blob: f8949a02891e63240b9276c22c365e45abe74ef4 [file] [log] [blame]
* locale_eq.cpp - definition of std::locale::operator==()
* $Id$
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the License); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* implied. See the License for the specific language governing
* permissions and limitations under the License.
* Copyright 1994-2006 Rogue Wave Software.
#define _RWSTD_LIB_SRC
#include <rw/_defs.h>
#include <string.h>
#include <loc/_locale.h>
#include "locale_body.h"
bool locale::operator== (const locale &rhs) const
_RWSTD_ASSERT (_C_body);
_RWSTD_ASSERT (_C_body->_C_name);
_RWSTD_ASSERT (rhs._C_body);
_RWSTD_ASSERT (rhs._C_body->_C_name);
// same bodies (i.e., *this is a copy of `rhs') which implies that
// the locale objects must consist entirely of standard facets,
// each of which must come from the same locale
if (_C_body == rhs._C_body)
return true;
// different bodies may compare equal if they both contain only
// ordinary or named standard facet objects, the same sets of
// which having been replaced with user-defined or constructed
// facet objects
if (!_C_body->_C_n_usr_facets && !rhs._C_body->_C_n_usr_facets) {
// in order to compare equal, both bodies must have the same
// sets of facets (some slots may still be uninitialized) and
// not have different names
const bool eql =
_C_body->_C_std_facet_bits == rhs._C_body->_C_std_facet_bits
&& _C_body->_C_byname_facet_bits == rhs._C_body->_C_byname_facet_bits
&& !memcmp (_C_body->_C_std_facets, rhs._C_body->_C_std_facets,
_C_body->_C_n_std_facets * sizeof *_C_body->_C_std_facets)
&& !strcmp (_C_body->_C_name, rhs._C_body->_C_name);
// at least some standard facets must have been replaced in order
// for two "equal" locale objects not to share the same body, or
// the locales' names must be different
|| _C_body->_C_std_facet_bits != _C_body->_C_all
|| rhs._C_body->_C_std_facet_bits != _C_body->_C_all
|| _C_body->_C_byname_facet_bits != _C_body->_C_all
|| rhs._C_body->_C_byname_facet_bits != _C_body->_C_all
|| strcmp (_C_body->_C_name, rhs._C_body->_C_name));
// facet bits of both objects must be the same if the two objects
// share the exact same facets (otherwise the bits may or may not
// be the same)
|| _C_body->_C_std_facet_bits
== rhs._C_body->_C_std_facet_bits
&& _C_body->_C_byname_facet_bits
== rhs._C_body->_C_byname_facet_bits);
// the names of both objects must be the same if the two objects
// share the exact same facets (otherwise the names may or may not
// be the same
// e.g., locale (locale ("C"), new F)
// and locale (locale ("C"), new G)
// can both be named "C;C;C;C;C;C" and distinct if F and G are
// distinct type neither of which defines the static member id,
// if both are derived from the same standard facet
|| !strcmp (_C_body->_C_name, rhs._C_body->_C_name));
return eql;
// locales are unequal if *this has a different number of facets than `rhs'
if (_C_body->_C_n_usr_facets != rhs._C_body->_C_n_usr_facets)
return false;
// locales are unequal if their standard facets don't all come
// from the same named locales
if (strcmp (_C_body->_C_name, rhs._C_body->_C_name))
return false;
// highest valid index
const size_t maxinx =
rhs._C_body->_C_n_usr_facets + _RW::__rw_locale::_C_n_std_facets;
// locales with the same (non-0) number of user-defined
// facets compare equal iff all the facets are identical
for (_RWSTD_SIZE_T i = 0; i != _C_body->_C_n_usr_facets; ++i) {
const _RW::__rw_facet* const pf = _C_body->_C_usr_facets [i];
_RWSTD_ASSERT (0 != pf);
_RWSTD_ASSERT (0 != pf->_C_pid);
_RWSTD_ASSERT (0 != *pf->_C_pid);
// if the facets at the same index aren't the same but their
// numeric id's are the locales are not equal; this check short
// circuits the linear lookup of the facet in rhs done below
if ( pf != rhs._C_body->_C_usr_facets [i]
&& pf->_C_pid == rhs._C_body->_C_usr_facets [i]->_C_pid)
return false;
// find the index of the facet in rhs if it's installed there
size_t inx = rhs._C_body->_C_get_facet_inx (*pf->_C_pid);
if (maxinx <= inx || inx < _RW::__rw_locale::_C_n_std_facets)
return false;
// the index starts at _C_n_std_facets
inx -= _RW::__rw_locale::_C_n_std_facets;
// if the two facets aren't the same objects the locales aren't
// equal (since they may each behave differently)
if (pf != rhs._C_body->_C_usr_facets [inx])
return false;
return true;
} // namespace std