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std::type_index::operator==,!=,<,<=,>,>=,<=> - cppreference.com

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bool operator==( const type_index& rhs ) const noexcept;

 (1) (since C++11)

bool operator!=( const type_index& rhs ) const noexcept;

 (2) (since C++11)
(until C++20)

bool operator<( const type_index& rhs ) const noexcept;

 (3) (since C++11)

bool operator<=( const type_index& rhs ) const noexcept;

 (4) (since C++11)

bool operator>( const type_index& rhs ) const noexcept;

 (5) (since C++11)

bool operator>=( const type_index& rhs ) const noexcept;

 (6) (since C++11)

std::strong_ordering operator<=>( const type_index& rhs ) const noexcept;

 (7) (since C++20)

Compares the underlying std::type_info objects.

1,2) Checks whether the underlying std::type_info objects refer to the same type.

3-7) Compares the underlying std::type_info objects as defined by an implementation-defined ordering. The comparison is done by

type_info::before

.

The != operator is synthesized from operator==.

(since C++20)

Parameters

rhs - another type_index object to compare to

Return value

1) true if the underlying std::type_info objects refer to the same type, false otherwise.

2) true if the underlying std::type_info objects refer not to the same type, false otherwise.

3-6) true if the types referred by the underlying std::type_info objects are ordered by corresponding order, false otherwise.

7) std::strong_ordering::equal if the underlying std::type_info objects refer to the same type, otherwise std::strong_ordering::less if *this's underlying std::type_info object precedes rhs's in the implementation-defined ordering, otherwise std::strong_ordering::greater.