o

Xlc-o binary X.O y.o