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

function

<exception>

[[noreturn]] void terminate() noexcept;

Function handling termination on exception

By default, the terminate handler calls abort. But this behavior can be redefined by calling set_terminate.

This function is automatically called when no catch handler can be found for a thrown exception, or for some other exceptional circumstance that makes impossible to continue the exception handling process.

This function is provided so that the terminate handler can be explicitly called by a program that needs to abnormally terminate, and works even if set_terminate has not been used to set a custom terminate handler (calling abort in this case).

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// terminate example
#include <iostream>       // std::cout, std::cerr
#include <exception>      // std::exception, std::terminate

int main (void) {
  char* p;
  std::cout << "Attempting to allocate 1 GiB...";
  try {
    p = new char [1024*1024*1024];
  }
  catch (std::exception& e) {
    std::cerr << "ERROR: could not allocate storage\n";
    std::terminate();
  }
  std::cout << "Ok\n";
  delete[] p;
  return 0;
}

Attempting to allocate 1 GiB... Ok

set_terminate

Set terminate handler function (function)

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