August 2017
Intermediate to advanced
438 pages
14h 19m
English
Content preview from Boost C++ Application Development Cookbook - Second Edition
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The main problem with writing the higher-order metafunctions is taking care of the placeholders. That's why we shall not call Func1<Param1>::type directly. Instead of that, we must use the boost::mpl::apply metafunction, which accepts one function and up to five parameters that shall be passed to this function.
You may configure boost::mpl::apply to accept even more parameters, defining the BOOST_MPL_LIMIT_METAFUNCTION_ARITY macro to the required amount of parameters, for example, to 6.
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