Common Pitfalls and Best Practices
When using move semantics, be aware of common pitfalls that can lead to bugs or undefined behavior. Understanding these issues will help you write safer, more robust C++ code.
After moving from an object, its state is unspecified. Accessing resources from a moved-from object can cause crashes or logic errors.
If you forget to null out pointers in the source object after moving, both objects may try to delete the same resource, leading to undefined behavior.
Move constructors and assignment operators cannot modify const objects, so moving from const will fall back to copying.
Always leave moved-from objects in a valid state (e.g., set pointers to nullptr) and avoid using them unless reassigned. This practice reduces the risk of undefined behavior and keeps your programs reliable.
When to Use Move vs Copy
Choosing between move and copy depends on whether you need to preserve the original object. Move when you can transfer ownership and don't need the source; copy when both objects must remain valid and independent.
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When using move semantics, be aware of common pitfalls that can lead to bugs or undefined behavior. Understanding these issues will help you write safer, more robust C++ code.
After moving from an object, its state is unspecified. Accessing resources from a moved-from object can cause crashes or logic errors.
If you forget to null out pointers in the source object after moving, both objects may try to delete the same resource, leading to undefined behavior.
Move constructors and assignment operators cannot modify const objects, so moving from const will fall back to copying.
Always leave moved-from objects in a valid state (e.g., set pointers to nullptr) and avoid using them unless reassigned. This practice reduces the risk of undefined behavior and keeps your programs reliable.
When to Use Move vs Copy
Choosing between move and copy depends on whether you need to preserve the original object. Move when you can transfer ownership and don't need the source; copy when both objects must remain valid and independent.
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