в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

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2010-05-25T10:27:14Z

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==Erase a found pair from map==

<source lang="cpp">

#include <iostream>
#include <map>
#include <string>
using namespace std;
int main( ) {
map<string, string> strMap;
strMap["Monday"] = "1";
strMap["Tuesday"] = "2";
strMap["Wednesday"] = "3";
strMap["Thursday"] = "4";
strMap["Friday"] = "5";
strMap["Saturday"] = "6";
strMap.insert(pair<string, string>("Sunday", "7"));
strMap.erase(strMap.find("Tuesday"));
for (map<string, string>::iterator p = strMap.begin( );
p != strMap.end( ); ++p ) {
cout << "English: " << p->first<< ", #: " << p->second << endl;
}
cout << endl;
}
/*
English: Friday, #: 5
English: Monday, #: 1
English: Saturday, #: 6
English: Sunday, #: 7
English: Thursday, #: 4
English: Wednesday, #: 3

*/

</source>

==map erase==

<source lang="cpp">
#include <map>
#include <iostream>
using namespace std;
class Data
{
public:
Data(int val = 0) { mVal = val; }
int getVal() const { return mVal; }
void setVal(int val) {mVal = val; }
protected:
int mVal;
};
int main(int argc, char** argv)
{
map<int, Data> dataMap;
dataMap[1] = Data(4);
cout << "There are " << dataMap.count(1) << " elements with key 1\n";
dataMap.erase(1);
cout << "There are " << dataMap.count(1) << " elements with key 1\n";
return (0);
}

</source>

==Remove an entry from a map==

<source lang="cpp">

/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <iostream>
#include <map>
#include <string>
using namespace std;
int main()
{
/* create map / associative array
* - keys are strings
* - values are floats
*/
typedef map<string,float> StringFloatMap;
StringFloatMap stocks; // create empty container
// insert some elements
stocks["BASF"] = 369.50;
stocks["VW"] = 413.50;
stocks["Daimler"] = 819.00;
stocks["BMW"] = 834.00;
stocks["Siemens"] = 842.20;
// print all elements
StringFloatMap::iterator pos;
for (pos = stocks.begin(); pos != stocks.end(); ++pos) {
cout << "stock: " << pos->first << "\t"
<< "price: " << pos->second << endl;
}
cout << endl;

stocks.erase("VW");
// print all elements
for (pos = stocks.begin(); pos != stocks.end(); ++pos) {
cout << "stock: " << pos->first << "\t"
<< "price: " << pos->second << endl;
}
cout << endl;
}
/*
stock: BASF price: 369.5
stock: BMW price: 834
stock: Daimler price: 819
stock: Siemens price: 842.2
stock: VW price: 413.5
stock: BASF price: 369.5
stock: BMW price: 834
stock: Daimler price: 819
stock: Siemens price: 842.2

*/

</source>

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C++/Map Multimap/map erase - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...