Hands-On System Programming with C++ by Dr. Rian Quinn

Author:Dr. Rian Quinn [Dr. Rian Quinn]
Language: eng
Format: epub
Tags: COM051070 - COMPUTERS / Programming Languages / C++, COM046070 - COMPUTERS / Operating Systems / Linux, COM051240 - COMPUTERS / Software Development and Engineering / Systems Analysis and Design
Publisher: Packt
Published: 2018-12-26T06:35:46+00:00

int main()

{

auto ptr = std::make_shared<int>();

if (ptr) {

std::cout << "before: " << ptr.get() << '
';

}

ptr.reset();

if (ptr) {

std::cout << "after: "<< ptr.get() << '
';

}

}

// > g++ -std=c++17 scratchpad.cpp; ./a.out

// before: 0x55ac226b5e80

As shown in the preceding example, when the reset() function is called, the pointer is no longer valid, as the smart pointer's internally-managed object is now pointing to nullptr, and thus, the Boolean operator returns false. Since there are no other copies of std::shared_ptr{} (that is, the managed object's count is 0), the allocated pointer is also released back to the heap.

Like std::unique_pt{}r, both the * and -> operators are provided to dereference std::shared_ptr{} (but no subscript operator since arrays are not supported):

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