| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2017 Paul Fultz II |
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| 3 | implicit.cpp |
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| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | ==============================================================================*/ |
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| 7 | #include <boost/hof/implicit.hpp> |
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| 8 | |
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| 9 | template<class T> |
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| 10 | struct auto_caster |
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| 11 | { |
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| 12 | template<class U> |
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| 13 | T operator()(U x) |
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| 14 | { |
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| 15 | return T(x); |
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| 16 | } |
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| 17 | }; |
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| 18 | |
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| 19 | |
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| 20 | int main() |
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| 21 | { |
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| 22 | boost::hof::implicit<auto_caster> auto_cast = {}; |
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| 23 | auto x = auto_cast(1.5); |
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| 24 | (void)x; |
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| 25 | // This is not possible in c++17 due to guaranteed copy elison |
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| 26 | #if BOOST_HOF_HAS_STD_17 || (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7) |
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| 27 | static_assert(false, "Always fail" ); |
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| 28 | #endif |
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| 29 | } |
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| 30 | |
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