Alternative for many templates in C ++

Question

I am developing a C ++ 11 application with gcc 5.4.0 2. In this application, I have the following template:

template <class T1, class T2, class T3>
class Operator
{
    T3* op1(T1* operand1, T2* operand2);
    T3* op2(T1* operand1, T2* operand2);
    T3* op3(T1* operand1, T2* operand2);
    T3* op4(T1* operand1, T2* operand2);
    //...
   T3* opn(T1* operand1, T2* operand2);
};

Inside op1, op2, ... opn, I need to do a bunch of things with arrays (presumably to have hundreds of millions of elements, potentially). Like arithmetic, comparisons, copies, etc. I choose to use templates because I would like to have constructs such as:

#pragram omp parallel for
for(int64_t i = 0; i < length; i++)
{
    r[i] = operand1[i] /*operations here*/ operand2[i]
}

For performance reasons, it makes no sense to check types in a for loop with nested ifs. And since I want to support many types, such as (int8_t, int16_t, int32_t, int64_t, float and double, and possibly unsigned), my code will be too bloated if for each operation I created a bunch for loops for every combination of types .

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.

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Answer 1

, , , , , :

common_type operator +(common_type,common_type);

template<class T1,class T2,class T3>
inline T1 operator +(T2 a, T3 b){
  return T1{common_type{a}+common_type{b}};
  }

, , , morphism , ( ) common_type. .

, - T1 operator+(common_type,common_type); ....