175. Template

Question.3

A developer separates a template into header and source files:

buffer.h:

template<typename T>
class Buffer {
public:
   void push(T val);  // Declaration
};

buffer.cpp:

template<typename T>
void Buffer<T>::push(T val) { /* impl */ }

main.cpp:

Buffer<int> buf;
buf.push(42);

Will this compile and link?

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Yes -- normal header/source separation works
Linker error -- the compiler cannot instantiate Buffer<int>::push in main.cpp because the implementation is hidden in buffer.cpp; templates must be fully defined in headers
Compiles but crashes at runtime
Works only with explicit template instantiation in buffer.cpp

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