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This commit is contained in:
zhangxing
2023-03-30 00:15:11 +08:00
committed by light-city
parent 1f86192576
commit 3c8a3f259b
641 changed files with 10349 additions and 9523 deletions
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19
design_pattern/singleton/lock_singleton.cpp
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@@ -8,18 +8,19 @@ using namespace std;
class singleton {
private:
singleton() {}
static singleton *p;
static mutex lock_;
singleton() {}
static singleton *p;
static mutex lock_;
public:
static singleton *instance();
static singleton *instance();
};
singleton *singleton::p = nullptr;
singleton* singleton::instance() {
lock_guard<mutex> guard(lock_);
if (p == nullptr)
p = new singleton();
return p;
singleton *singleton::instance() {
lock_guard<mutex> guard(lock_);
if (p == nullptr)
p = new singleton();
return p;
}