< cpp‎ | error
Diagnostics library
Exception handling
Exception handling failures
(until C++17)
(until C++17)
(C++11)(until C++17)
(until C++17)
Error codes
Error codes
Defined in header <exception>
std::exception_ptr current_exception() noexcept;
(since C++11)

If called during exception handling (typically, in a catch clause), captures the current exception object and creates an std::exception_ptr that holds either a copy or a reference to that exception object (depending on the implementation). The referenced object remains valid at least as long as there is an exception_ptr object that refers to it.

If the implementation of this function requires a call to new and the call fails, the returned pointer will hold a reference to an instance of std::bad_alloc.

If the implementation of this function requires copying the captured exception object and its copy constructor throws an exception, the returned pointer will hold a reference to the exception thrown. If the copy constructor of the thrown exception object also throws, the returned pointer may hold a reference to an instance of std::bad_exception to break the endless loop.

If the function is called when no exception is being handled, an empty std::exception_ptr is returned.


[edit] Parameters


[edit] Return value

An instance of std::exception_ptr holding a reference to the exception object, or a copy of the exception object, or to an instance of std::bad_alloc or to an instance of std::bad_exception.

[edit] Notes

On the implementations that follow Itanium C++ ABI (GCC, Clang, etc), exceptions are allocated on the heap when thrown (except for bad_alloc in some cases), and this function simply creates the smart pointer referencing the previously-allocated object, On MSVC, exceptions are allocated on stack when thrown, and this function performs the heap allocation and copies the exception object.

On Windows in managed CLR environments [1], the implementation will store a std::bad_exception when the current exception is a managed exception ([2]). Note that catch(...) catches also managed exceptions:

#include <exception>
int main() 
  try {
    throw gcnew System::Exception("Managed exception");
  } catch (...) {
    std::exception_ptr ex = std::current_exception();
    try {
    } catch (std::bad_exception const &) {
      // This will be printed.
      std::cout << "Bad exception" << std::endl;

[edit] Example

#include <iostream>
#include <string>
#include <exception>
#include <stdexcept>
void handle_eptr(std::exception_ptr eptr) // passing by value is ok
    try {
        if (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
} // destructor for std::out_of_range called here, when the eptr is destructed

Possible output:

Caught exception "basic_string::at"

[edit] See also

shared pointer type for handling exception objects
(typedef) [edit]
throws the exception from an std::exception_ptr
(function) [edit]
creates an std::exception_ptr from an exception object
(function template) [edit]
checks if exception handling is currently in progress
(function) [edit]