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PR libstdc++/40296 * libsupc++/exception_ptr.h (exception_ptr::exception_ptr): Replace __safe_bool constructor with nullptr_t constructor in C++0x mode. (exception_ptr::operator bool): Add explicit conversion to bool. (swap(exception_ptr&, exception_ptr&)): Add. (exception_ptr::_M_safe_bool_dummy): Only declare for old ABI. * libsupc++/eh_ptr.cc (exception_ptr::_M_safe_bool_dummy): Move next to other functions retained for ABI compatibility. * testsuite/18_support/exception_ptr/requirements.cc: New. * testsuite/18_support/exception_ptr/requirements_neg.cc: New. As stated in PR 40296, the FCD adds new requirements for exception_ptr. This patch implements the contextual conversion to bool as well as replacing the safebool constructor with a nullptr_t constructor, which means std::exception_ptr(nullptr) is no longer ambiguous. I also added a swap overload as an optimisation to avoid using the default std::swap implementation. Tested x86_64/Linux, committed to trunk.
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