[英]Reusable std::shared_ptr
是否可以使std::shared_ptr
不刪除 object,而是將其移至列表中?
#include <memory>
#include <list>
struct QObject { double socialDistance; };
int main()
{
std::list<QObject *> free_objects;
std::list<QObject *> used_objects;
QObject* p_object = new QObject{10};
free_objects.push_back(p_object);
{
std::shared_ptr<QObject> p(p_object);
}
//At this point p_object is moved from free_objects to used_objects,
//so I reuse the object later.
return 0;
}
如果是,是否可以不僅重用對象,還重用控制塊以避免 memory 重新分配?
是否可以使 std::shared_ptr 不刪除 object,而是將其移至列表中?
您可以為此使用自定義刪除器:
std::shared_ptr<QObject> p(p_object, [&](QObject* p){
used_objects.push_back(p);
auto it = std::find(free_objects.begin(), free_objects.end(), p);
if (it != free_objects.end()) free_objects.erase(it);
});
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