C ++类中的运算符重载

Question

Trying to overload the < and > operators in a c++ class

 template <typename T>
 bool BinaryTree<T>::operator < (BinaryTree<T> &B) {
   return (this->count < B.setCount(0));
 } 

template <typename T>
float BinaryTree<T>::setCount(float c)
{
  count += c;
  return count;
}

Where setCount(0) returns the count of the B obj. But this always outputs true no matter the numbers compared.

Changes my code to

template <typename T>
bool BinaryTree<T>::operator < (const BinaryTree<T> &B) {
  return (this->count < B.count);
}


printf("%c %lf\n", tree[0]->getData(), tree[0]->setCount(0));
printf("%c %lf\n", tree[1]->getData(), tree[1]->setCount(0));

Output >

a 0.750000
b 0.250000

if(tree[0] < tree[1])
   printf("0 < 1\n");
else printf("1 > 0\n");

Output > 

0 < 1  

Answer 1

This:

  printf("%c %lf\n", tree[0]->getData(), tree[0]->setCount(0));
  printf("%c %lf\n", tree[1]->getData(), tree[1]->setCount(0));

suggests to me that tree holds pointers to your BinaryTree<T> .

Here, you are comparing pointers, ie memory addresses, not values:

if(tree[0] < tree[1])
   printf("0 < 1\n");
else printf("1 > 0\n");

You probably need

if(*(tree[0]) < *(tree[1]))
   printf("0 < 1\n");
else printf("1 > 0\n");