std::rethrow_exception (3) Linux Manual Page

std::rethrow_exception – std::rethrow_exception

Synopsis

Defined in header <exception>
[[noreturn]] void rethrow_exception( std::exception_ptr p ) (since C++11)
Throws the previously captured exception object, referred to by the exception pointer p.

Parameters

p – non-null std::exception_ptr

Return value

(none)

Example

// Run this code

#include <iostream>

#include <string>

#include <exception>

#include <stdexcept>
void handle_eptr(std::exception_ptr eptr) // passing by value is ok

{
    try {
        if (eptr) {
            std::rethrow_exception(eptr);
        }
    } catch (const std::exception &e) {
        std::cout << "Caught exception \"" << e.what() << "\"\n";
    }
}
int main()

{
    std::exception_ptr eptr;
    try {
        std::string().at(1); // this generates an std::out_of_range
    } catch (...) {
        eptr = std::current_exception(); // capture
    }
    handle_eptr(eptr);

} // destructor for std::out_of_range called here, when the eptr is destructed

Output:

  Caught exception "basic_string::at"

See also

exception_ptr shared pointer type for handling exception objects
                  (typedef)
(C++11)
current_exception captures the current exception in a std::exception_ptr
                  (function)
(C++11)