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370 lines
17 KiB
370 lines
17 KiB
// Boost Lambda Library - operators.hpp -------------------------------------- |
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// Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi) |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// For more information, see www.boost.org |
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// --------------------------------------------------------------- |
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#ifndef BOOST_LAMBDA_OPERATORS_HPP |
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#define BOOST_LAMBDA_OPERATORS_HPP |
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#include "boost/lambda/detail/is_instance_of.hpp" |
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namespace boost { |
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namespace lambda { |
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#if defined BOOST_LAMBDA_BE1 |
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#error "Multiple defines of BOOST_LAMBDA_BE1" |
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#endif |
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// For all BOOSTA_LAMBDA_BE* macros: |
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// CONSTA must be either 'A' or 'const A' |
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// CONSTB must be either 'B' or 'const B' |
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// It is stupid to have the names A and B as macro arguments, but it avoids |
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// the need to pass in emtpy macro arguments, which gives warnings on some |
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// compilers |
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#define BOOST_LAMBDA_BE1(OPER_NAME, ACTION, CONSTA, CONSTB, CONVERSION) \ |
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template<class Arg, class B> \ |
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inline const \ |
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lambda_functor< \ |
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lambda_functor_base< \ |
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ACTION, \ |
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tuple<lambda_functor<Arg>, typename const_copy_argument <CONSTB>::type> \ |
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> \ |
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> \ |
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OPER_NAME (const lambda_functor<Arg>& a, CONSTB& b) { \ |
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return \ |
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lambda_functor_base< \ |
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ACTION, \ |
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tuple<lambda_functor<Arg>, typename const_copy_argument <CONSTB>::type>\ |
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> \ |
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(tuple<lambda_functor<Arg>, typename const_copy_argument <CONSTB>::type>(a, b)); \ |
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} |
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#if defined BOOST_LAMBDA_BE2 |
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#error "Multiple defines of BOOST_LAMBDA_BE2" |
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#endif |
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#define BOOST_LAMBDA_BE2(OPER_NAME, ACTION, CONSTA, CONSTB, CONVERSION) \ |
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template<class A, class Arg> \ |
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inline const \ |
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lambda_functor< \ |
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lambda_functor_base< \ |
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ACTION, \ |
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tuple<typename CONVERSION <CONSTA>::type, lambda_functor<Arg> > \ |
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> \ |
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> \ |
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OPER_NAME (CONSTA& a, const lambda_functor<Arg>& b) { \ |
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return \ |
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lambda_functor_base< \ |
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ACTION, \ |
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tuple<typename CONVERSION <CONSTA>::type, lambda_functor<Arg> > \ |
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> \ |
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(tuple<typename CONVERSION <CONSTA>::type, lambda_functor<Arg> >(a, b)); \ |
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} |
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#if defined BOOST_LAMBDA_BE3 |
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#error "Multiple defines of BOOST_LAMBDA_BE3" |
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#endif |
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#define BOOST_LAMBDA_BE3(OPER_NAME, ACTION, CONSTA, CONSTB, CONVERSION) \ |
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template<class ArgA, class ArgB> \ |
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inline const \ |
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lambda_functor< \ |
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lambda_functor_base< \ |
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ACTION, \ |
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tuple<lambda_functor<ArgA>, lambda_functor<ArgB> > \ |
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> \ |
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> \ |
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OPER_NAME (const lambda_functor<ArgA>& a, const lambda_functor<ArgB>& b) { \ |
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return \ |
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lambda_functor_base< \ |
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ACTION, \ |
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tuple<lambda_functor<ArgA>, lambda_functor<ArgB> > \ |
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> \ |
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(tuple<lambda_functor<ArgA>, lambda_functor<ArgB> >(a, b)); \ |
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} |
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#if defined BOOST_LAMBDA_BE |
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#error "Multiple defines of BOOST_LAMBDA_BE" |
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#endif |
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#define BOOST_LAMBDA_BE(OPER_NAME, ACTION, CONSTA, CONSTB, CONST_CONVERSION) \ |
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BOOST_LAMBDA_BE1(OPER_NAME, ACTION, CONSTA, CONSTB, CONST_CONVERSION) \ |
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BOOST_LAMBDA_BE2(OPER_NAME, ACTION, CONSTA, CONSTB, CONST_CONVERSION) \ |
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BOOST_LAMBDA_BE3(OPER_NAME, ACTION, CONSTA, CONSTB, CONST_CONVERSION) |
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#define BOOST_LAMBDA_EMPTY() |
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BOOST_LAMBDA_BE(operator+, arithmetic_action<plus_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator-, arithmetic_action<minus_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator*, arithmetic_action<multiply_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator/, arithmetic_action<divide_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator%, arithmetic_action<remainder_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator<<, bitwise_action<leftshift_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator>>, bitwise_action<rightshift_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator&, bitwise_action<and_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator|, bitwise_action<or_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator^, bitwise_action<xor_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator&&, logical_action<and_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator||, logical_action<or_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator<, relational_action<less_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator>, relational_action<greater_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator<=, relational_action<lessorequal_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator>=, relational_action<greaterorequal_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator==, relational_action<equal_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator!=, relational_action<notequal_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE(operator+=, arithmetic_assignment_action<plus_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator-=, arithmetic_assignment_action<minus_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator*=, arithmetic_assignment_action<multiply_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator/=, arithmetic_assignment_action<divide_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator%=, arithmetic_assignment_action<remainder_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator<<=, bitwise_assignment_action<leftshift_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator>>=, bitwise_assignment_action<rightshift_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator&=, bitwise_assignment_action<and_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator|=, bitwise_assignment_action<or_action>, A, const B, reference_argument) |
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BOOST_LAMBDA_BE(operator^=, bitwise_assignment_action<xor_action>, A, const B, reference_argument) |
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// A special trick for comma operator for correct preprocessing |
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#if defined BOOST_LAMBDA_COMMA_OPERATOR_NAME |
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#error "Multiple defines of BOOST_LAMBDA_COMMA_OPERATOR_NAME" |
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#endif |
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#define BOOST_LAMBDA_COMMA_OPERATOR_NAME operator, |
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BOOST_LAMBDA_BE1(BOOST_LAMBDA_COMMA_OPERATOR_NAME, other_action<comma_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE2(BOOST_LAMBDA_COMMA_OPERATOR_NAME, other_action<comma_action>, const A, const B, const_copy_argument) |
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BOOST_LAMBDA_BE3(BOOST_LAMBDA_COMMA_OPERATOR_NAME, other_action<comma_action>, const A, const B, const_copy_argument) |
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namespace detail { |
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// special cases for ostream& << Any and istream& >> Any --------------- |
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// the actual stream classes may vary and thus a specialisation for, |
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// say ostream& does not match (the general case above is chosen). |
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// Therefore we specialise for non-const reference: |
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// if the left argument is a stream, we store the stream as reference |
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// if it is something else, we store a const plain by default |
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// Note that the overloading is const vs. non-const first argument |
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#ifdef BOOST_NO_TEMPLATED_STREAMS |
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template<class T> struct convert_ostream_to_ref_others_to_c_plain_by_default { |
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typedef typename detail::IF< |
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boost::is_convertible<T*, std::ostream*>::value, |
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T&, |
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typename const_copy_argument <T>::type |
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>::RET type; |
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}; |
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template<class T> struct convert_istream_to_ref_others_to_c_plain_by_default { |
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typedef typename detail::IF< |
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boost::is_convertible<T*, std::istream*>::value, |
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T&, |
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typename const_copy_argument <T>::type |
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>::RET type; |
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}; |
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#else |
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template<class T> struct convert_ostream_to_ref_others_to_c_plain_by_default { |
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typedef typename detail::IF< |
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is_instance_of_2< |
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T, std::basic_ostream |
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>::value, |
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T&, |
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typename const_copy_argument <T>::type |
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>::RET type; |
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}; |
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template<class T> struct convert_istream_to_ref_others_to_c_plain_by_default { |
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typedef typename detail::IF< |
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is_instance_of_2< |
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T, std::basic_istream |
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>::value, |
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T&, |
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typename const_copy_argument <T>::type |
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>::RET type; |
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}; |
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#endif |
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} // detail |
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BOOST_LAMBDA_BE2(operator<<, bitwise_action< leftshift_action>, A, const B, detail::convert_ostream_to_ref_others_to_c_plain_by_default) |
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BOOST_LAMBDA_BE2(operator>>, bitwise_action< rightshift_action>, A, const B, detail::convert_istream_to_ref_others_to_c_plain_by_default) |
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// special case for io_manipulators. |
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// function references cannot be given as arguments to lambda operator |
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// expressions in general. With << and >> the use of manipulators is |
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// so common, that specializations are provided to make them work. |
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template<class Arg, class Ret, class ManipArg> |
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inline const |
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lambda_functor< |
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lambda_functor_base< |
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bitwise_action<leftshift_action>, |
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tuple<lambda_functor<Arg>, Ret(&)(ManipArg)> |
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> |
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> |
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operator<<(const lambda_functor<Arg>& a, Ret(&b)(ManipArg)) |
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{ |
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return |
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lambda_functor_base< |
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bitwise_action<leftshift_action>, |
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tuple<lambda_functor<Arg>, Ret(&)(ManipArg)> |
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> |
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( tuple<lambda_functor<Arg>, Ret(&)(ManipArg)>(a, b) ); |
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} |
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template<class Arg, class Ret, class ManipArg> |
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inline const |
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lambda_functor< |
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lambda_functor_base< |
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bitwise_action<rightshift_action>, |
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tuple<lambda_functor<Arg>, Ret(&)(ManipArg)> |
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> |
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> |
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operator>>(const lambda_functor<Arg>& a, Ret(&b)(ManipArg)) |
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{ |
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return |
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lambda_functor_base< |
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bitwise_action<rightshift_action>, |
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tuple<lambda_functor<Arg>, Ret(&)(ManipArg)> |
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> |
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( tuple<lambda_functor<Arg>, Ret(&)(ManipArg)>(a, b) ); |
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} |
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// (+ and -) take their arguments as const references. |
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// This has consquences with pointer artihmetic |
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// E.g int a[]; ... *a = 1 works but not *(a+1) = 1. |
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// the result of a+1 would be const |
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// To make the latter work too, |
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// non-const arrays are taken as non-const and stored as non-const as well. |
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#if defined BOOST_LAMBDA_PTR_ARITHMETIC_E1 |
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#error "Multiple defines of BOOST_LAMBDA_PTR_ARITHMETIC_E1" |
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#endif |
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#define BOOST_LAMBDA_PTR_ARITHMETIC_E1(OPER_NAME, ACTION, CONSTB) \ |
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template<class Arg, int N, class B> \ |
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inline const \ |
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lambda_functor< \ |
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lambda_functor_base<ACTION, tuple<lambda_functor<Arg>, CONSTB(&)[N]> > \ |
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> \ |
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OPER_NAME (const lambda_functor<Arg>& a, CONSTB(&b)[N]) \ |
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{ \ |
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return \ |
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lambda_functor_base<ACTION, tuple<lambda_functor<Arg>, CONSTB(&)[N]> > \ |
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(tuple<lambda_functor<Arg>, CONSTB(&)[N]>(a, b)); \ |
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} |
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#if defined BOOST_LAMBDA_PTR_ARITHMETIC_E2 |
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#error "Multiple defines of BOOST_LAMBDA_PTR_ARITHMETIC_E2" |
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#endif |
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#define BOOST_LAMBDA_PTR_ARITHMETIC_E2(OPER_NAME, ACTION, CONSTA) \ |
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template<int N, class A, class Arg> \ |
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inline const \ |
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lambda_functor< \ |
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lambda_functor_base<ACTION, tuple<CONSTA(&)[N], lambda_functor<Arg> > > \ |
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> \ |
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OPER_NAME (CONSTA(&a)[N], const lambda_functor<Arg>& b) \ |
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{ \ |
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return \ |
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lambda_functor_base<ACTION, tuple<CONSTA(&)[N], lambda_functor<Arg> > > \ |
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(tuple<CONSTA(&)[N], lambda_functor<Arg> >(a, b)); \ |
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} |
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BOOST_LAMBDA_PTR_ARITHMETIC_E1(operator+, arithmetic_action<plus_action>, B) |
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BOOST_LAMBDA_PTR_ARITHMETIC_E2(operator+, arithmetic_action<plus_action>, A) |
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BOOST_LAMBDA_PTR_ARITHMETIC_E1(operator+, arithmetic_action<plus_action>,const B) |
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BOOST_LAMBDA_PTR_ARITHMETIC_E2(operator+, arithmetic_action<plus_action>,const A) |
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//BOOST_LAMBDA_PTR_ARITHMETIC_E1(operator-, arithmetic_action<minus_action>) |
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// This is not needed, since the result of ptr-ptr is an rvalue anyway |
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BOOST_LAMBDA_PTR_ARITHMETIC_E2(operator-, arithmetic_action<minus_action>, A) |
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BOOST_LAMBDA_PTR_ARITHMETIC_E2(operator-, arithmetic_action<minus_action>, const A) |
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#undef BOOST_LAMBDA_BE1 |
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#undef BOOST_LAMBDA_BE2 |
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#undef BOOST_LAMBDA_BE3 |
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#undef BOOST_LAMBDA_BE |
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#undef BOOST_LAMBDA_COMMA_OPERATOR_NAME |
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#undef BOOST_LAMBDA_PTR_ARITHMETIC_E1 |
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#undef BOOST_LAMBDA_PTR_ARITHMETIC_E2 |
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// --------------------------------------------------------------------- |
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// unary operators ----------------------------------------------------- |
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// --------------------------------------------------------------------- |
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#if defined BOOST_LAMBDA_UE |
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#error "Multiple defines of BOOST_LAMBDA_UE" |
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#endif |
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#define BOOST_LAMBDA_UE(OPER_NAME, ACTION) \ |
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template<class Arg> \ |
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inline const \ |
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lambda_functor<lambda_functor_base<ACTION, tuple<lambda_functor<Arg> > > > \ |
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OPER_NAME (const lambda_functor<Arg>& a) \ |
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{ \ |
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return \ |
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lambda_functor_base<ACTION, tuple<lambda_functor<Arg> > > \ |
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( tuple<lambda_functor<Arg> >(a) ); \ |
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} |
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BOOST_LAMBDA_UE(operator+, unary_arithmetic_action<plus_action>) |
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BOOST_LAMBDA_UE(operator-, unary_arithmetic_action<minus_action>) |
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BOOST_LAMBDA_UE(operator~, bitwise_action<not_action>) |
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BOOST_LAMBDA_UE(operator!, logical_action<not_action>) |
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BOOST_LAMBDA_UE(operator++, pre_increment_decrement_action<increment_action>) |
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BOOST_LAMBDA_UE(operator--, pre_increment_decrement_action<decrement_action>) |
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BOOST_LAMBDA_UE(operator*, other_action<contentsof_action>) |
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BOOST_LAMBDA_UE(operator&, other_action<addressof_action>) |
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#if defined BOOST_LAMBDA_POSTFIX_UE |
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#error "Multiple defines of BOOST_LAMBDA_POSTFIX_UE" |
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#endif |
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#define BOOST_LAMBDA_POSTFIX_UE(OPER_NAME, ACTION) \ |
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template<class Arg> \ |
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inline const \ |
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lambda_functor<lambda_functor_base<ACTION, tuple<lambda_functor<Arg> > > > \ |
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OPER_NAME (const lambda_functor<Arg>& a, int) \ |
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{ \ |
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return \ |
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lambda_functor_base<ACTION, tuple<lambda_functor<Arg> > > \ |
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( tuple<lambda_functor<Arg> >(a) ); \ |
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} |
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BOOST_LAMBDA_POSTFIX_UE(operator++, post_increment_decrement_action<increment_action>) |
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BOOST_LAMBDA_POSTFIX_UE(operator--, post_increment_decrement_action<decrement_action>) |
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#undef BOOST_LAMBDA_UE |
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#undef BOOST_LAMBDA_POSTFIX_UE |
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} // namespace lambda |
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} // namespace boost |
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#endif
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