31 lines
660 B
C++
31 lines
660 B
C++
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#include <boost/bind.hpp>
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#include <boost/ref.hpp>
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#include <boost/parameter.hpp>
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#include <string>
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#include <functional>
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namespace parameter = boost::parameter;
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BOOST_PARAMETER_NAME(s1)
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BOOST_PARAMETER_NAME(s2)
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BOOST_PARAMETER_NAME(s3)
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template <class ArgumentPack>
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std::string f(ArgumentPack const& args)
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{
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std::string const& s1 = args[_s1];
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std::string const& s2 = args[_s2];
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typename parameter::binding<
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ArgumentPack, tag::s3, std::string
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>::type s3 = args[_s3
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|| boost::bind(std::plus<std::string>(), boost::ref(s1), boost::ref(s2)) ];
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return s3;
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}
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std::string x = f((_s1="hello,", _s2=" world", _s3="hi world"));
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int main()
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{}
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