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    std::indirect_strict_weak_order

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    Defined in header <iterator> 
    template<class F, class I1, class I2 = I1>
concept indirect_strict_weak_order =
  std::indirectly_readable<I1> &&
  std::indirectly_readable<I2> &&
  std::copy_constructible<F> &&
  std::strict_weak_order<F&, std::iter_value_t<I1>&, std::iter_value_t<I2>&> &&
  std::strict_weak_order<F&, std::iter_value_t<I1>&, std::iter_reference_t<I2>> &&
  std::strict_weak_order<F&, std::iter_reference_t<I1>, std::iter_value_t<I2>&> &&
  std::strict_weak_order<F&, std::iter_reference_t<I1>, std::iter_reference_t<I2>> &&
  std::strict_weak_order<F&, std::iter_common_reference_t<I1>, std::iter_common_reference_t<I2>>;
    		(since C++20)

    The concept indirect_strict_weak_order specifies requirements for algorithms that call strict weak orders as their arguments. The key difference between this concept and std::strict_weak_order is that it is applied to the types that I1 and I2 references, rather than I1 and I2 themselves.

    Semantic requirements

    F, I1, and I2 model indirect_strict_weak_order only if all concepts it subsumes are modeled.

    Equality preservation

    Expressions declared in requires expressions of the standard library concepts are required to be equality-preserving (except where stated otherwise).