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Fix build breakage from lock_guard error (#6161)
Summary: This change fixes a source issue that caused compile time error which breaks build for many fbcode services in that setup. The size() member function of channel is a const member, so member variables accessed within it are implicitly const as well. This caused error when clang fails to resolve to a constructor that takes std::mutex because the suitable constructor got rejected due to loss of constness for its argument. The fix is to add mutable modifier to the lock_ member of channel. Pull Request resolved: #6161 Differential Revision: D18967685 Pulled By: maysamyabandeh fbshipit-source-id: 698b6a5153c3c92eeacb842c467aa28cc350d432
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