Methoden eines Unique Pointers
Da std::unique_ptr
eine Klassenvorlage ist, bietet es verschiedene Methoden, um sich selbst sicher zu verwalten.
main.cpp
12345678910111213141516171819202122232425262728293031323334353637383940414243#include <iostream> #include <memory> struct Sample { Sample(int v) : value(v) {} int value; void GetValue() { std::cout << "Value: " << value << std::endl; } }; int main() { // Creating a `unique_ptr` std::unique_ptr<Sample> p_first = std::make_unique<Sample>(10); // Using `get()` to retrieve the raw pointer Sample* p_raw = p_first.get(); std::cout << "Raw pointer value: " << p_raw->value << std::endl; // Using `release()` to transfer ownership Sample* p_released = p_first.release(); if (!p_first) std::cout << "p_first is now empty after release.\n"; // Manually delete the released pointer to avoid memory leak delete p_released; // Resetting the `unique_ptr` p_first.reset(new Sample(20)); p_first->GetValue(); // Using `swap()` with another `unique_ptr` std::unique_ptr<Sample> p_second = std::make_unique<Sample>(30); p_first.swap(p_second); p_first->GetValue(); // Now `p_first` owns `p_second` object // Dereferencing the pointer std::cout << "Dereferencing p_first: " << (*p_first).value << std::endl; // Accessing members using `->` operator p_first->GetValue(); }
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Abschnitt 2. Kapitel 5
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Methoden eines Unique Pointers
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Da std::unique_ptr
eine Klassenvorlage ist, bietet es verschiedene Methoden, um sich selbst sicher zu verwalten.
main.cpp
12345678910111213141516171819202122232425262728293031323334353637383940414243#include <iostream> #include <memory> struct Sample { Sample(int v) : value(v) {} int value; void GetValue() { std::cout << "Value: " << value << std::endl; } }; int main() { // Creating a `unique_ptr` std::unique_ptr<Sample> p_first = std::make_unique<Sample>(10); // Using `get()` to retrieve the raw pointer Sample* p_raw = p_first.get(); std::cout << "Raw pointer value: " << p_raw->value << std::endl; // Using `release()` to transfer ownership Sample* p_released = p_first.release(); if (!p_first) std::cout << "p_first is now empty after release.\n"; // Manually delete the released pointer to avoid memory leak delete p_released; // Resetting the `unique_ptr` p_first.reset(new Sample(20)); p_first->GetValue(); // Using `swap()` with another `unique_ptr` std::unique_ptr<Sample> p_second = std::make_unique<Sample>(30); p_first.swap(p_second); p_first->GetValue(); // Now `p_first` owns `p_second` object // Dereferencing the pointer std::cout << "Dereferencing p_first: " << (*p_first).value << std::endl; // Accessing members using `->` operator p_first->GetValue(); }
War alles klar?
Danke für Ihr Feedback!
Abschnitt 2. Kapitel 5