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boost::contract::condition_if — Select compilation and execution of a boolean functor template condition using a nullary boolean meta-function (not needed on C++17 compilers, use if constexpr instead). 
// In header: <boost/contract/call_if.hpp> template<typename Pred, typename Then> bool condition_if(Then f, bool else_ = true);
This is equivalent to boost::contract::condition_if_c<Pred::value>(f, else_). Compile and execute the nullary boolean functor template call f() if and only if the specified nullary boolean meta-function Pred::value is true, otherwise trivially return else_ (true by default) at run-time.
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| Returns: | Boolean value returned by  |