Things to note when allocating and destroying C++ function memory in embedded systems

Notes on memory allocation and destruction in embedded systems: Allocate memory carefully and use the new/delete operator. Dynamically allocated memory is released in the destructor when the function exits.

Notes on C function memory allocation and destruction in embedded systems

Memory allocation:

• Embedded systems Typically has limited memory, so care needs to be taken when allocating memory.
• Use the new operator to allocate memory, and then use the delete operator to free the memory.

Memory destruction:

• Ensure that memory is released when it is no longer needed to prevent memory leaks.
• When the function exits, dynamically allocated memory should be released in the destructor.

Practical case:

class MyClass {
public:
  MyClass() {
    // 分配内存
    data = new int[10];
  }

  ~MyClass() {
    // 释放内存
    delete[] data;
  }

private:
  int* data;
};

int main() {
  {
    // 函数作用域内创建对象
    MyClass obj;
  } // obj 被销毁时，内存被释放

  return 0;
}

Note:

• Do not release memory when the function returns: This may result in undefined the behavior of.
• Don't leak memory: Unfreed memory will be wasted and may cause system instability.
• Consider using memory pools: Memory pools can improve memory reuse and reduce fragmentation.
• Use the RAII convention: The Resource Acquisition Is Initialization (RAII) convention ensures that resources are automatically released after the object's life cycle ends.

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