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Commitddc8bdf

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SFINAE for choosing 'write' overload
Aside from adding an additional clarification in the documentation forthe macro defining the size of a page, this change makes the user-facing'write' implementation use SFINAE to choose whether to deal with thebuffer provided as a buffer that doesn't need to be copied (derives fromBoost.Asio's const_buffer type) or whether it's something that needs tobe copied (in the case of any other range).In the future there should be other overloads which deal with explicitBoost.Range iterator ranges, and maybe specific types.
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‎boost/network/protocol/http/server/async_connection.hpp

Lines changed: 9 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -24,6 +24,7 @@
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#include<boost/utility/typed_in_place_factory.hpp>
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#include<boost/thread/locks.hpp>
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#include<boost/thread/recursive_mutex.hpp>
27+
#include<boost/utility/enable_if.hpp>
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#include<list>
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#include<vector>
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#include<iterator>
@@ -35,6 +36,10 @@
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* This is the maximum size though and Boost.Asio's internal representation
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* of a streambuf would make appropriate decisions on how big a buffer
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* is to begin with.
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*
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* This kinda assumes that a page is by default 4096. Since we're using
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* the default allocator with the static buffers, it's not guaranteed that
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* the static buffers will be page-aligned when they are allocated.
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*/
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#defineBOOST_NETWORK_HTTP_SERVER_CONNECTION_HEADER_BUFFER_MAX_SIZE4096
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#endif/* BOOST_NETWORK_HTTP_SERVER_CONNECTION_HEADER_BUFFER_MAX_SIZE*/
@@ -211,14 +216,16 @@ namespace boost { namespace network { namespace http {
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}
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template<classRange,classCallback>
214-
voidwrite(Rangeconst & range, Callbackconst & callback) {
219+
typename disable_if<is_base_of<asio::const_buffer, Range>,void>::type
220+
write(Rangeconst & range, Callbackconst & callback) {
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lock_guardlock(headers_mutex);
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if (error_encountered)boost::throw_exception(boost::system::system_error(*error_encountered));
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write_impl(boost::make_iterator_range(range), callback);
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}
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template<classConstBufferSeq,classCallback>
221-
voidwrite_vec(ConstBufferSeqconst & seq, Callbackconst & callback)
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typename enable_if<is_base_of<asio::const_buffer, ConstBufferSeq>,void>::type
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write(ConstBufferSeqconst & seq, Callbackconst & callback)
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{
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write_vec_impl(seq, callback,shared_array_list(),shared_buffers());
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}

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