| // Boost operators.hpp header file ----------------------------------------// |
| |
| // (C) Copyright David Abrahams, Jeremy Siek, Daryle Walker 1999-2001. |
| // (C) Copyright Daniel Frey 2002-2016. |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| // See http://www.boost.org/libs/utility/operators.htm for documentation. |
| |
| // Revision History |
| // 22 Feb 16 Added ADL protection, preserve old work-arounds in |
| // operators_v1.hpp and clean up this file. (Daniel Frey) |
| // 16 Dec 10 Limit warning suppression for 4284 to older versions of VC++ |
| // (Matthew Bradbury, fixes #4432) |
| // 07 Aug 08 Added "euclidean" spelling. (Daniel Frey) |
| // 03 Apr 08 Make sure "convertible to bool" is sufficient |
| // for T::operator<, etc. (Daniel Frey) |
| // 24 May 07 Changed empty_base to depend on T, see |
| // http://svn.boost.org/trac/boost/ticket/979 |
| // 21 Oct 02 Modified implementation of operators to allow compilers with a |
| // correct named return value optimization (NRVO) to produce optimal |
| // code. (Daniel Frey) |
| // 02 Dec 01 Bug fixed in random_access_iteratable. (Helmut Zeisel) |
| // 28 Sep 01 Factored out iterator operator groups. (Daryle Walker) |
| // 27 Aug 01 'left' form for non commutative operators added; |
| // additional classes for groups of related operators added; |
| // workaround for empty base class optimization |
| // bug of GCC 3.0 (Helmut Zeisel) |
| // 25 Jun 01 output_iterator_helper changes: removed default template |
| // parameters, added support for self-proxying, additional |
| // documentation and tests (Aleksey Gurtovoy) |
| // 29 May 01 Added operator classes for << and >>. Added input and output |
| // iterator helper classes. Added classes to connect equality and |
| // relational operators. Added classes for groups of related |
| // operators. Reimplemented example operator and iterator helper |
| // classes in terms of the new groups. (Daryle Walker, with help |
| // from Alexy Gurtovoy) |
| // 11 Feb 01 Fixed bugs in the iterator helpers which prevented explicitly |
| // supplied arguments from actually being used (Dave Abrahams) |
| // 04 Jul 00 Fixed NO_OPERATORS_IN_NAMESPACE bugs, major cleanup and |
| // refactoring of compiler workarounds, additional documentation |
| // (Alexy Gurtovoy and Mark Rodgers with some help and prompting from |
| // Dave Abrahams) |
| // 28 Jun 00 General cleanup and integration of bugfixes from Mark Rodgers and |
| // Jeremy Siek (Dave Abrahams) |
| // 20 Jun 00 Changes to accommodate Borland C++Builder 4 and Borland C++ 5.5 |
| // (Mark Rodgers) |
| // 20 Jun 00 Minor fixes to the prior revision (Aleksey Gurtovoy) |
| // 10 Jun 00 Support for the base class chaining technique was added |
| // (Aleksey Gurtovoy). See documentation and the comments below |
| // for the details. |
| // 12 Dec 99 Initial version with iterator operators (Jeremy Siek) |
| // 18 Nov 99 Change name "divideable" to "dividable", remove unnecessary |
| // specializations of dividable, subtractable, modable (Ed Brey) |
| // 17 Nov 99 Add comments (Beman Dawes) |
| // Remove unnecessary specialization of operators<> (Ed Brey) |
| // 15 Nov 99 Fix less_than_comparable<T,U> second operand type for first two |
| // operators.(Beman Dawes) |
| // 12 Nov 99 Add operators templates (Ed Brey) |
| // 11 Nov 99 Add single template parameter version for compilers without |
| // partial specialization (Beman Dawes) |
| // 10 Nov 99 Initial version |
| |
| // 10 Jun 00: |
| // An additional optional template parameter was added to most of |
| // operator templates to support the base class chaining technique (see |
| // documentation for the details). Unfortunately, a straightforward |
| // implementation of this change would have broken compatibility with the |
| // previous version of the library by making it impossible to use the same |
| // template name (e.g. 'addable') for both the 1- and 2-argument versions of |
| // an operator template. This implementation solves the backward-compatibility |
| // issue at the cost of some simplicity. |
| // |
| // One of the complications is an existence of special auxiliary class template |
| // 'is_chained_base<>' (see 'operators_detail' namespace below), which is used |
| // to determine whether its template parameter is a library's operator template |
| // or not. You have to specialize 'is_chained_base<>' for each new |
| // operator template you add to the library. |
| // |
| // However, most of the non-trivial implementation details are hidden behind |
| // several local macros defined below, and as soon as you understand them, |
| // you understand the whole library implementation. |
| |
| #ifndef BOOST_OPERATORS_HPP |
| #define BOOST_OPERATORS_HPP |
| |
| // If old work-arounds are needed, refer to the preserved version without |
| // ADL protection. |
| #if defined(BOOST_NO_OPERATORS_IN_NAMESPACE) || defined(BOOST_USE_OPERATORS_V1) |
| #include "operators_v1.hpp" |
| #else |
| |
| #include <cstddef> |
| #include <iterator> |
| |
| #include <boost/config.hpp> |
| #include <boost/detail/workaround.hpp> |
| |
| #if defined(__sgi) && !defined(__GNUC__) |
| # pragma set woff 1234 |
| #endif |
| |
| #if BOOST_WORKAROUND(BOOST_MSVC, < 1600) |
| # pragma warning( disable : 4284 ) // complaint about return type of |
| #endif // operator-> not begin a UDT |
| |
| // In this section we supply the xxxx1 and xxxx2 forms of the operator |
| // templates, which are explicitly targeted at the 1-type-argument and |
| // 2-type-argument operator forms, respectively. |
| |
| namespace boost |
| { |
| namespace operators_impl |
| { |
| namespace operators_detail |
| { |
| |
| template <typename T> class empty_base {}; |
| |
| } // namespace operators_detail |
| |
| // Basic operator classes (contributed by Dave Abrahams) ------------------// |
| |
| // Note that friend functions defined in a class are implicitly inline. |
| // See the C++ std, 11.4 [class.friend] paragraph 5 |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct less_than_comparable2 : B |
| { |
| friend bool operator<=(const T& x, const U& y) { return !static_cast<bool>(x > y); } |
| friend bool operator>=(const T& x, const U& y) { return !static_cast<bool>(x < y); } |
| friend bool operator>(const U& x, const T& y) { return y < x; } |
| friend bool operator<(const U& x, const T& y) { return y > x; } |
| friend bool operator<=(const U& x, const T& y) { return !static_cast<bool>(y < x); } |
| friend bool operator>=(const U& x, const T& y) { return !static_cast<bool>(y > x); } |
| }; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct less_than_comparable1 : B |
| { |
| friend bool operator>(const T& x, const T& y) { return y < x; } |
| friend bool operator<=(const T& x, const T& y) { return !static_cast<bool>(y < x); } |
| friend bool operator>=(const T& x, const T& y) { return !static_cast<bool>(x < y); } |
| }; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct equality_comparable2 : B |
| { |
| friend bool operator==(const U& y, const T& x) { return x == y; } |
| friend bool operator!=(const U& y, const T& x) { return !static_cast<bool>(x == y); } |
| friend bool operator!=(const T& y, const U& x) { return !static_cast<bool>(y == x); } |
| }; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct equality_comparable1 : B |
| { |
| friend bool operator!=(const T& x, const T& y) { return !static_cast<bool>(x == y); } |
| }; |
| |
| // A macro which produces "name_2left" from "name". |
| #define BOOST_OPERATOR2_LEFT(name) name##2##_##left |
| |
| // NRVO-friendly implementation (contributed by Daniel Frey) ---------------// |
| |
| #if defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS) |
| |
| // This is the optimal implementation for ISO/ANSI C++, |
| // but it requires the compiler to implement the NRVO. |
| // If the compiler has no NRVO, this is the best symmetric |
| // implementation available. |
| |
| #define BOOST_BINARY_OPERATOR_COMMUTATIVE( NAME, OP ) \ |
| template <class T, class U, class B = operators_detail::empty_base<T> > \ |
| struct NAME##2 : B \ |
| { \ |
| friend T operator OP( const T& lhs, const U& rhs ) \ |
| { T nrv( lhs ); nrv OP##= rhs; return nrv; } \ |
| friend T operator OP( const U& lhs, const T& rhs ) \ |
| { T nrv( rhs ); nrv OP##= lhs; return nrv; } \ |
| }; \ |
| \ |
| template <class T, class B = operators_detail::empty_base<T> > \ |
| struct NAME##1 : B \ |
| { \ |
| friend T operator OP( const T& lhs, const T& rhs ) \ |
| { T nrv( lhs ); nrv OP##= rhs; return nrv; } \ |
| }; |
| |
| #define BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( NAME, OP ) \ |
| template <class T, class U, class B = operators_detail::empty_base<T> > \ |
| struct NAME##2 : B \ |
| { \ |
| friend T operator OP( const T& lhs, const U& rhs ) \ |
| { T nrv( lhs ); nrv OP##= rhs; return nrv; } \ |
| }; \ |
| \ |
| template <class T, class U, class B = operators_detail::empty_base<T> > \ |
| struct BOOST_OPERATOR2_LEFT(NAME) : B \ |
| { \ |
| friend T operator OP( const U& lhs, const T& rhs ) \ |
| { T nrv( lhs ); nrv OP##= rhs; return nrv; } \ |
| }; \ |
| \ |
| template <class T, class B = operators_detail::empty_base<T> > \ |
| struct NAME##1 : B \ |
| { \ |
| friend T operator OP( const T& lhs, const T& rhs ) \ |
| { T nrv( lhs ); nrv OP##= rhs; return nrv; } \ |
| }; |
| |
| #else // defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS) |
| |
| // For compilers without NRVO the following code is optimal, but not |
| // symmetric! Note that the implementation of |
| // BOOST_OPERATOR2_LEFT(NAME) only looks cool, but doesn't provide |
| // optimization opportunities to the compiler :) |
| |
| #define BOOST_BINARY_OPERATOR_COMMUTATIVE( NAME, OP ) \ |
| template <class T, class U, class B = operators_detail::empty_base<T> > \ |
| struct NAME##2 : B \ |
| { \ |
| friend T operator OP( T lhs, const U& rhs ) { return lhs OP##= rhs; } \ |
| friend T operator OP( const U& lhs, T rhs ) { return rhs OP##= lhs; } \ |
| }; \ |
| \ |
| template <class T, class B = operators_detail::empty_base<T> > \ |
| struct NAME##1 : B \ |
| { \ |
| friend T operator OP( T lhs, const T& rhs ) { return lhs OP##= rhs; } \ |
| }; |
| |
| #define BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( NAME, OP ) \ |
| template <class T, class U, class B = operators_detail::empty_base<T> > \ |
| struct NAME##2 : B \ |
| { \ |
| friend T operator OP( T lhs, const U& rhs ) { return lhs OP##= rhs; } \ |
| }; \ |
| \ |
| template <class T, class U, class B = operators_detail::empty_base<T> > \ |
| struct BOOST_OPERATOR2_LEFT(NAME) : B \ |
| { \ |
| friend T operator OP( const U& lhs, const T& rhs ) \ |
| { return T( lhs ) OP##= rhs; } \ |
| }; \ |
| \ |
| template <class T, class B = operators_detail::empty_base<T> > \ |
| struct NAME##1 : B \ |
| { \ |
| friend T operator OP( T lhs, const T& rhs ) { return lhs OP##= rhs; } \ |
| }; |
| |
| #endif // defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS) |
| |
| BOOST_BINARY_OPERATOR_COMMUTATIVE( multipliable, * ) |
| BOOST_BINARY_OPERATOR_COMMUTATIVE( addable, + ) |
| BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( subtractable, - ) |
| BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( dividable, / ) |
| BOOST_BINARY_OPERATOR_NON_COMMUTATIVE( modable, % ) |
| BOOST_BINARY_OPERATOR_COMMUTATIVE( xorable, ^ ) |
| BOOST_BINARY_OPERATOR_COMMUTATIVE( andable, & ) |
| BOOST_BINARY_OPERATOR_COMMUTATIVE( orable, | ) |
| |
| #undef BOOST_BINARY_OPERATOR_COMMUTATIVE |
| #undef BOOST_BINARY_OPERATOR_NON_COMMUTATIVE |
| #undef BOOST_OPERATOR2_LEFT |
| |
| // incrementable and decrementable contributed by Jeremy Siek |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct incrementable : B |
| { |
| friend T operator++(T& x, int) |
| { |
| incrementable_type nrv(x); |
| ++x; |
| return nrv; |
| } |
| private: // The use of this typedef works around a Borland bug |
| typedef T incrementable_type; |
| }; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct decrementable : B |
| { |
| friend T operator--(T& x, int) |
| { |
| decrementable_type nrv(x); |
| --x; |
| return nrv; |
| } |
| private: // The use of this typedef works around a Borland bug |
| typedef T decrementable_type; |
| }; |
| |
| // Iterator operator classes (contributed by Jeremy Siek) ------------------// |
| |
| template <class T, class P, class B = operators_detail::empty_base<T> > |
| struct dereferenceable : B |
| { |
| P operator->() const |
| { |
| return &*static_cast<const T&>(*this); |
| } |
| }; |
| |
| template <class T, class I, class R, class B = operators_detail::empty_base<T> > |
| struct indexable : B |
| { |
| R operator[](I n) const |
| { |
| return *(static_cast<const T&>(*this) + n); |
| } |
| }; |
| |
| // More operator classes (contributed by Daryle Walker) --------------------// |
| // (NRVO-friendly implementation contributed by Daniel Frey) ---------------// |
| |
| #if defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS) |
| |
| #define BOOST_BINARY_OPERATOR( NAME, OP ) \ |
| template <class T, class U, class B = operators_detail::empty_base<T> > \ |
| struct NAME##2 : B \ |
| { \ |
| friend T operator OP( const T& lhs, const U& rhs ) \ |
| { T nrv( lhs ); nrv OP##= rhs; return nrv; } \ |
| }; \ |
| \ |
| template <class T, class B = operators_detail::empty_base<T> > \ |
| struct NAME##1 : B \ |
| { \ |
| friend T operator OP( const T& lhs, const T& rhs ) \ |
| { T nrv( lhs ); nrv OP##= rhs; return nrv; } \ |
| }; |
| |
| #else // defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS) |
| |
| #define BOOST_BINARY_OPERATOR( NAME, OP ) \ |
| template <class T, class U, class B = operators_detail::empty_base<T> > \ |
| struct NAME##2 : B \ |
| { \ |
| friend T operator OP( T lhs, const U& rhs ) { return lhs OP##= rhs; } \ |
| }; \ |
| \ |
| template <class T, class B = operators_detail::empty_base<T> > \ |
| struct NAME##1 : B \ |
| { \ |
| friend T operator OP( T lhs, const T& rhs ) { return lhs OP##= rhs; } \ |
| }; |
| |
| #endif // defined(BOOST_HAS_NRVO) || defined(BOOST_FORCE_SYMMETRIC_OPERATORS) |
| |
| BOOST_BINARY_OPERATOR( left_shiftable, << ) |
| BOOST_BINARY_OPERATOR( right_shiftable, >> ) |
| |
| #undef BOOST_BINARY_OPERATOR |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct equivalent2 : B |
| { |
| friend bool operator==(const T& x, const U& y) |
| { |
| return !static_cast<bool>(x < y) && !static_cast<bool>(x > y); |
| } |
| }; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct equivalent1 : B |
| { |
| friend bool operator==(const T&x, const T&y) |
| { |
| return !static_cast<bool>(x < y) && !static_cast<bool>(y < x); |
| } |
| }; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct partially_ordered2 : B |
| { |
| friend bool operator<=(const T& x, const U& y) |
| { return static_cast<bool>(x < y) || static_cast<bool>(x == y); } |
| friend bool operator>=(const T& x, const U& y) |
| { return static_cast<bool>(x > y) || static_cast<bool>(x == y); } |
| friend bool operator>(const U& x, const T& y) |
| { return y < x; } |
| friend bool operator<(const U& x, const T& y) |
| { return y > x; } |
| friend bool operator<=(const U& x, const T& y) |
| { return static_cast<bool>(y > x) || static_cast<bool>(y == x); } |
| friend bool operator>=(const U& x, const T& y) |
| { return static_cast<bool>(y < x) || static_cast<bool>(y == x); } |
| }; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct partially_ordered1 : B |
| { |
| friend bool operator>(const T& x, const T& y) |
| { return y < x; } |
| friend bool operator<=(const T& x, const T& y) |
| { return static_cast<bool>(x < y) || static_cast<bool>(x == y); } |
| friend bool operator>=(const T& x, const T& y) |
| { return static_cast<bool>(y < x) || static_cast<bool>(x == y); } |
| }; |
| |
| // Combined operator classes (contributed by Daryle Walker) ----------------// |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct totally_ordered2 |
| : less_than_comparable2<T, U |
| , equality_comparable2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct totally_ordered1 |
| : less_than_comparable1<T |
| , equality_comparable1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct additive2 |
| : addable2<T, U |
| , subtractable2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct additive1 |
| : addable1<T |
| , subtractable1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct multiplicative2 |
| : multipliable2<T, U |
| , dividable2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct multiplicative1 |
| : multipliable1<T |
| , dividable1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct integer_multiplicative2 |
| : multiplicative2<T, U |
| , modable2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct integer_multiplicative1 |
| : multiplicative1<T |
| , modable1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct arithmetic2 |
| : additive2<T, U |
| , multiplicative2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct arithmetic1 |
| : additive1<T |
| , multiplicative1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct integer_arithmetic2 |
| : additive2<T, U |
| , integer_multiplicative2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct integer_arithmetic1 |
| : additive1<T |
| , integer_multiplicative1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct bitwise2 |
| : xorable2<T, U |
| , andable2<T, U |
| , orable2<T, U, B |
| > > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct bitwise1 |
| : xorable1<T |
| , andable1<T |
| , orable1<T, B |
| > > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct unit_steppable |
| : incrementable<T |
| , decrementable<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct shiftable2 |
| : left_shiftable2<T, U |
| , right_shiftable2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct shiftable1 |
| : left_shiftable1<T |
| , right_shiftable1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct ring_operators2 |
| : additive2<T, U |
| , subtractable2_left<T, U |
| , multipliable2<T, U, B |
| > > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct ring_operators1 |
| : additive1<T |
| , multipliable1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct ordered_ring_operators2 |
| : ring_operators2<T, U |
| , totally_ordered2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct ordered_ring_operators1 |
| : ring_operators1<T |
| , totally_ordered1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct field_operators2 |
| : ring_operators2<T, U |
| , dividable2<T, U |
| , dividable2_left<T, U, B |
| > > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct field_operators1 |
| : ring_operators1<T |
| , dividable1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct ordered_field_operators2 |
| : field_operators2<T, U |
| , totally_ordered2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct ordered_field_operators1 |
| : field_operators1<T |
| , totally_ordered1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct euclidian_ring_operators2 |
| : ring_operators2<T, U |
| , dividable2<T, U |
| , dividable2_left<T, U |
| , modable2<T, U |
| , modable2_left<T, U, B |
| > > > > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct euclidian_ring_operators1 |
| : ring_operators1<T |
| , dividable1<T |
| , modable1<T, B |
| > > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct ordered_euclidian_ring_operators2 |
| : totally_ordered2<T, U |
| , euclidian_ring_operators2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct ordered_euclidian_ring_operators1 |
| : totally_ordered1<T |
| , euclidian_ring_operators1<T, B |
| > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct euclidean_ring_operators2 |
| : ring_operators2<T, U |
| , dividable2<T, U |
| , dividable2_left<T, U |
| , modable2<T, U |
| , modable2_left<T, U, B |
| > > > > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct euclidean_ring_operators1 |
| : ring_operators1<T |
| , dividable1<T |
| , modable1<T, B |
| > > > {}; |
| |
| template <class T, class U, class B = operators_detail::empty_base<T> > |
| struct ordered_euclidean_ring_operators2 |
| : totally_ordered2<T, U |
| , euclidean_ring_operators2<T, U, B |
| > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct ordered_euclidean_ring_operators1 |
| : totally_ordered1<T |
| , euclidean_ring_operators1<T, B |
| > > {}; |
| |
| template <class T, class P, class B = operators_detail::empty_base<T> > |
| struct input_iteratable |
| : equality_comparable1<T |
| , incrementable<T |
| , dereferenceable<T, P, B |
| > > > {}; |
| |
| template <class T, class B = operators_detail::empty_base<T> > |
| struct output_iteratable |
| : incrementable<T, B |
| > {}; |
| |
| template <class T, class P, class B = operators_detail::empty_base<T> > |
| struct forward_iteratable |
| : input_iteratable<T, P, B |
| > {}; |
| |
| template <class T, class P, class B = operators_detail::empty_base<T> > |
| struct bidirectional_iteratable |
| : forward_iteratable<T, P |
| , decrementable<T, B |
| > > {}; |
| |
| // To avoid repeated derivation from equality_comparable, |
| // which is an indirect base class of bidirectional_iterable, |
| // random_access_iteratable must not be derived from totally_ordered1 |
| // but from less_than_comparable1 only. (Helmut Zeisel, 02-Dec-2001) |
| template <class T, class P, class D, class R, class B = operators_detail::empty_base<T> > |
| struct random_access_iteratable |
| : bidirectional_iteratable<T, P |
| , less_than_comparable1<T |
| , additive2<T, D |
| , indexable<T, D, R, B |
| > > > > {}; |
| |
| |
| // |
| // Here's where we put it all together, defining the xxxx forms of the templates. |
| // We also define specializations of is_chained_base<> for |
| // the xxxx, xxxx1, and xxxx2 templates. |
| // |
| |
| namespace operators_detail |
| { |
| |
| // A type parameter is used instead of a plain bool because Borland's compiler |
| // didn't cope well with the more obvious non-type template parameter. |
| struct true_t {}; |
| struct false_t {}; |
| |
| } // namespace operators_detail |
| |
| // is_chained_base<> - a traits class used to distinguish whether an operator |
| // template argument is being used for base class chaining, or is specifying a |
| // 2nd argument type. |
| |
| // Unspecialized version assumes that most types are not being used for base |
| // class chaining. We specialize for the operator templates defined in this |
| // library. |
| template<class T> struct is_chained_base { |
| typedef operators_detail::false_t value; |
| }; |
| |
| // Provide a specialization of 'is_chained_base<>' |
| // for a 4-type-argument operator template. |
| # define BOOST_OPERATOR_TEMPLATE4(template_name4) \ |
| template<class T, class U, class V, class W, class B> \ |
| struct is_chained_base< template_name4<T, U, V, W, B> > { \ |
| typedef operators_detail::true_t value; \ |
| }; |
| |
| // Provide a specialization of 'is_chained_base<>' |
| // for a 3-type-argument operator template. |
| # define BOOST_OPERATOR_TEMPLATE3(template_name3) \ |
| template<class T, class U, class V, class B> \ |
| struct is_chained_base< template_name3<T, U, V, B> > { \ |
| typedef operators_detail::true_t value; \ |
| }; |
| |
| // Provide a specialization of 'is_chained_base<>' |
| // for a 2-type-argument operator template. |
| # define BOOST_OPERATOR_TEMPLATE2(template_name2) \ |
| template<class T, class U, class B> \ |
| struct is_chained_base< template_name2<T, U, B> > { \ |
| typedef operators_detail::true_t value; \ |
| }; |
| |
| // Provide a specialization of 'is_chained_base<>' |
| // for a 1-type-argument operator template. |
| # define BOOST_OPERATOR_TEMPLATE1(template_name1) \ |
| template<class T, class B> \ |
| struct is_chained_base< template_name1<T, B> > { \ |
| typedef operators_detail::true_t value; \ |
| }; |
| |
| // BOOST_OPERATOR_TEMPLATE(template_name) defines template_name<> such that it |
| // can be used for specifying both 1-argument and 2-argument forms. Requires the |
| // existence of two previously defined class templates named '<template_name>1' |
| // and '<template_name>2' which must implement the corresponding 1- and 2- |
| // argument forms. |
| // |
| // The template type parameter O == is_chained_base<U>::value is used to |
| // distinguish whether the 2nd argument to <template_name> is being used for |
| // base class chaining from another boost operator template or is describing a |
| // 2nd operand type. O == true_t only when U is actually an another operator |
| // template from the library. Partial specialization is used to select an |
| // implementation in terms of either '<template_name>1' or '<template_name>2'. |
| // |
| |
| # define BOOST_OPERATOR_TEMPLATE(template_name) \ |
| template <class T \ |
| ,class U = T \ |
| ,class B = operators_detail::empty_base<T> \ |
| ,class O = typename is_chained_base<U>::value \ |
| > \ |
| struct template_name; \ |
| \ |
| template<class T, class U, class B> \ |
| struct template_name<T, U, B, operators_detail::false_t> \ |
| : template_name##2<T, U, B> {}; \ |
| \ |
| template<class T, class U> \ |
| struct template_name<T, U, operators_detail::empty_base<T>, operators_detail::true_t> \ |
| : template_name##1<T, U> {}; \ |
| \ |
| template <class T, class B> \ |
| struct template_name<T, T, B, operators_detail::false_t> \ |
| : template_name##1<T, B> {}; \ |
| \ |
| template<class T, class U, class B, class O> \ |
| struct is_chained_base< template_name<T, U, B, O> > { \ |
| typedef operators_detail::true_t value; \ |
| }; \ |
| \ |
| BOOST_OPERATOR_TEMPLATE2(template_name##2) \ |
| BOOST_OPERATOR_TEMPLATE1(template_name##1) |
| |
| BOOST_OPERATOR_TEMPLATE(less_than_comparable) |
| BOOST_OPERATOR_TEMPLATE(equality_comparable) |
| BOOST_OPERATOR_TEMPLATE(multipliable) |
| BOOST_OPERATOR_TEMPLATE(addable) |
| BOOST_OPERATOR_TEMPLATE(subtractable) |
| BOOST_OPERATOR_TEMPLATE2(subtractable2_left) |
| BOOST_OPERATOR_TEMPLATE(dividable) |
| BOOST_OPERATOR_TEMPLATE2(dividable2_left) |
| BOOST_OPERATOR_TEMPLATE(modable) |
| BOOST_OPERATOR_TEMPLATE2(modable2_left) |
| BOOST_OPERATOR_TEMPLATE(xorable) |
| BOOST_OPERATOR_TEMPLATE(andable) |
| BOOST_OPERATOR_TEMPLATE(orable) |
| |
| BOOST_OPERATOR_TEMPLATE1(incrementable) |
| BOOST_OPERATOR_TEMPLATE1(decrementable) |
| |
| BOOST_OPERATOR_TEMPLATE2(dereferenceable) |
| BOOST_OPERATOR_TEMPLATE3(indexable) |
| |
| BOOST_OPERATOR_TEMPLATE(left_shiftable) |
| BOOST_OPERATOR_TEMPLATE(right_shiftable) |
| BOOST_OPERATOR_TEMPLATE(equivalent) |
| BOOST_OPERATOR_TEMPLATE(partially_ordered) |
| |
| BOOST_OPERATOR_TEMPLATE(totally_ordered) |
| BOOST_OPERATOR_TEMPLATE(additive) |
| BOOST_OPERATOR_TEMPLATE(multiplicative) |
| BOOST_OPERATOR_TEMPLATE(integer_multiplicative) |
| BOOST_OPERATOR_TEMPLATE(arithmetic) |
| BOOST_OPERATOR_TEMPLATE(integer_arithmetic) |
| BOOST_OPERATOR_TEMPLATE(bitwise) |
| BOOST_OPERATOR_TEMPLATE1(unit_steppable) |
| BOOST_OPERATOR_TEMPLATE(shiftable) |
| BOOST_OPERATOR_TEMPLATE(ring_operators) |
| BOOST_OPERATOR_TEMPLATE(ordered_ring_operators) |
| BOOST_OPERATOR_TEMPLATE(field_operators) |
| BOOST_OPERATOR_TEMPLATE(ordered_field_operators) |
| BOOST_OPERATOR_TEMPLATE(euclidian_ring_operators) |
| BOOST_OPERATOR_TEMPLATE(ordered_euclidian_ring_operators) |
| BOOST_OPERATOR_TEMPLATE(euclidean_ring_operators) |
| BOOST_OPERATOR_TEMPLATE(ordered_euclidean_ring_operators) |
| BOOST_OPERATOR_TEMPLATE2(input_iteratable) |
| BOOST_OPERATOR_TEMPLATE1(output_iteratable) |
| BOOST_OPERATOR_TEMPLATE2(forward_iteratable) |
| BOOST_OPERATOR_TEMPLATE2(bidirectional_iteratable) |
| BOOST_OPERATOR_TEMPLATE4(random_access_iteratable) |
| |
| #undef BOOST_OPERATOR_TEMPLATE |
| #undef BOOST_OPERATOR_TEMPLATE4 |
| #undef BOOST_OPERATOR_TEMPLATE3 |
| #undef BOOST_OPERATOR_TEMPLATE2 |
| #undef BOOST_OPERATOR_TEMPLATE1 |
| |
| template <class T, class U> |
| struct operators2 |
| : totally_ordered2<T,U |
| , integer_arithmetic2<T,U |
| , bitwise2<T,U |
| > > > {}; |
| |
| template <class T, class U = T> |
| struct operators : operators2<T, U> {}; |
| |
| template <class T> struct operators<T, T> |
| : totally_ordered<T |
| , integer_arithmetic<T |
| , bitwise<T |
| , unit_steppable<T |
| > > > > {}; |
| |
| // Iterator helper classes (contributed by Jeremy Siek) -------------------// |
| // (Input and output iterator helpers contributed by Daryle Walker) -------// |
| // (Changed to use combined operator classes by Daryle Walker) ------------// |
| template <class T, |
| class V, |
| class D = std::ptrdiff_t, |
| class P = V const *, |
| class R = V const &> |
| struct input_iterator_helper |
| : input_iteratable<T, P |
| , std::iterator<std::input_iterator_tag, V, D, P, R |
| > > {}; |
| |
| template<class T> |
| struct output_iterator_helper |
| : output_iteratable<T |
| , std::iterator<std::output_iterator_tag, void, void, void, void |
| > > |
| { |
| T& operator*() { return static_cast<T&>(*this); } |
| T& operator++() { return static_cast<T&>(*this); } |
| }; |
| |
| template <class T, |
| class V, |
| class D = std::ptrdiff_t, |
| class P = V*, |
| class R = V&> |
| struct forward_iterator_helper |
| : forward_iteratable<T, P |
| , std::iterator<std::forward_iterator_tag, V, D, P, R |
| > > {}; |
| |
| template <class T, |
| class V, |
| class D = std::ptrdiff_t, |
| class P = V*, |
| class R = V&> |
| struct bidirectional_iterator_helper |
| : bidirectional_iteratable<T, P |
| , std::iterator<std::bidirectional_iterator_tag, V, D, P, R |
| > > {}; |
| |
| template <class T, |
| class V, |
| class D = std::ptrdiff_t, |
| class P = V*, |
| class R = V&> |
| struct random_access_iterator_helper |
| : random_access_iteratable<T, P, D, R |
| , std::iterator<std::random_access_iterator_tag, V, D, P, R |
| > > |
| { |
| friend D requires_difference_operator(const T& x, const T& y) { |
| return x - y; |
| } |
| }; // random_access_iterator_helper |
| |
| } // namespace operators_impl |
| using namespace operators_impl; |
| |
| } // namespace boost |
| |
| #if defined(__sgi) && !defined(__GNUC__) |
| #pragma reset woff 1234 |
| #endif |
| |
| #endif // BOOST_NO_OPERATORS_IN_NAMESPACE |
| #endif // BOOST_OPERATORS_HPP |
