Difference between revisions of "cpp/atomic/ATOMIC FLAG INIT"
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| − | Defines the expression which can be used to initialize {{lc|std::atomic_flag}} to clear (false) state with the statement {{c|std::atomic_flag v = ATOMIC_FLAG_INIT;}}. It is unspecified if it can be used with other initialization contexts. If the flag has static storage duration, this initialization is static. | + | Defines the expression which can be used to initialize {{lc|std::atomic_flag}} to clear (false) state with the statement {{c|std::atomic_flag v {{=}} ATOMIC_FLAG_INIT;}}. It is unspecified if it can be used with other initialization contexts. If the flag has static storage duration, this initialization is static. |
===Example=== | ===Example=== | ||
Revision as of 12:40, 9 November 2013
| Defined in header <atomic>
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| #define ATOMIC_FLAG_INIT /* implementation-defined */ |
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Defines the expression which can be used to initialize std::atomic_flag to clear (false) state with the statement std::atomic_flag v = ATOMIC_FLAG_INIT;. It is unspecified if it can be used with other initialization contexts. If the flag has static storage duration, this initialization is static.
Example
Run this code
#include <atomic> std::atomic_flag static_flag = ATOMIC_FLAG_INIT; // static initialization, // guaranteed to be available during dynamic initialization of static objects. int main() { std::atomic_flag automatic_flag = ATOMIC_FLAG_INIT; // guaranteed to work // std::atomic_flag another_flag(ATOMIC_FLAG_INIT); // unspecified }
See also
| (C++11) |
the lock-free boolean atomic type (class) |
