Boolean in ifdef: is “#ifdef A && B” the same as “#if defined(A) && defined(B)”?

Question

In C++, is this:

#ifdef A && B

the same as:

#if defined(A) && defined(B)

?

I was

Answer 1

For those that might be looking for example (UNIX/g++) that is a little different from the OP, this may help:

`

#if(defined A && defined B && defined C)
    const string foo = "xyz";
#else
#if(defined A && defined B)
    const string foo = "xy";
#else
#if(defined A && defined C)
    const string foo = "xz";
#else
#ifdef A
    const string foo = "x";
#endif
#endif
#endif
#endif