Opened 12 years ago
Closed 11 years ago
#4832 closed Feature Requests (worksforme)
C++0x lambdas do not work as argument to Boost::Range's transformed adaptor
| Reported by: | Owned by: | Douglas Gregor | |
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| Milestone: | To Be Determined | Component: | utility |
| Version: | Boost Development Trunk | Severity: | Problem |
| Keywords: | c++0x lambda transformed boost::range | Cc: |
Description
You cannot use lambda functions as parameters to transformed adaptor. At least on Visual Studio 2010.
This is due to native inability to take a result_of the lambda function.
A simple workaround for Visual Studio 2010 is offered (see attached patch for trunk 66478). If it is applied and checked to work on other compilers, please update.
Attachments (1)
Change History (6)
by , 12 years ago
| Attachment: | lambda.patch added |
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comment:1 by , 12 years ago
| Version: | Boost 1.44.0 → Boost Development Trunk |
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follow-up: 3 comment:2 by , 12 years ago
| Component: | range → utility |
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| Owner: | changed from to |
I have recently reaalized the solution requires a modification to result_of rather than a change to Boost.Range.
comment:3 by , 12 years ago
Replying to neilgroves:
I have recently reaalized the solution requires a modification to result_of rather than a change to Boost.Range.
Agree. It seems that range lib in trunk started to use boost's result_of (compared to its own implementation in 1.44). My patch addresses variant with a single argument for VC 2010 and needs to be extended for multiple arguments using standard "preprocessor magic". If I get a working variant for multiple arguments, I will update the ticket.
comment:4 by , 12 years ago
If the compiler has decltype, most of the logic in result_of is unnecessary.
comment:5 by , 11 years ago
| Resolution: | → worksforme |
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| Status: | new → closed |
With BOOST_RESULT_OF_USE_DECLTYPE, boost::result_of and C++0x lambdas work fine.
Please see the documentation for usage of BOOST_RESULT_OF_USE_DECLTYPE:
http://www.boost.org/doc/libs/1_47_0/libs/utility/utility.htm#result_of
(On Visual Studio 2010, using BOOST_RESULT_OF_USE_DECLTYPE works fine
with Boost 1.47 and trunk. But it might not work with older versions of Boost,
since BOOST_NO_DECLTYPE is defined for that compiler. )
patch for boost/utility/result_of.hpp