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Eric Fiselier e7f8cd476d [libc++] Shrink variant's index type when possible ... Summary: Currently `std::variant` always uses an unsigned int to store the variant index. However this isn't nessesary and causes `std::variant` to be larger than it needs to be in most cases. This patch changes the index type to be `unsigned char` when possible, and `unsigned short` or `unsigned int` otherwise, depending on the size (Although it's questionable if it's even possible to create a variant with 65535 elements. Unfortunately this change is an ABI break, and as such is only enabled in ABI v2. Reviewers: mpark Reviewed By: mpark Subscribers: cfe-commits Differential Revision: https://reviews.llvm.org/D40210 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@318621 91177308-0d34-0410-b5e6-96231b3b80d8		8 years ago
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variant.helper	Mark the recent variant test as UNSUPPORTED for C++ before 17	9 years ago
variant_size.pass.cpp	[libc++] Shrink variant's index type when possible	8 years ago