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SFINAE-ize the server_base metafunction

The server_base metafunction type serves as a means for choosing which implementation basethe server will be deriving from. The SFINAE technique is used to enable the appropriateimplementation of the type depending on the tag dispatch mechanism being utilized throughoutthe implementation.

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boost/network/protocol/http
- server.hpp

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+14

-12

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`‎boost/network/protocol/http/server.hpp`

Lines changed: 14 additions & 12 deletions

Original file line number	Diff line number	Diff line change
`@@ -16,19 +16,21 @@`
`16`	`16`	`#include<boost/network/protocol/http/server/parameters.hpp>`
`17`	`17`
`18`	`18`	`namespaceboost {namespacenetwork {namespacehttp {`
`19`		`-`
	`19`	`+`
	`20`	`+template<classTag,classHandler,classEnable =void>`
	`21`	`+structserver_base {`
	`22`	`+typedef unsupported_tag<Tag> type;`
	`23`	`+ };`
	`24`	`+`
`20`	`25`	`template<classTag,classHandler>`
`21`		`-structserver_base :`
`22`		`- mpl::if_<`
`23`		`- is_async<Tag>`
`24`		`- , async_server_base<Tag, Handler>`
`25`		`- ,typename mpl::if_<`
`26`		`- is_sync<Tag>`
`27`		`- , sync_server_base<Tag, Handler>`
`28`		`- , unsupported_tag<Tag>`
`29`		`- >::type`
`30`		`- >`
`31`		`- {};`
	`26`	`+structserver_base<Tag, Handler,typename enable_if<is_async<Tag> >::type> {`
	`27`	`+typedef async_server_base<Tag, Handler> type;`
	`28`	`+ };`
	`29`	`+`
	`30`	`+template<classTag,classHandler>`
	`31`	`+structserver_base<Tag, Handler,typename enable_if<is_sync<Tag> >::type> {`
	`32`	`+typedef sync_server_base<Tag, Handler> type;`
	`33`	`+ };`
`32`	`34`
`33`	`35`	`template<classTag,classHandler>`
`34`	`36`	`structbasic_server : server_base<Tag, Handler>::type`

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Commitba96b4f

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`‎boost/network/protocol/http/server.hpp`

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