# operator==(std::stop_source)

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< cpp‎ | thread‎ | stop source

[[nodiscard]] friend bool operator==( const stop_source& lhs, const stop_source& rhs ) noexcept; |  | (since C++20)

Compares two `stop_source` values.

This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when `std::stop_source` is an associated class of the arguments.

The `!=` operator is synthesized from `operator==`.

### Parameters

lhs, rhs | - | `stop_source`s to compare

### Return value

true if `lhs` and `rhs` have the same stop-state, or both have no stop-state, otherwise false

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