boost::urls::grammar::see_below::is_charset<T, void_t<decltype(pass:[std::declval<bool&>()
Synopsis
Declared in <boost/url/grammar/charset.hpp>
template<class T>
struct is_charset<T, void_t<decltype(std::declval() =
std::declval().operator()(
std::declval()))>>
: std::true_type;
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