tree d03f01f43580a70467fe20c1a6d80754be3a5a37
parent e9b2c2d6692f08489c28b8694cde5ad78ef06f12
author Howard Hinnant <hhinnant@apple.com> 1306523298 +0000
committer Howard Hinnant <hhinnant@apple.com> 1306523298 +0000

noexcept for <tuple>.  And in the process learned that I had done it wrong for pair's swap.  I needed to create an __is_nothrow_swappable<T>::value trait that was smart enought to answer false when __is_swappable<T>::value is false.  Otherwise one gets compile-time errors when using pair or tuple of non-swappable types, even if you never try to swap the pair or tuple.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@132204 91177308-0d34-0410-b5e6-96231b3b80d8