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57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
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// Copyright (c) 2018-2022 Dr. Colin Hirsch and Daniel Frey
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// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
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#ifndef TAO_PEGTL_CONTRIB_IF_THEN_HPP
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#define TAO_PEGTL_CONTRIB_IF_THEN_HPP
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#include <type_traits>
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#include "../config.hpp"
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#include "../internal/enable_control.hpp"
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#include "../internal/failure.hpp"
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#include "../internal/if_then_else.hpp"
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#include "../internal/seq.hpp"
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#include "../internal/success.hpp"
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namespace TAO_PEGTL_NAMESPACE
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{
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namespace internal
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{
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template< typename Cond, typename Then >
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struct if_pair
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{};
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template< typename... Pairs >
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struct if_then;
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template< typename Cond, typename Then, typename... Pairs >
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struct if_then< if_pair< Cond, Then >, Pairs... >
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: if_then_else< Cond, Then, if_then< Pairs... > >
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{
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template< typename ElseCond, typename... Thens >
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using else_if_then = if_then< if_pair< Cond, Then >, Pairs..., if_pair< ElseCond, seq< Thens... > > >;
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template< typename... Thens >
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using else_then = if_then_else< Cond, Then, if_then< Pairs..., if_pair< success, seq< Thens... > > > >;
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};
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template<>
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struct if_then<>
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: failure
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{};
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template< typename... Pairs >
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inline constexpr bool enable_control< if_then< Pairs... > > = false;
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} // namespace internal
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template< typename Cond, typename... Thens >
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struct if_then
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: internal::if_then< internal::if_pair< Cond, internal::seq< Thens... > > >
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{};
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} // namespace TAO_PEGTL_NAMESPACE
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#endif
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