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Add operator<<, operator>>

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This commit is contained in:
Peter Dimov 2021-06-27 05:15:47 +03:00
parent c4dfb9786b
commit a3cb2d75f4
2 changed files with 50 additions and 0 deletions
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43
include/boost/lambda2/lambda2.hpp
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@ -18,6 +18,8 @@ namespace boost
namespace lambda2
{
// placeholders
template<int I> struct lambda2_arg
{
};
@ -55,6 +57,40 @@ namespace lambda2
namespace lambda2_detail
{
// additional function objects
#define BOOST_LAMBDA2_PREFIX_FN(op, fn) \
struct fn \
{ \
template<class T> decltype(auto) operator()(T&& t) const \
{ \
return op std::forward<T>(t); \
} \
};
#define BOOST_LAMBDA2_POSTFIX_FN(op, fn) \
struct fn \
{ \
template<class T> decltype(auto) operator()(T&& t) const \
{ \
return std::forward<T>(t) op; \
} \
};
#define BOOST_LAMBDA2_BINARY_FN(op, fn) \
struct fn \
{ \
template<class T1, class T2> decltype(auto) operator()(T1&& t1, T2&& t2) const \
{ \
return std::forward<T1>(t1) op std::forward<T2>(t2); \
} \
};
BOOST_LAMBDA2_BINARY_FN(<<, left_shift)
BOOST_LAMBDA2_BINARY_FN(>>, right_shift)
// operators
template<class T> using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
template<class T, class T2 = remove_cvref_t<T>> using is_lambda_expression =
@ -82,6 +118,8 @@ template<class A, class B> using enable_binary_lambda =
return std::bind( fn(), std::forward<A>(a), std::forward<B>(b) ); \
}
// standard
BOOST_LAMBDA2_BINARY_LAMBDA(+, std::plus<>)
BOOST_LAMBDA2_BINARY_LAMBDA(-, std::minus<>)
BOOST_LAMBDA2_BINARY_LAMBDA(*, std::multiplies<>)
@ -105,6 +143,11 @@ BOOST_LAMBDA2_BINARY_LAMBDA(|, std::bit_or<>)
BOOST_LAMBDA2_BINARY_LAMBDA(^, std::bit_xor<>)
BOOST_LAMBDA2_UNARY_LAMBDA(~, std::bit_not<>)
// additional
BOOST_LAMBDA2_BINARY_LAMBDA(<<, lambda2_detail::left_shift)
BOOST_LAMBDA2_BINARY_LAMBDA(>>, lambda2_detail::right_shift)
} // namespace lambda2
} // namespace boost

7
test/lambda2_test.cpp
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@ -2,6 +2,10 @@
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#if defined(_MSC_VER) && _MSC_VER == 1900
# pragma warning(disable: 4552) // '<<': operator has no effect; expected operator with side-effect
#endif
#include <boost/lambda2.hpp>
#include <boost/core/lightweight_test.hpp>
@ -56,5 +60,8 @@ int main()
#endif
TEST_BINARY(<<)
TEST_BINARY(>>)
return boost::report_errors();
}