C + + Programming Method 4: Function templates

function templates

Some algorithms are independent of type, so you can define a function's parameter type as a special "parameter" so that you get a "function template"

How to define a function template:
Template<typename t> return type function name (function parameter);

such as: Template<typename t> t sum (t A, T B) {return a + B;}

The function template calls, because the compiler can automatically deduce the actual parameters of the type, so formally call a function template and

There is no difference between ordinary functions, such as:

int main ()

{

int a = 3, b = 4;

cout << sum (A, b);

float f1=1.3, f2 = 9.1;

cout << sum (F1,F2);

}

Function template parameters can also be assigned default values, such as

Template<typename T0 = float,

TypeName T1,

TypeName T2 = float,

TypeName T3,

TypeName T4>

Tofunc (T1 v1,t2 v2, T3 v3, T4 v4) {...}

...

Func (n/a);

Func (' A ', ' B ', ' abc ');

C + + Programming Method 4: Function templates