30 lines
859 B
C++
30 lines
859 B
C++
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/*=============================================================================
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Copyright (c) 2017 Paul Fultz II
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implicit.cpp
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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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==============================================================================*/
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#include <boost/hof/implicit.hpp>
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template<class T>
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struct auto_caster
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{
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template<class U>
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T operator()(U x)
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{
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return T(x);
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}
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};
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int main()
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{
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boost::hof::implicit<auto_caster> auto_cast = {};
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auto x = auto_cast(1.5);
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(void)x;
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// This is not possible in c++17 due to guaranteed copy elison
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#if BOOST_HOF_HAS_STD_17 || (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7)
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static_assert(false, "Always fail");
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#endif
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}
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