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Add missing variadic template emulation in use_future.

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This commit is contained in:
Christopher Kohlhoff 2017-12-03 22:58:28 +11:00
parent 5c591a4667
commit 4ad7a397ce
1 changed files with 28 additions and 0 deletions
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28
asio/include/asio/impl/use_future.hpp
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@ -543,6 +543,8 @@ template <typename Arg>
class promise_handler_selector<void(std::exception_ptr, Arg)>
: public promise_handler_ex_1<Arg> {};
#if defined(ASIO_HAS_VARIADIC_TEMPLATES)
template <typename... Arg>
class promise_handler_selector<void(Arg...)>
: public promise_handler_n<std::tuple<Arg...> > {};
@ -555,6 +557,32 @@ template <typename... Arg>
class promise_handler_selector<void(std::exception_ptr, Arg...)>
: public promise_handler_ex_n<std::tuple<Arg...> > {};
#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
#define ASIO_PRIVATE_PROMISE_SELECTOR_DEF(n) \
template <typename Arg, ASIO_VARIADIC_TPARAMS(n)> \
class promise_handler_selector< \
void(Arg, ASIO_VARIADIC_TARGS(n))> \
: public promise_handler_n< \
std::tuple<Arg, ASIO_VARIADIC_TARGS(n)> > {}; \
\
template <typename Arg, ASIO_VARIADIC_TPARAMS(n)> \
class promise_handler_selector< \
void(asio::error_code, Arg, ASIO_VARIADIC_TARGS(n))> \
: public promise_handler_ec_n< \
std::tuple<Arg, ASIO_VARIADIC_TARGS(n)> > {}; \
\
template <typename Arg, ASIO_VARIADIC_TPARAMS(n)> \
class promise_handler_selector< \
void(std::exception_ptr, Arg, ASIO_VARIADIC_TARGS(n))> \
: public promise_handler_ex_n< \
std::tuple<Arg, ASIO_VARIADIC_TARGS(n)> > {}; \
/**/
ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_PROMISE_SELECTOR_DEF)
#undef ASIO_PRIVATE_PROMISE_SELECTOR_DEF
#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
// Completion handlers produced from the use_future completion token, when not
// using use_future::operator().
template <typename Signature, typename Allocator>