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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../set_terminate.html below:

std::set_terminate - cppreference.com

Makes f the new global terminate handler function and returns the previously installed std::terminate_handler. f shall terminate execution of the program without returning to its caller, otherwise the behavior is undefined.

This function is thread-safe. Every call to std::set_terminate synchronizes-with (see std::memory_order) subsequent calls to std::set_terminate and std::get_terminate.

The previously-installed terminate handler, or a null pointer value if none was installed.

#include <cstdlib>
#include <exception>
#include <iostream>
 
int main()
{
    std::set_terminate([]()
    {
        std::cout << "Unhandled exception\n" << std::flush;
        std::abort();
    });
    throw 1;
}

Possible output:

Unhandled exception
bash: line 7:  7743 Aborted                 (core dumped) ./a.out

The terminate handler will also work for launched threads, so it can be used as an alternative to wrapping the thread function with a try/catch block. In the following example, since the exception is unhandled, std::terminate will be called.

Possible output:

terminate called after throwing an instance of 'std::runtime_error'
  what():  Thread failure
Aborted (core dumped)

With the introduction of the terminate handler, the exception thrown from the non-main thread can be analyzed, and exit can be gracefully performed.

Output:

foo::foo()
Exception: Thread failure
foo::~foo()

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