cpp / expert
Snippet
Perfect Forwarding with Variadic Templates and std::forward
Implements 'Perfect Forwarding' to pass arguments to a constructor exactly as they were received (preserving lvalue/rvalue status). This avoids unnecessary copies and enables move semantics for complex objects.
snippet.cpp
cpp
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template <typename T, typename... Args>std::unique_ptr<T> create(Args&&... args) {return std::unique_ptr<T>(new T(std::forward<Args>(args)...));}struct Node {Node(int id, std::string name) : id(id), name(std::move(name)) {}int id; std::string name;};auto n = create<Node>(1, "Entity");
Breakdown
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typename... Args
Defines a template parameter pack for an arbitrary number of arguments.
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Args&&... args
Universal references (forwarding references) that can bind to any type of argument.
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std::forward<Args>(args)...
Expands the pack while maintaining the value category of each argument.