Exception specifications should not be used

Exception specifications never really provided any advantages in C+. They have been deprecated since C11, and removed since C17 (specification with an exception) and C+20 (empty throw specification). If your code still contains some, you should replace empty throw() specifications, with noexcept and remove any other specifications.

Noncompliant Code Example

void f() throw(); // Noncompliant
void g() throw(std::exception); // Noncompliant

Compliant Solution

void f() noexcept;
void g();

See

• C++ Core Guidelines E.30 - Don’t use exception specifications

Exceptions

If a derived class overrides a function with a dynamic exception specification, then the derived function is forced to add a compatible exception specification. Such exception specifications are ignored.