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Showing content from https://timsong-cpp.github.io/cppwp/n4659/util.smartptr.weak.obs below:

[util.smartptr.weak.obs]

23 General utilities library [utilities] 23.11 Smart pointers [smartptr] 23.11.2 Shared-ownership pointers [util.smartptr] 23.11.2.3 Class template weak_­ptr [util.smartptr.weak] 23.11.2.3.5 weak_­ptr observers [util.smartptr.weak.obs]

long use_count() const noexcept;

Returns: 0 if *this is empty; otherwise, the number of shared_­ptr instances that share ownership with *this.

bool expired() const noexcept;

Returns: use_­count() == 0.

shared_ptr<T> lock() const noexcept;

Returns: expired() ? shared_­ptr<T>() : shared_­ptr<T>(*this), executed atomically.

template<class U> bool owner_before(const shared_ptr<U>& b) const; template<class U> bool owner_before(const weak_ptr<U>& b) const;

Returns: An unspecified value such that


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