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51 lines
2.4 KiB
C++
51 lines
2.4 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2014-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_RANGE_FOR_HPP
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#define RANGES_V3_RANGE_FOR_HPP
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/range/access.hpp>
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#if RANGES_CXX_RANGE_BASED_FOR < RANGES_CXX_RANGE_BASED_FOR_17
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/// A range-based for macro, basically a hack until the built-in range-for can handle
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/// Ranges that have a different type for begin and end. \ingroup range-core
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#define RANGES_FOR(VAR_DECL, ...) \
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if(bool CPP_PP_CAT(_range_v3_done, __LINE__) = false) {} \
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else \
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for(auto && CPP_PP_CAT(_range_v3_rng, __LINE__) = (__VA_ARGS__); \
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!CPP_PP_CAT(_range_v3_done, __LINE__);) \
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for(auto CPP_PP_CAT(_range_v3_begin, __LINE__) = \
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ranges::begin(CPP_PP_CAT(_range_v3_rng, __LINE__)); \
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!CPP_PP_CAT(_range_v3_done, __LINE__); \
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CPP_PP_CAT(_range_v3_done, __LINE__) = true) \
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for(auto CPP_PP_CAT(_range_v3_end, __LINE__) = \
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ranges::end(CPP_PP_CAT(_range_v3_rng, __LINE__)); \
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!CPP_PP_CAT(_range_v3_done, __LINE__) && \
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CPP_PP_CAT(_range_v3_begin, __LINE__) != \
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CPP_PP_CAT(_range_v3_end, __LINE__); \
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++CPP_PP_CAT(_range_v3_begin, __LINE__)) \
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if(!(CPP_PP_CAT(_range_v3_done, __LINE__) = true)) {} \
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else \
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for(VAR_DECL = *CPP_PP_CAT(_range_v3_begin, __LINE__); \
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CPP_PP_CAT(_range_v3_done, __LINE__); \
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CPP_PP_CAT(_range_v3_done, __LINE__) = false) \
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/**/
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#else
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#define RANGES_FOR(VAR_DECL, ...) for(VAR_DECL : (__VA_ARGS__))
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#endif
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#endif
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