C++ Tutorial/set multiset/set swap — различия между версиями
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Версия 14:21, 25 мая 2010
swap one set with another set
#include <iostream>
#include <set>
using namespace std;
typedef set<int> SET_INT;
int main(void){
SET_INT s1;
SET_INT s2;
SET_INT::iterator i;
s1.insert(5);
s1.insert(10);
s1.insert(15);
s2.insert(2);
s2.insert(4);
swap(s1,s2);
for (i=s1.begin();i!=s1.end();i++)
cout << "s1 has " << *i << " in its set." << endl;
for (i=s2.begin();i!=s2.end();i++)
cout << "s2 has " << *i << " in its set." << endl;
s1.swap(s2);
for (i=s1.begin();i!=s1.end();i++)
cout << "s1 has " << *i << " in its set." << endl;
for (i=s2.begin();i!=s2.end();i++)
cout << "s2 has " << *i << " in its set." << endl;
}Swap two sets and display its content
#include <iostream>
#include <set>
using namespace std;
typedef set<int> SET_INT;
int main(void)
{
SET_INT s1;
SET_INT s2;
SET_INT::iterator i;
s1.insert(5);
s1.insert(10);
s1.insert(15);
s2.insert(2);
s2.insert(4);
cout << "swap(s1,s2)" << endl;
swap(s1,s2);
for (i=s1.begin();i!=s1.end();i++)
cout << "s1 has " << *i << " in its set." << endl;
for (i=s2.begin();i!=s2.end();i++)
cout << "s2 has " << *i << " in its set." << endl;
s1.swap(s2);
for (i=s1.begin();i!=s1.end();i++)
cout << "s1 has " << *i << " in its set." << endl;
for (i=s2.begin();i!=s2.end();i++)
cout << "s2 has " << *i << " in its set." << endl;
}Swap two sets using the swap() function
#include <set>
#include <iostream>
#include <string>
using namespace std;
template <class T>
void print(T& c){
for( typename T::iterator i = c.begin(); i != c.end(); i++ ){
std::cout << *i << endl;
}
}
int main(){
set<string> first;
first.insert("A");
first.insert("B");
first.insert("C");
cout << first.size() << endl;
set<string> second (first); // Copy constructor
second.insert("I");
second.insert("S");
swap(first, second);
set<string> third = first;
print(first);
print(second);
print(third);
}