Bind () adapter (Adapter)--Call global function and member function

Calling global functions

To invoke a global function program instance:

#include <iostream>#include <algorithm>#include <functional>#include <locale>#include <string>using namespace STD;using namespace STD::p laceholders;CharMy_toupper (Charc) {locale loc;return STD::use_facet<STD::ctype<Char> > (loc).ToUpper(c);}intMain () {stringS"Internationalization");stringSub"Nation");string:: Iterator Pos; pos = Search (S.begin (), S.end (), Sub.begin (), Sub.end (), Bind (equal_to<Char> (), Bind (My_toupper, _1), bind (My_toupper, _2));if(pos! = S.end ()) {cout<<"\""<< Sub <<"\" is part of\ ""<< s <<"\""<< Endl; } System ("Pause");}

运行结果："Nation"isof"Internationalization"请按任意键继续. . .

Program Analysis:
This example uses the search () algorithm to verify that the sub is a substring of s and is not case-insensitive. With the following:

bind(equal_to<char>(),bind(my_toupper, _1),bind(my_toupper, _2))

is to create a function object that is equivalent to calling:

my_toupper(arg1) == my_toupper(arg2);

Attention:
Bind () internally copies the arguments that are passed in.
To change this behavior, let the function object use a reference (reference) to point to the argument being passed in, either with ref () or CREF ():
For example:

void incr(int& i){    ++i;}int i =0;bind(incr, i)();      //仅仅一个拷贝ref//引用传递

Calling member functions

The following procedure demonstrates how bind () is used to invoke member functions

#include <iostream>#include <functional>#include <algorithm>#include <vector>#include <string>using namespace STD;using namespace STD::p laceholders;classperson{Private:stringname_; Public: Person (Const string& N): Name_ (n) {}voidPrint ()Const{cout<< name_ << Endl; }voidPrint2 (Const string& prefix)Const{cout<< prefix << name_ << Endl; }};intMain () { vector<Person>coll = {person ("CSU"), Person ("CSRU"), Person ("Csiu")    };//Each person object calls the member functionFor_each (Coll.begin (), Coll.end (), Bind (&person::p rint, _1));cout<< Endl; For_each (Coll.begin (), Coll.end (), Bind (&person::p rint2, _1,"Person:"));cout<< Endl; Bind (&person::p rint2, _1,"This is:") (Person ("Railway Academy")); System"Pause");}

/*运行结果csucsrucsiuPerson: csuPerson: csruPerson: csiuThis is : 铁道学院请按任意键继续. . .*/

Program Analysis:
A function object is defined in the program that bind(&Person::print, _1) calls Param1.print () for the incoming person,
That is, because the first argument is a member function, the next parameter defines the object to invoke the member function.
Any other arguments will be passed to the member function. This means that:

bind"Person: ")

Defines a function object that is invoked on the incoming person param1.print2("Person：") .

Lambda implementations call global functions and class member functions

//Global function#include <iostream>#include <algorithm>#include <locale>#include <string>using namespace STD;CharMy_toupper (Charc) {STD:: Locale loc;return STD::use_facet<STD::ctype<Char>> (Loc).ToUpper(c);}intMain () {stringS"Internationalizition");stringSub"Nation");string:: Iterator Pos; pos = Search (S.begin (), S.end (), Sub.begin (), Sub.end (), [] (CharC1,CharC2) {returnMy_toupper (C1) = = My_toupper (c2); }    );if(pos! = S.end ()) {cout<< Sub <<" is part of"<< s << Endl; } System ("Pause");}/*nation is part of internationalizition please press any key to continue ... * /

//class member function#include <iostream>#include <functional>#include <algorithm>#include <vector>#include <string>using namespace STD;using namespace STD::p laceholders;classperson{Private:stringname_; Public: Person (Const string& N): Name_ (n) {}voidPrint ()Const{cout<< name_ << Endl; }voidPrint2 (Const string& str)Const{cout<< str << name_ << Endl; }};intMain () { vector<Person>coll = {person ("CSU"), Person ("CSRU"), Person ("Csiu")    }; For_each (Coll.begin (), Coll.end (), [] (Constperson& p) {p.print (); });cout<< Endl; For_each (Coll.begin (), Coll.end (), [] (Constperson& p) {P.print2 ("Person:");    }); System"Pause");}/*csucsrucsiuperson:csuperson:csruperson:csiu Please press any key to continue ... * *

Bind () adapter (Adapter)--Call global function and member function