Is there a safe bool idiom helper in boost? [closed]

问题

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Closed 8 years ago.

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.

回答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.

回答2:

The safest thing to do is to not have implicit conversion to bool.

Make that conversion explicit.

Then the name, if chosen well, can also help people understand what it's all about.

Cheers & hth.,

来源：https://stackoverflow.com/questions/6883901/is-there-a-safe-bool-idiom-helper-in-boost