std::rethrow_exception

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

#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

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

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