C ++中的模板参数

Question

Suppose I have arbitrary template method, which could receive parameters by value and by const reference (obviously, for trivial types and for objects accordingly).

How is this situation handled when writing template function prototypes?

I could make something like:

template <typename T> void Foo(T value) {
   // Do something.
}

template <typename T> void Foo(const T& value) {
   // Do something, yeah.
}

// Specialization for first prototype. 
template <> void Foo<int>(int value) { }

// Specialization for second prototype. 
template <> void Foo<Object>(const Object& value) { }

But this approach is only okay for trivial functions, that act purely as a wrapper for some other calls.

If the function (non-templated version) has a lot of code inside it, this means I would have to copy the code twice.

Can I make something smarter here?

Answer 1

只需使用const引用ALWAYS，因为将原始类型作为const引用传递没有太多开销。

Answer 2

仅为const引用编写模板代码，并依赖编译器来优化引用。