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bind_handler works with boost placeholders

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This commit is contained in:
Vinnie Falco
2018-01-26 10:12:40 -08:00
parent 2f03cc7895
commit c9bbf7bdbc
2 changed files with 25 additions and 5 deletions
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1
CHANGELOG.md
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@@ -2,6 +2,7 @@ Version 154:
* Type check completion handlers * Type check completion handlers
* bind_handler doc update * bind_handler doc update
* bind_handler works with boost placeholders
-------------------------------------------------------------------------------- --------------------------------------------------------------------------------

29
include/boost/beast/core/detail/bind_handler.hpp
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@@ -15,6 +15,7 @@
#include <boost/asio/associated_executor.hpp> #include <boost/asio/associated_executor.hpp>
#include <boost/asio/handler_continuation_hook.hpp> #include <boost/asio/handler_continuation_hook.hpp>
#include <boost/core/ignore_unused.hpp> #include <boost/core/ignore_unused.hpp>
#include <boost/is_placeholder.hpp>
#include <functional> #include <functional>
#include <utility> #include <utility>
@@ -45,8 +46,10 @@ class bound_handler
static static
typename std::enable_if< typename std::enable_if<
std::is_placeholder<typename std::is_placeholder<typename
std::decay<Arg>::type>::value == 0 &&
boost::is_placeholder<typename
std::decay<Arg>::type>::value == 0, std::decay<Arg>::type>::value == 0,
Arg&&>::type Arg&&>::type
extract(Arg&& arg, Vals& vals) extract(Arg&& arg, Vals& vals)
{ {
boost::ignore_unused(vals); boost::ignore_unused(vals);
@@ -58,10 +61,10 @@ class bound_handler
typename std::enable_if< typename std::enable_if<
std::is_placeholder<typename std::is_placeholder<typename
std::decay<Arg>::type>::value != 0, std::decay<Arg>::type>::value != 0,
typename std::tuple_element< typename std::tuple_element<
std::is_placeholder< std::is_placeholder<
typename std::decay<Arg>::type>::value - 1, typename std::decay<Arg>::type>::value - 1,
Vals>::type&&>::type Vals>>::type::type&&
extract(Arg&&, Vals&& vals) extract(Arg&&, Vals&& vals)
{ {
return std::get<std::is_placeholder< return std::get<std::is_placeholder<
@@ -69,6 +72,22 @@ class bound_handler
std::forward<Vals>(vals)); std::forward<Vals>(vals));
} }
template<class Arg, class Vals>
static
typename std::enable_if<
boost::is_placeholder<typename
std::decay<Arg>::type>::value != 0,
typename std::tuple_element<
boost::is_placeholder<
typename std::decay<Arg>::type>::value - 1,
Vals>>::type::type&&
extract(Arg&&, Vals&& vals)
{
return std::get<boost::is_placeholder<
typename std::decay<Arg>::type>::value - 1>(
std::forward<Vals>(vals));
}
template< template<
class ArgsTuple, class ArgsTuple,
std::size_t... S> std::size_t... S>