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Showing content from https://cplusplus.com/reference/exception/exception/operator=/ below:

public member function

std::exception::operator=

exception& operator= (const exception& e) throw();

exception& operator= (const exception& e) noexcept;

Copy exception

Copies an exception object.

The effects of calling member

what

after the assignment depend on the particular library implementation.

Every exception within the C++ standard library (including this) has, at least, a copy assignment operator overload that preserves the string representation returned by member

what

when the dynamic types match.

Parameters

e: Another exception object.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
This also applies to all derived classes within the C++ standard library.

See also

exception::exception: Construct exception (public member function)

exception::what: Get string identifying exception (public member function)

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