Question

25% of programmers work time is spended by checking if the required code already exist.

I’m searching for a base class for implementing the safe bool idiom.

Answer 1

bool_testable<> in Boost.Operators looks promising.

The reference mentions that:

bool_testable provides the antithesis of
operator bool, such that the expression if (!p) is valid, whilst also
making operator bool safer by preventing accidental conversions to
integer types. … bool_testable<> prevents these accidental
conversions by declaring a private conversion operator to signed char,
and not defining the body.