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Marshall Clow: LWG Issue 2056: future_errc enums start with value 0 (invalid value for broken_promise).

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@190756 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2013-09-14 18:20:10 +00:00
parent a49a2c9deb
commit cd942f1840
3 changed files with 15 additions and 9 deletions
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12
include/future
View File

@ -19,10 +19,10 @@ namespace std
enum class future_errc
{
broken_promise,
future_already_retrieved,
future_already_retrieved = 1,
promise_already_satisfied,
no_state
no_state,
broken_promise
};
enum class launch
@ -379,10 +379,10 @@ _LIBCPP_BEGIN_NAMESPACE_STD
//enum class future_errc
_LIBCPP_DECLARE_STRONG_ENUM(future_errc)
{
broken_promise,
future_already_retrieved,
future_already_retrieved = 1,
promise_already_satisfied,
no_state
no_state,
broken_promise
};
_LIBCPP_DECLARE_STRONG_ENUM_EPILOG(future_errc)

6
src/future.cpp
View File

@ -26,11 +26,15 @@ __future_error_category::name() const _NOEXCEPT
return "future";
}
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wswitch"
string
__future_error_category::message(int ev) const
{
switch (static_cast<future_errc>(ev))
{
case future_errc(0): // For backwards compatibility with C++11 (LWG 2056)
case future_errc::broken_promise:
return string("The associated promise has been destructed prior "
"to the associated state becoming ready.");
@ -46,6 +50,8 @@ __future_error_category::message(int ev) const
return string("unspecified future_errc value\n");
}
#pragma clang diagnostic pop
const error_category&
future_category() _NOEXCEPT
{

6
test/thread/futures/futures.overview/future_errc.pass.cpp
View File

@ -11,18 +11,18 @@
// enum class future_errc
// {
// broken_promise,
// future_already_retrieved,
// future_already_retrieved = 1,
// promise_already_satisfied,
// no_state
// broken_promise,
// };
#include <future>
int main()
{
static_assert(static_cast<int>(std::future_errc::broken_promise) == 0, "");
static_assert(static_cast<int>(std::future_errc::future_already_retrieved) == 1, "");
static_assert(static_cast<int>(std::future_errc::promise_already_satisfied) == 2, "");
static_assert(static_cast<int>(std::future_errc::no_state) == 3, "");
static_assert(static_cast<int>(std::future_errc::broken_promise) == 4, "");
}