Struct template equal_to

Boost C++ Libraries

Struct template equal_to

pfr::equal_to — std::equal_to like comparator that returns pfr::eq (x, y)

Synopsis

// In header: <pfr/functors.hpp>

template<typename T = void> 
struct equal_to {
  // types
  typedef std::true_type is_transparent;  // This typedef exists only if T is void. 

  // public member functions
  bool operator()(const T &, const T &) const;
  template<typename V, typename U> bool operator()(const V &, const U &) const;
};

Description

`equal_to` public member functions

```
bool operator()(const T & x, const T & y) const;
```
Returns:

true if each field of x equals the field with same index of y.

template<typename V, typename U> 
  bool operator()(const V & x, const U & y) const;

This operator allows comparison of x and y that have different type.

Requires:

Exists only if T is void.