132 lines
3.7 KiB
C++
132 lines
3.7 KiB
C++
#ifndef BOOST_LEAF_DETAIL_PRINT_HPP_INCLUDED
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#define BOOST_LEAF_DETAIL_PRINT_HPP_INCLUDED
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// Copyright 2018-2022 Emil Dotchevski and Reverge Studios, Inc.
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/leaf/config.hpp>
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#include <boost/leaf/detail/demangle.hpp>
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#if BOOST_LEAF_CFG_DIAGNOSTICS
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#include <type_traits>
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#include <exception>
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#include <iosfwd>
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#include <cstring>
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namespace boost { namespace leaf {
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namespace leaf_detail
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{
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template <class T, class E = void>
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struct is_printable: std::false_type
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{
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};
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template <class T>
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struct is_printable<T, decltype(std::declval<std::ostream&>()<<std::declval<T const &>(), void())>: std::true_type
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{
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};
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////////////////////////////////////////
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template <class T, class E = void>
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struct has_printable_member_value: std::false_type
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{
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};
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template <class T>
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struct has_printable_member_value<T, decltype(std::declval<std::ostream&>()<<std::declval<T const &>().value, void())>: std::true_type
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{
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};
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////////////////////////////////////////
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template <
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class Wrapper,
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bool WrapperPrintable = is_printable<Wrapper>::value,
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bool ValuePrintable = has_printable_member_value<Wrapper>::value,
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bool IsException = std::is_base_of<std::exception,Wrapper>::value,
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bool IsEnum = std::is_enum<Wrapper>::value>
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struct diagnostic;
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template <class Wrapper, bool ValuePrintable, bool IsException, bool IsEnum>
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struct diagnostic<Wrapper, true, ValuePrintable, IsException, IsEnum>
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{
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static constexpr bool is_invisible = false;
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template <class CharT, class Traits>
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static void print( std::basic_ostream<CharT, Traits> & os, Wrapper const & x )
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{
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os << x;
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}
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};
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template <class Wrapper, bool IsException, bool IsEnum>
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struct diagnostic<Wrapper, false, true, IsException, IsEnum>
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{
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static constexpr bool is_invisible = false;
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template <class CharT, class Traits>
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static void print( std::basic_ostream<CharT, Traits> & os, Wrapper const & x )
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{
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os << type<Wrapper>() << ": " << x.value;
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}
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};
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template <class Wrapper, bool IsEnum>
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struct diagnostic<Wrapper, false, false, true, IsEnum>
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{
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static constexpr bool is_invisible = false;
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template <class CharT, class Traits>
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static void print( std::basic_ostream<CharT, Traits> & os, Wrapper const & ex )
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{
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os << type<Wrapper>() << ": std::exception::what(): " << ex.what();
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}
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};
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template <class Wrapper>
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struct diagnostic<Wrapper, false, false, false, false>
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{
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static constexpr bool is_invisible = false;
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template <class CharT, class Traits>
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static void print( std::basic_ostream<CharT, Traits> & os, Wrapper const & )
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{
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os << type<Wrapper>() << ": {Non-Printable}";
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}
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};
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template <class Wrapper>
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struct diagnostic<Wrapper, false, false, false, true>
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{
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static constexpr bool is_invisible = false;
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template <class CharT, class Traits>
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static void print( std::basic_ostream<CharT, Traits> & os, Wrapper const & w )
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{
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os << type<Wrapper>() << ": " << static_cast<typename std::underlying_type<Wrapper>::type>(w);
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}
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};
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template <>
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struct diagnostic<std::exception_ptr, false, false, false>
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{
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static constexpr bool is_invisible = true;
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template <class CharT, class Traits>
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BOOST_LEAF_CONSTEXPR static void print( std::basic_ostream<CharT, Traits> &, std::exception_ptr const & )
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{
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}
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};
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}
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} }
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#endif
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#endif
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