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Showing content from https://en.cppreference.com/w/cpp/algorithm/../io/ios_base/../../error/exception/operator=.html below:

std::exception::operator= - cppreference.com

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

(until C++11)

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

(since C++11)
(constexpr since C++26)

Copy assignment operator. Assigns the contents of other.

If *this and other both have dynamic type std::exception then std::strcmp(what(), other.what()) == 0 after assignment.

[edit] Parameters other - another exception to assign the contents of [edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 471 C++98 the effects of calling what() after
assignment are implementation-defined required to be the same as the original
what() if the dynamic types are the same

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