C + + function templates 1

1 Definition:

function templates only apply to cases where the number of parameters is the same but the type is different and the function body is the same

2 This example does not use a template case

#include <iostream>using namespacestd;voidSwap (int&a,int&b) {    intt =A; A=b; b=t;}voidSwap (Double&a,Double&b) {    Doublet =A; A=b; b=t;}intmain1 () {//long a = 2; //long B = 3; //Swap (A, b);    intA =2; intb =3; Swap (A, b);//but not a double. Introducing templates for general purposecout << a << b <<Endl; Cin.Get(); return 1;}

3 after using the template

1#include <iostream>2#include <string>3 using namespacestd;4 5 /*6 function templates apply only to the same number of parameters but differ in type and function7 in the same situation, otherwise it may not8 */9Template <typename t>//Here typename can be changed to classTen voidSwap (t &a, T &b) One { AT t =A; -A =b; -b =T; the } -  - intmain2 () - { +     intA =Ten; -     intb = -; + Swap (A, b); Acout << a << b <<Endl; at  -     Longc =Ten; -     LongD = -; - Swap (c, D); -cout << C << D <<Endl; -  in     stringSA ="Hello"; -     stringSB ="Zzong"; to Swap (SA, SB); +cout << sa << SB <<Endl; -      theCin.Get(); *     return 1; $}

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C + + function templates 1