[C++] Constructor call other constructor

#include    

class Foo
{
public:
    Foo() { Foo(1); };
    Foo(int a) { m = a; std::cout <<"Foo " << a << std::endl; }

private:
    int m;
};                    

int main()
{
    Foo a, b(2);
    return 0;
}

It is ok to call other constructor on method body, but calling other constructor on Initialize list is not allowed!
The following example is not allowed.

#include    

class Foo
{
public:
    // this will cause compile error!!
    Foo() : this(1) { };
    Foo(int a) { m = a; std::cout <<"Foo " << a << std::endl; }

private:
    int m;
};                    

int main()
{
    Foo a, b(2);
    return 0;
}

Reference:
http://stackoverflow.com/questions/308276/c-call-constructor-from-constructor