what's the difference between

template<typename T>
auto add1(const T& a, const T& b)
{ return a + b; }

and

template<typename T>
auto add2(T a, const T& b)
{ return a += b; }

?

Follow

<type_traits>

static_assert(not std::is_same_v<
decltype(add1( short{1}, short{2} )),
decltype(add2( short{1}, short{2} ))
>);

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