// #ifdef STATISTICS
#include "Behavioural/include/Stat_binary_tree.h"

namespace morpheo {
namespace behavioural {

  bool Stat_binary_tree::valid (void)
  {
    if (_data_type == NONE)
      return false;

    if ((_data_type == VARIABLE) or
	(_data_type == CONSTANT))
      return ((_left  == NULL) and
              (_right == NULL) );
    
    if (_data_type == OPERATOR_UNARY)
      return ((_right == NULL) and
              (_left  != NULL) and
              (_left->valid()));

    if (_data_type == OPERATOR_BINARY)
      return ((_left  != NULL ) and
              (_left ->valid()) and
              (_right != NULL ) and
              (_right->valid()));

    return false;
  }

};
};
// #endif