问C++：有效插入和检索自定义数据的数据结构

EN

#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <map>

struct RangeContainer {
  typedef std::map<int,int> RangeMap;
  typedef std::pair<int,int> Range;

  void insert(const Range &range)
  {
    range_map.insert(range);
  }

  Range find(const Range &x) const
  {
    RangeMap::const_iterator iter = range_map.upper_bound(x.second);
    if (iter==range_map.begin()) {
      return invalidRange();
    }
    --iter;
    Range y = *iter;
    if (y.first<x.first && x.second<y.second) {
      return y;
    }

    return invalidRange();
  }

  static Range invalidRange()
  {
    return Range(INT_MAX,INT_MIN);
  }

  RangeMap range_map;
};


static void test1()
{
  RangeContainer c;
  typedef RangeContainer::Range Range;
  c.insert(Range(1,10));
  c.insert(Range(20,30));
  assert(c.find(Range(-5,-4))==c.invalidRange());
  assert(c.find(Range(1,10))==c.invalidRange());
  assert(c.find(Range(2,9))==Range(1,10));
  assert(c.find(Range(2,10))==c.invalidRange());
  assert(c.find(Range(11,19))==c.invalidRange());
  assert(c.find(Range(21,29))==Range(20,30));
  assert(c.find(Range(20,29))==c.invalidRange());
  assert(c.find(Range(21,30))==c.invalidRange());
  assert(c.find(Range(35,40))==c.invalidRange());
}

int main(int argc,char **argv)
{
  test1();
  return EXIT_SUCCESS;
}