std::scoped_lock<MutexTypes...>::scoped_lock
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explicit scoped_lock( MutexTypes&... m );
(1)
(since C++17)
scoped_lock( std::adopt_lock_t, MutexTypes&... m );
(2)
(since C++17)
scoped_lock( const scoped_lock& ) = delete;
(3)
(since C++17)
Acquires ownership of the given mutexes m.
1) If sizeof...(MutexTypes) == 0, does nothing. Otherwise, if sizeof...(MutexTypes) == 1, effectively calls m.lock(). Otherwise, effectively calls std::lock (m...).
2) Acquires ownership of the mutexes m... without attempting to lock any of them. The behavior is undefined unless the current thread holds a non-shared lock (i.e., a lock acquired by
lock, try_lock, try_lock_for, or try_lock_until) on each object in m....3) Copy constructor is deleted.
The behavior is undefined if m is destroyed before the scoped_lock object is.
[edit] Parameters
m
-
mutexes to acquire ownership of
[edit] Exceptions
1) Throws any exceptions thrown by m.lock().
2) Throws nothing.
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| P0739R0 | C++17 | adopt_lock_t parameter was last, impeding class template argument deduction
|
moved to first |