mirror of https://gitee.com/bigwinds/arangodb
74 lines
1.4 KiB
C++
Executable File
74 lines
1.4 KiB
C++
Executable File
// Copyright Daniel Wallin 2006. Use, modification and distribution is
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// subject to 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/parameter/preprocessor.hpp>
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#include <boost/parameter/name.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/tuple/tuple.hpp>
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#include <string>
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#include "basics.hpp"
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#include <boost/utility/enable_if.hpp>
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namespace test {
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namespace mpl = boost::mpl;
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using mpl::_;
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using boost::is_convertible;
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BOOST_PARAMETER_NAME(x)
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// Sun has problems with this syntax:
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//
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// template1< r* ( template2<x> ) >
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//
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// Workaround: factor template2<x> into a separate typedef
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#if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x580))
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typedef is_convertible<_,char const*> predicate;
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BOOST_PARAMETER_FUNCTION((int), sfinae, tag,
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(deduced
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(optional (x, *(predicate), 0))
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)
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)
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{
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return 1;
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}
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#else
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BOOST_PARAMETER_FUNCTION((int), sfinae, tag,
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(deduced
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(optional (x, *(is_convertible<_,char const*>), 0))
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)
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)
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{
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return 1;
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}
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#endif
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template<class A0>
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typename boost::enable_if<boost::is_same<int,A0>, int>::type
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sfinae(A0 const& a0)
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{
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return 0;
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}
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} // namespace test
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int main()
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{
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using namespace test;
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assert(sfinae() == 1);
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assert(sfinae("foo") == 1);
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assert(sfinae(1) == 0);
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return 0;
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}
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