cpp / expert
Snippet
Explicit Memory Layouts in Buffers
Low-level memory management using placement new and manual destructor calls. This technique is essential for building custom containers or handling objects in pre-allocated memory pools with strict alignment requirements.
snippet.cpp
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template <typename T>struct ManualStorage {alignas(T) std::byte buffer[sizeof(T)];bool initialized = false;template <typename... Args>void construct(Args&&... args) {new (buffer) T(std::forward<Args>(args)...);initialized = true;}void destroy() {if (initialized) {reinterpret_cast<T*>(buffer)->~T();initialized = false;}}T* get() { return reinterpret_cast<T*>(buffer); }};
Breakdown
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alignas(T) std::byte buffer[sizeof(T)];
Ensures the raw byte array is properly aligned in memory for the specific type T.
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new (buffer) T(std::forward<Args>(args)...);
Placement new: constructs an object of type T directly into the provided memory address.