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# operator==,!=,<,<=,>,>=(std::experimental::propagate_const)

From cppreference.com
< cpp‎ | experimental‎ | propagate const

template <class T> constexpr bool operator==(const propagate_const<T>& pt, nullptr_t); | (1) | (library fundamentals TS v2)
template <class T> constexpr bool operator==(nullptr_t, const propagate_const<T>& pt); | (2) | (library fundamentals TS v2)
template <class T> constexpr bool operator!=(const propagate_const<T>& pt, nullptr_t); | (3) | (library fundamentals TS v2)
template <class T> constexpr bool operator!=(nullptr_t, const propagate_const<T>& pt); | (4) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator==(const propagate_const<T>& pt, const propagate_const<U>& pu); | (5) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator!=(const propagate_const<T>& pt, const propagate_const<U>& pu); | (6) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator<(const propagate_const<T>& pt, const propagate_const<U>& pu); | (7) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator>(const propagate_const<T>& pt, const propagate_const<U>& pu); | (8) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator<=(const propagate_const<T>& pt, const propagate_const<U>& pu); | (9) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator>=(const propagate_const<T>& pt, const propagate_const<U>& pu); | (10) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator==(const propagate_const<T>& pt, const U& u); | (11) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator!=(const propagate_const<T>& pt, const U& u); | (12) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator<(const propagate_const<T>& pt, const U& u); | (13) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator>(const propagate_const<T>& pt, const U& u); | (14) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator<=(const propagate_const<T>& pt, const U& u); | (15) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator>=(const propagate_const<T>& pt, const U& u); | (16) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator==(const T& t, const propagate_const<U>& pu); | (17) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator!=(const T& t, const propagate_const<U>& pu); | (18) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator<(const T& t, const propagate_const<U>& pu); | (19) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator>(const T& t, const propagate_const<U>& pu); | (20) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator<=(const T& t, const propagate_const<U>& pu); | (21) | (library fundamentals TS v2)
template <class T, class U> constexpr bool operator>=(const T& t, const propagate_const<U>& pu); | (22) | (library fundamentals TS v2)

Compares the wrapped pointers of two `propagate_const`s, or between a `propagate_const` and nullptr, or between a `propagate_const` and another object.

1-4) Equality comparison for a `propagate_const` and nullptr.
5-6) Equality comparison for two `propagate_const`s
7-10) Ordered comparison for two `propagate_const`s
11-14) Equality comparison for a `propagate_const` and another object.
15-22) Equality comparison for a `propagate_const` and another object.

### [edit] Parameters

pt, pu | - | `propagate_const`s to compare
t, u | - | other objects to compare

### [edit] Return value

Let `t_` denote the underlying pointer-like object wrapped by a `propagate_const`.

1) pt.t_ == nullptr
2) nullptr == pt.t_
3) pt.t_ != nullptr
4) nullptr != pt.t_
5) pt.t_ == pu.t_
6) pt.t_ != pu.t_
7) pt.t_ < pu.t_
8) pt.t_ > pu.t_
9) pt.t_ <= pu.t_
10) pt.t_ >= pu.t_
11) pt.t_ == u
12) pt.t_ != u
13) pt.t_ < u
14) pt.t_ > u
15) pt.t_ <= u
16) pt.t_ >= u
17) t == pu.t_
18) t != pu.t_
19) t < pu.t_
20) t > pu.t_
21) t <= pu.t_
22) t >= pu.t_
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