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3 Commits

Author SHA1 Message Date
Eric Fiselier
4be71c6619 Recommit r276548 - Make pair/tuples assignment operators SFINAE properly. 
I think I've solved issues with is_assignable and references to incomplete
types. The updated patch adds tests for this case.



git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276603 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-07-25 02:36:42 +00:00
Eric Fiselier
c76d8f7ff4 Revert r276548 - Make pair/tuples assignment operators SFINAE properly. 
This is a breaking change. The SFINAE required is instantiated the second
the class is instantiated, and this can cause hard SFINAE errors
when applied to references to incomplete types. Ex.

struct IncompleteType;
extern IncompleteType it;
std::tuple<IncompleteType&> t(it); // SFINAE will blow up.




git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276598 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-07-25 01:45:07 +00:00
Eric Fiselier
932604f8d1 Don't SFINAE pair's copy assignment operator in C++03 mode. 
In C++03 mode evaluating the SFINAE can cause a hard error due to
access control violations. This is a problem because the SFINAE
is evaluated as soon as the class is instantiated, and not later.




git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276594 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-07-25 00:48:36 +00:00