* Attempt to solve issue #10
In boost::current_exception(), after all supported types of exception have
been checked for, a boost::unknown_exception is stored in the
boost::exception_ptr as a last resort to signal that an exception was indeed
stored, but that the actual type and value of the exception was lost.
Now, in case C++11 std::current_exception() is supported, the
std::exception_ptr result of calling std::current_exception() is what
gets stored inside the boost::exception_ptr. Later, inside
boost::rethrow_exception, the std::exception_ptr is retrieved from
the boost::exception_ptr and whatever exception it stores is thrown via
std::rethrow_exception().
The main benefit is than now any exception thrown via plain 'throw'
can be trasnported via boost::exception_ptr. Before this change it was
required that the throw site either used boost::enable_current_exception()
or boost::throw_exception() or threw an exception type inheriting from
boost::exception, which was impossible for third party software
that does not use Boost.Exception.
The detection of std::current_exception() is currently done via config macro
BOOST_NO_CXX11_NOEXCEPT, assuming that if 'noexcept' is supported then
std::exception_ptr is also supported. A better solution would require a new
dedicated macro in Boost.Config.
* Detect support for std::current_exception() via config macro BOOST_NO_CXX11_HDR_EXCEPTION
The temporary solution via BOOST_NO_CXX11_NOEXCEPT was an ugly hack
that is no longer necessary now that Boost.Config has
BOOST_NO_CXX11_HDR_EXCEPTION (pending merge to develop).
* Attempt to solve issue #10
In boost::current_exception(), after all supported types of exception have
been checked for, a boost::unknown_exception is stored in the
boost::exception_ptr as a last resort to signal that an exception was indeed
stored, but that the actual type and value of the exception was lost.
Now, in case C++11 std::current_exception() is supported, the
std::exception_ptr result of calling std::current_exception() is what
gets stored inside the boost::exception_ptr. Later, inside
boost::rethrow_exception, the std::exception_ptr is retrieved from
the boost::exception_ptr and whatever exception it stores is thrown via
std::rethrow_exception().
The main benefit is than now any exception thrown via plain 'throw'
can be trasnported via boost::exception_ptr. Before this change it was
required that the throw site either used boost::enable_current_exception()
or boost::throw_exception() or threw an exception type inheriting from
boost::exception, which was impossible for third party software
that does not use Boost.Exception.
The detection of std::current_exception() is currently done via config macro
BOOST_NO_CXX11_NOEXCEPT, assuming that if 'noexcept' is supported then
std::exception_ptr is also supported. A better solution would require a new
dedicated macro in Boost.Config.
* Detect support for std::current_exception() via config macro BOOST_NO_CXX11_HDR_EXCEPTION
The temporary solution via BOOST_NO_CXX11_NOEXCEPT was an ugly hack
that is no longer necessary now that Boost.Config has
BOOST_NO_CXX11_HDR_EXCEPTION (pending merge to develop).
* Document detection of C++11 std::current_exception through BOOST_NO_CXX11_HDR_EXCEPTION
* Added dist: trusty for Travis config, as recommended by pdimov in issue #10
* Stupid gcc 4.7 and 4.8 are confused initializing a reference with braces, using equal sign hoping it works (tested similar code on godbolt).
