forked from OSchip/llvm-project
74cba6427a
There are two main fixes in this patch. First the constructor SFINAE was changed so that it's evaluated in two stages where the first stage evaluates the "safe" SFINAE conditions and the second evaluates the "dangerous" ones. The key is that the second stage is lazily evaluated only if the first stage passes. This helps fix PR23256 (https://llvm.org/bugs/show_bug.cgi?id=23256). The second fix is for PR22806 and LWG issue 2549. This fix applies the suggested resolution to the LWG issue in order to prevent the construction of dangling references. The SFINAE for this check is contained within the _PreferTupleLikeConstructor alias template. The tuple-like constructors are disabled whenever that trait returns false. (https://llvm.org/bugs/show_bug.cgi?id=22806) (http://cplusplus.github.io/LWG/lwg-active.html#2549) llvm-svn: 266461 |
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