Gotchas in the C++ programing language

Initializer lists

In C++, it is the order of the class inheritance and of the member variables that determine the initialization order, not the order of an initializer list:

#include <iostream>

class CSomeClass
{
public:
CSomeClass(int n)
{
std::cout << "CSomeClass constructor with value ";
std::cout << n << std::endl;
}
};

class CSomeOtherClass
{
public:
CSomeOtherClass() //In this example, despite the list order,
: obj2(2), obj1(1) //obj1 will be initialized before obj2.
{
//Do nothing.
}
private:
CSomeClass obj1;
CSomeClass obj2;
};

int main(void)
{
CSomeOtherClass obj;
return 0;
}