
If we want to add support for making std::cin and std::cout optional, it is impractical to have all of the mbstate_t objects in one array. This would mean that if std::cin and std::cout are omitted, the state_types array is only used partially. Solve this by using separate global variables. These are placed right next to the iostream object and the buffer, meaning we can easily #ifdef them away. Differential Revision: http://reviews.llvm.org/D8359 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@233274 91177308-0d34-0410-b5e6-96231b3b80d8
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