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/*
* Copyright (c) 2003-2008, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _COMPARE_H
#define _COMPARE_H
#include "expr.h"
#include "xact.h"
#include "account.h"
namespace ledger {
template <typename T>
class compare_items
{
expr_t sort_order;
compare_items();
public:
compare_items(const compare_items& other) : sort_order(other.sort_order) {
TRACE_CTOR(compare_items, "copy");
}
compare_items(const expr_t& _sort_order) : sort_order(_sort_order) {
TRACE_CTOR(compare_items, "const value_expr&");
}
~compare_items() throw() {
TRACE_DTOR(compare_items);
}
bool operator()(T * left, T * right);
};
template <typename T>
bool compare_items<T>::operator()(T * left, T * right)
{
assert(left);
assert(right);
return sort_order.calc(*left) < sort_order.calc(*right);
}
template <>
bool compare_items<xact_t>::operator()(xact_t * left, xact_t * right);
template <>
bool compare_items<account_t>::operator()(account_t * left,
account_t * right);
} // namespace ledger
#endif // _COMPARE_H
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