Re: [boost] [utility] Proposal to extract some components from Boost.Log

On Sunday 01 September 2013 07:46:40 John Bytheway wrote:

But this works:

struct foo { void* m_p;

constexpr explicit operator bool () const { return !this->operator!(); }

constexpr bool operator! () const { return !m_p; } };

int main() { constexpr auto f = foo{nullptr}; constexpr auto b = bool(f); return b; }

That would force the user to have constexpr operator!, which is not always possible. I think two macros are a better choice.