compare.h

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/*
 * Copyright (c) 2003-2023, John Wiegley.  All rights reserved.
 *
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#pragma once
 
#include "expr.h"
 
namespace ledger {
 
class post_t;
class account_t;
class report_t;
 
void push_sort_value(std::list<sort_value_t>& sort_values,
                     expr_t::ptr_op_t node, scope_t& scope);
 
template <typename T>
class compare_items
{
  expr_t sort_order;
  report_t& report;
 
  compare_items();
 
public:
  compare_items(const expr_t& _sort_order, report_t& _report) :
    sort_order(_sort_order), report(_report) {
    TRACE_CTOR(compare_items, "const value_expr&, report_t&");
  }
  compare_items(const compare_items& other) :
    sort_order(other.sort_order), report(other.report) {
    TRACE_CTOR(compare_items, "copy");
  }
  ~compare_items() throw() {
    TRACE_DTOR(compare_items);
  }
 
  void find_sort_values(std::list<sort_value_t>& sort_values, scope_t& scope);
 
  bool operator()(T * left, T * right);
};
 
sort_value_t calc_sort_value(const expr_t::ptr_op_t op);
 
template <typename T>
bool compare_items<T>::operator()(T * left, T * right)
{
  assert(left); assert(right);
  return sort_value_is_less_than(find_sort_values(left),
                                 find_sort_values(right));
}
 
template <>
bool compare_items<post_t>::operator()(post_t * left, post_t * right);
template <>
bool compare_items<account_t>::operator()(account_t * left,
                                          account_t * right);
 
} // namespace ledger