Delivery of a C + + sort class Member

The sort method is provided in the C + + template, which generally has two methods: passing a function and passing an object.

The first method: function

bool Compare (conststringconststring &strright) {  return strleft<strright;} int main () {vector<string> vtstrtest;      Vtstrtest.push_back (...);　　Std::sort (Vtstrtest.begin (), vtstrtest.end (), compare);  return0;}

Note: The Compare function here is a global function, not a member function.

The second method of

The code is as follows:

#include <stdio.h>#include<stdlib.h>#include<string.h>#include<iostream>#include<vector>#include<algorithm>using namespacestd;classsorttest{ Public: Sorttest () {}voidrun () {vtsort (); }Private:    voidVtsort (); structSortdesc {BOOL operator() (Const string&left,Const string&Right ) {            returnLeft >Right ; }    };};voidsorttest::vtsort () {vector<string>vttemp; Vttemp.push_back ("ABCEF"); Vttemp.push_back ("12348"); Vttemp.push_back ("$#@!");    Std::sort (Vttemp.begin (), Vttemp.end (), Sortdesc ());  for(inti =0; I<vttemp.size (); ++i) {cout<<vtTemp[i]<<Endl; }}intMain () {sorttest test;    Test.run (); return 0;}

The running result of the above code:

Abcef
12348
$#@!

Note that it is not possible to sort a member function pointer in a class, but rather to pass an object. Because the C + + template gets no member function pointers to the class, the type member function pointers all imply the this pointer.

Delivery of a C + + sort class Member