--- /dev/null
+#ifndef BOOST_LAMBDA2_LAMBDA2_HPP_INCLUDED
+#define BOOST_LAMBDA2_LAMBDA2_HPP_INCLUDED
+
+// Copyright 2020, 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <functional>
+#include <type_traits>
+#include <utility>
+#include <tuple>
+#include <cstddef>
+#include <iosfwd>
+
+// Same format as BOOST_VERSION:
+// major * 100000 + minor * 100 + patch
+#define BOOST_LAMBDA2_VERSION 107900
+
+namespace boost
+{
+namespace lambda2
+{
+
+namespace lambda2_detail
+{
+
+struct subscript
+{
+ template<class T1, class T2> decltype(auto) operator()(T1&& t1, T2&& t2) const
+ {
+ return std::forward<T1>(t1)[ std::forward<T2>(t2) ];
+ }
+};
+
+template<int I> struct get
+{
+ template<class T> decltype(auto) operator()( T&& t ) const
+ {
+ return std::get<I>( std::forward<T>(t) );
+ }
+};
+
+} // namespace lambda2_detail
+
+// placeholders
+
+template<int I> struct lambda2_arg
+{
+ template<class... A> decltype(auto) operator()( A&&... a ) const noexcept
+ {
+ return std::get<std::size_t{I-1}>( std::tuple<A&&...>( std::forward<A>(a)... ) );
+ }
+
+ template<class T> auto operator[]( T&& t ) const
+ {
+ return std::bind( lambda2_detail::subscript(), *this, std::forward<T>( t ) );
+ }
+};
+
+#if defined(__cpp_inline_variables) && __cpp_inline_variables >= 201606L
+# define BOOST_LAMBDA2_INLINE_VAR inline
+#else
+# define BOOST_LAMBDA2_INLINE_VAR
+#endif
+
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<1> _1{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<2> _2{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<3> _3{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<4> _4{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<5> _5{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<6> _6{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<7> _7{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<8> _8{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_arg<9> _9{};
+
+// first, second
+
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_detail::get<0> first{};
+BOOST_LAMBDA2_INLINE_VAR constexpr lambda2_detail::get<1> second{};
+
+#undef BOOST_LAMBDA2_INLINE_VAR
+
+} // namespace lambda2
+} // namespace boost
+
+namespace std
+{
+
+template<int I> struct is_placeholder< boost::lambda2::lambda2_arg<I> >: integral_constant<int, I>
+{
+};
+
+} // namespace std
+
+namespace boost
+{
+namespace lambda2
+{
+
+namespace lambda2_detail
+{
+
+// additional function objects
+
+#define BOOST_LAMBDA2_UNARY_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)
+
+BOOST_LAMBDA2_UNARY_FN(+, unary_plus)
+BOOST_LAMBDA2_UNARY_FN(*, dereference)
+
+BOOST_LAMBDA2_UNARY_FN(++, increment)
+BOOST_LAMBDA2_UNARY_FN(--, decrement)
+
+BOOST_LAMBDA2_POSTFIX_FN(++, postfix_increment)
+BOOST_LAMBDA2_POSTFIX_FN(--, postfix_decrement)
+
+BOOST_LAMBDA2_BINARY_FN(+=, plus_equal)
+BOOST_LAMBDA2_BINARY_FN(-=, minus_equal)
+BOOST_LAMBDA2_BINARY_FN(*=, multiplies_equal)
+BOOST_LAMBDA2_BINARY_FN(/=, divides_equal)
+BOOST_LAMBDA2_BINARY_FN(%=, modulus_equal)
+BOOST_LAMBDA2_BINARY_FN(&=, bit_and_equal)
+BOOST_LAMBDA2_BINARY_FN(|=, bit_or_equal)
+BOOST_LAMBDA2_BINARY_FN(^=, bit_xor_equal)
+BOOST_LAMBDA2_BINARY_FN(<<=, left_shift_equal)
+BOOST_LAMBDA2_BINARY_FN(>>=, right_shift_equal)
+
+// 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 =
+ std::integral_constant<bool, std::is_placeholder<T2>::value || std::is_bind_expression<T2>::value>;
+
+template<class A> using enable_unary_lambda =
+ std::enable_if_t<is_lambda_expression<A>::value>;
+
+template<class A, class B> using enable_binary_lambda =
+ std::enable_if_t<is_lambda_expression<A>::value || is_lambda_expression<B>::value>;
+
+template<class T> using is_stream = std::is_base_of<std::ios_base, remove_cvref_t<T>>;
+
+} // namespace lambda2_detail
+
+#define BOOST_LAMBDA2_UNARY_LAMBDA(op, fn) \
+ template<class A, class = lambda2_detail::enable_unary_lambda<A>> \
+ auto operator op( A&& a ) \
+ { \
+ return std::bind( fn(), std::forward<A>(a) ); \
+ }
+
+#define BOOST_LAMBDA2_POSTFIX_LAMBDA(op, fn) \
+ template<class A, class = lambda2_detail::enable_unary_lambda<A>> \
+ auto operator op( A&& a, int ) \
+ { \
+ return std::bind( fn(), std::forward<A>(a) ); \
+ }
+
+#define BOOST_LAMBDA2_BINARY_LAMBDA(op, fn) \
+ template<class A, class B, class = lambda2_detail::enable_binary_lambda<A, B>> \
+ auto operator op( A&& a, B&& b ) \
+ { \
+ 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<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(/, std::divides<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(%, std::modulus<>)
+BOOST_LAMBDA2_UNARY_LAMBDA(-, std::negate<>)
+
+BOOST_LAMBDA2_BINARY_LAMBDA(==, std::equal_to<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(!=, std::not_equal_to<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(>, std::greater<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(<, std::less<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(>=, std::greater_equal<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(<=, std::less_equal<>)
+
+BOOST_LAMBDA2_BINARY_LAMBDA(&&, std::logical_and<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(||, std::logical_or<>)
+BOOST_LAMBDA2_UNARY_LAMBDA(!, std::logical_not<>)
+
+BOOST_LAMBDA2_BINARY_LAMBDA(&, std::bit_and<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(|, std::bit_or<>)
+BOOST_LAMBDA2_BINARY_LAMBDA(^, std::bit_xor<>)
+BOOST_LAMBDA2_UNARY_LAMBDA(~, std::bit_not<>)
+
+// additional
+
+BOOST_LAMBDA2_UNARY_LAMBDA(+, lambda2_detail::unary_plus)
+BOOST_LAMBDA2_UNARY_LAMBDA(*, lambda2_detail::dereference)
+
+BOOST_LAMBDA2_UNARY_LAMBDA(++, lambda2_detail::increment)
+BOOST_LAMBDA2_UNARY_LAMBDA(--, lambda2_detail::decrement)
+
+BOOST_LAMBDA2_POSTFIX_LAMBDA(++, lambda2_detail::postfix_increment)
+BOOST_LAMBDA2_POSTFIX_LAMBDA(--, lambda2_detail::postfix_decrement)
+
+// compound assignment
+
+BOOST_LAMBDA2_BINARY_LAMBDA(+=, lambda2_detail::plus_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(-=, lambda2_detail::minus_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(*=, lambda2_detail::multiplies_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(/=, lambda2_detail::divides_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(%=, lambda2_detail::modulus_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(&=, lambda2_detail::bit_and_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(|=, lambda2_detail::bit_or_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(^=, lambda2_detail::bit_xor_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(<<=, lambda2_detail::left_shift_equal)
+BOOST_LAMBDA2_BINARY_LAMBDA(>>=, lambda2_detail::right_shift_equal)
+
+// operator<<
+
+template<class A, class = std::enable_if_t<!lambda2_detail::is_stream<A>::value>,
+ class B, class = lambda2_detail::enable_binary_lambda<A, B>>
+auto operator<<( A&& a, B&& b )
+{
+ return std::bind( lambda2_detail::left_shift(), std::forward<A>(a), std::forward<B>(b) );
+}
+
+template<class A, class = std::enable_if_t<lambda2_detail::is_stream<A>::value>,
+ class B, class = lambda2_detail::enable_unary_lambda<B>>
+auto operator<<( A& a, B&& b )
+{
+ return std::bind( lambda2_detail::left_shift(), std::ref(a), std::forward<B>(b) );
+}
+
+// operator>>
+
+template<class A, class = std::enable_if_t<!lambda2_detail::is_stream<A>::value>,
+ class B, class = lambda2_detail::enable_binary_lambda<A, B>>
+auto operator>>( A&& a, B&& b )
+{
+ return std::bind( lambda2_detail::right_shift(), std::forward<A>(a), std::forward<B>(b) );
+}
+
+template<class A, class = std::enable_if_t<lambda2_detail::is_stream<A>::value>,
+ class B, class = lambda2_detail::enable_unary_lambda<B>>
+auto operator>>( A& a, B&& b )
+{
+ return std::bind( lambda2_detail::right_shift(), std::ref(a), std::forward<B>(b) );
+}
+
+// operator->*
+
+template<class A, class B, class = lambda2_detail::enable_unary_lambda<A>>
+auto operator->*( A&& a, B&& b )
+{
+ return std::bind( std::forward<B>(b), std::forward<A>(a) );
+}
+
+} // namespace lambda2
+} // namespace boost
+
+#endif // #ifndef BOOST_LAMBDA2_LAMBDA2_HPP_INCLUDED
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