C++ 概念： Lockable
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Lockable的概念延伸BasicLockable的概念，包括试图锁定.原文：
The
Lockable concept extends the BasicLockable concept to include attempted locking.[编辑] 要求
类型
LLockable，它必须满足上述条件，以及以下原文：
For type
L to be Lockable, it must meet the above condition as well as the following:| Expression | Effects | Return value |
|---|---|---|
| m.try_lock() | Attempts to acquire the lock for the current execution agent without blocking. If an exception is thrown, no lock is obtained. | true if the lock was acquired, false otherwise |
