# std::ranges::greater_equal

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< cpp‎ | utility‎ | functional

Defined in header `<functional>` |  |
struct greater_equal; |  | (since C++20)

Function object for performing comparisons. Deduces the parameter types of the function call operator from the arguments (but not the return type).

### Implementation-defined strict total order over pointers

The function call operator yields the implementation-defined strict total order over pointers if the `<` operator between arguments invokes a built-in comparison operator for a pointer, even if the built-in `<` operator does not.

The implementation-defined strict total order is consistent with the partial order imposed by built-in comparison operators (`<=>`, `<`, `>`, `<=`, and `>=`), and consistent among following standard function objects:

- std::less, std::greater, std::less_equal, and std::greater_equal, when the template argument is a pointer type or void

- `std::ranges::equal_to`, `std::ranges::not_equal_to`, `std::ranges::less`, `std::ranges::greater`, `std::ranges::less_equal`, `std::ranges::greater_equal`, and std::compare_three_way

### Member types

Member type | Definition
`is_transparent` | /* unspecified */

### Member functions

operator() | checks if the first argument is greater than or equal to the second (public member function)

## std::ranges::greater_equal::operator()

template< class T, class U > requires std::totally_ordered_with<T, U> // with different semantic requirements constexpr bool operator()(T&& t, U&& u) const; |  |

Compares `t` and `u`. Equivalent to return !ranges::less{}(std::forward<T>(t), std::forward<U>(u));.

### Notes

Unlike std::greater_equal, `std::ranges::greater_equal` requires all six comparison operators `<`, `<=`, `>`, `>=`, `==` and `!=` to be valid (via the `totally_ordered_with` constraint) and is entirely defined in terms of std::ranges::less.

### Example

| This section is incomplete Reason: no example

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 3530 | C++20 | syntactic checks were relaxed while comparing pointers | only semantic requirements relaxed

### See also

greater_equal | function object implementing x >= y (class template)

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