arene::base::full_ordering_operators_from_less_than< Derived, Other > Class Template Reference

Helper class that can be inherited from by a class to define the >, <=, >=, == and != operators in terms of a < operator that the derived class provides. More...

Inheritance diagram for arene::base::full_ordering_operators_from_less_than< Derived, Other >:

Friends
ARENE_NODISCARD friend constexpr auto	operator== (Derived const &lhs, Other const &rhs) noexcept -> bool
	Greater-than-or-equal comparison operator for instances of LhsType and RhsType.

Detailed Description

template<typename Derived, typename Other = Derived>
class arene::base::full_ordering_operators_from_less_than< Derived, Other >

Helper class that can be inherited from by a class to define the >, <=, >=, == and != operators in terms of a < operator that the derived class provides.

The derived class is required to provide:

• operator<(const Derived&, const Other&)
• operator<(const Other&, const Derived&)

This class defines the following operators in terms of those:

• operator>(const Derived&, const Other&)
• operator<=(const Derived&, const Other&)
• operator>=(const Derived&, const Other&)
• operator==(const Derived&, const Other&)
• operator!=(const Derived&, const Other&)
• operator>(const Other&, const Derived&)
• operator<=(const Other&, const Derived&)
• operator>=(const Other&, const Derived&)
• operator==(const Other&, const Derived&)
• operator!=(const Other&, const Derived&)

For example:

class MyString : arene::base::full_ordering_operators_from_less_than<MyString,
const char*> {
  ...
  // Only need to define less-than. Others defined in terms of this.
  friend bool operator<(const MyString& a, const char* b) noexcept;
  friend bool operator<(const char* a, const MyString& b) noexcept;
};

Friends And Related Symbol Documentation

operator==

template<typename Derived, typename Other = Derived>

ARENE_NODISCARD friend constexpr auto operator== ( Derived const & lhs, Other const & rhs ) -> bool

friend

Greater-than-or-equal comparison operator for instances of LhsType and RhsType.

Parameters

lhs	The first object being compared
rhs	The second object being compared

Returns

True if lhs is greater than or equal to rhs, false otherwise.

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The documentation for this class was generated from the following file:

• arene/base/compare/operators.hpp