The correct answer is: A. may, as long as each version has the same arguments
A function template is a function that can be instantiated with different types. For example, the following function template can be instantiated with any type T:
template <typename T>
T add(T a, T b) {
return a + b;
}
We can instantiate this function template with integers, floats, or any other type. For example, the following code calls the function template with integers:
int a = 1;
int b = 2;
int c = add(a, b);
The code above will assign the value 3 to the variable c.
We can also overload function templates. Overloading a function template means creating multiple versions of the function template with different signatures. For example, the following code overloads the add function template:
“`template
T add(T a, T b) {
return a + b;
}
template
T add(T a, U b) {
return a + b;
}
“`
The first version of the add function template takes two arguments of the same type, and the second version of the add function template takes two arguments of different types.
We can call the overloaded function templates with different types. For example, the following code calls the first version of the add function template:
int a = 1;
int b = 2;
int c = add(a, b);
The code above will assign the value 3 to the variable c.
The following code calls the second version of the add function template:
int a = 1;
float b = 2.0;
float c = add(a, b);
The code above will assign the value 3.0 to the variable c.
We can overload function templates as long as each version of the function template has a different signature. In other words, the number and types of the arguments must be different for each version of the function template.