C++ Tutorial/list/list — различия между версиями
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Текущая версия на 10:29, 25 мая 2010
Содержание
- 1 Add elements in a multiset to a list
- 2 Add elements in a set to a list
- 3 Constructing One Container from Another
- 4 Four constructors of list
- 5 Pass list to a function
- 6 Store class objects in a list
- 7 Use generic list to create a list of chars
- 8 Use generic list to create list of strings
- 9 Uses ostream_iterator and copy algorithm to output list elements
- 10 Use std::copy to print all elements in a list
Add elements in a multiset to a list
#include <iostream>
#include <cassert>
#include <list>
#include <string>
#include <set>
using namespace std;
int main()
{
string s("There is no distinctly native American criminal class");
list<char> list1(s.begin(), s.end());
// Put the characters in list1 into multiset1:
multiset<char> multiset1;
list<char>::iterator i;
for (i = list1.begin(); i != list1.end(); ++i)
multiset1.insert(*i);
// Put the characters in multiset1 into list2:
list<char> list2;
multiset<char>::iterator k;
for (k = multiset1.begin(); k != multiset1.end(); ++k)
list2.push_back(*k);
for (i = list2.begin(); i != list2.end(); ++i)
cout << *i;
return 0;
}ATaaaaccccdeeeehiiiiiiilllmmnnnnnorrrsssstttvy"
Add elements in a set to a list
#include <iostream>
#include <cassert>
#include <list>
#include <string>
#include <set>
using namespace std;
int main()
{
string s("There is no distinctly native American criminal class");
list<char> list1(s.begin(), s.end());
// Put the characters in list1 into set1:
set<char> set1;
list<char>::iterator i;
for (i = list1.begin(); i != list1.end(); ++i)
set1.insert(*i);
set<char>::iterator j;
list<char> list2;
set<char>::iterator k;
for (k = set1.begin(); k != set1.end(); ++k)
list2.push_back(*k);
for (i = list2.begin(); i != list2.end(); ++i)
cout << *i;
return 0;
}ATacdehilmnorstvy"
Constructing One Container from Another
#include <iomanip>
#include <iostream>
#include <list>
#include <vector>
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( )
{
const int data[] = { 1, 1, 2, 3, 5 };
list<int> original( data,data + sizeof( data ) / sizeof( data[0] ) );
// make a vector from a list
vector<int> vector_copy( original.begin(), original.end() );
// make a list from a list
list<int> list_copy( original );
// make a list of floats from a list of ints
list<float> list_float( original.begin(), original.end() );
// show results
print( original);
print( vector_copy);
print( list_copy);
cout << fixed << setprecision( 1 );
print( list_float );
}Four constructors of list
#include <list>
#include <iostream>
#include <string>
using namespace std;
typedef list<string> LISTSTR;
int main(void)
{
LISTSTR::iterator i;
LISTSTR test; // default constructor
test.insert(test.end(), "one");
test.insert(test.end(), "two");
LISTSTR test2(test); // construct from another list
LISTSTR test3(3, "three"); // construct with three elements
// containing the value "three"
LISTSTR test4(++test3.begin(),test3.end()); // create from part of test3
for (i = test.begin(); i != test.end(); ++i)
cout << *i << " ";
cout << endl;
for (i = test2.begin(); i != test2.end(); ++i)
cout << *i << " ";
cout << endl;
for (i = test3.begin(); i != test3.end(); ++i)
cout << *i << " ";
cout << endl;
for (i = test4.begin(); i != test4.end(); ++i)
cout << *i << " ";
cout << endl;
}Pass list to a function
#include <iostream>
using std::cout;
using std::endl;
#include <list> // list class-template definition
#include <algorithm> // copy algorithm
#include <iterator> // ostream_iterator
template < typename T > void printList( const std::list< T > &listRef );
int main()
{
int array[ 4 ] = { 2, 6, 4, 8 };
std::list< int > values; // create list of ints
std::list< int > otherValues; // create list of ints
// insert items in values
values.push_front( 1 );
values.push_front( 2 );
values.push_back( 4 );
values.push_back( 3 );
cout << "values contains: ";
printList( values );
cout << endl;
return 0;
}
template < typename T > void printList( const std::list< T > &listRef )
{
std::ostream_iterator< T > output( cout, " " );
std::copy( listRef.begin(), listRef.end(), output );
}values contains: 2 1 4 3
Store class objects in a list
#include <iostream>
#include <list>
#include <cstring>
using namespace std;
class MyClass {
int a, b;
int sum;
public:
MyClass() {
a = b = 0;
}
MyClass(int i, int j) {
a = i;
b = j;
sum = a + b;
}
int getsum() {
return sum;
}
friend bool operator<(const MyClass &o1,const MyClass &o2);
friend bool operator>(const MyClass &o1,const MyClass &o2);
friend bool operator==(const MyClass &o1,const MyClass &o2);
friend bool operator!=(const MyClass &o1,const MyClass &o2);
};
bool operator<(const MyClass &o1, const MyClass &o2)
{
return o1.sum < o2.sum;
}
bool operator>(const MyClass &o1, const MyClass &o2)
{
return o1.sum > o2.sum;
}
bool operator==(const MyClass &o1, const MyClass &o2)
{
return o1.sum == o2.sum;
}
bool operator!=(const MyClass &o1, const MyClass &o2)
{
return o1.sum != o2.sum;
}
int main()
{
list<MyClass> lst1;
for(int i=0; i<10; i++) lst1.push_back(MyClass(i, i));
cout << "First list: ";
list<MyClass>::iterator p = lst1.begin();
while(p != lst1.end()) {
cout << p->getsum() << " ";
p++;
}
cout << endl;
// create a second list
list<MyClass> lst2;
for(int i=0; i<10; i++) lst2.push_back(MyClass(i*2, i*3));
cout << "Second list: ";
p = lst2.begin();
while(p != lst2.end()) {
cout << p->getsum() << " ";
p++;
}
cout << endl;
lst1.merge(lst2);
cout << "Merged list: ";
p = lst1.begin();
while(p != lst1.end()) {
cout << p->getsum() << " ";
p++;
}
return 0;
}First list: 0 2 4 6 8 10 12 14 16 18 Second list: 0 5 10 15 20 25 30 35 40 45 Merged list: 0 0 2 4 5 6 8 10 10 12 14 15 16 18 20 25 30 35 40 45
Use generic list to create a list of chars
#include <iostream>
#include <cassert>
#include <list>
#include <algorithm> // For reverse
using namespace std;
int main()
{
char x[5] = {"a", "b", "c", "d", "e"};
list<char> list1(&x[0], &x[5]);
reverse(list1.begin(), list1.end());
list<char>::iterator i;
cout.precision(10);
for (i = list1.begin(); i != list1.end(); ++i)
cout << *i << endl;
cout << endl;
return 0;
}e d c b a
Use generic list to create list of strings
#include <iostream>
#include <cassert>
#include <list>
#include <algorithm> // For reverse
using namespace std;
int main()
{
string x[5] = {"asdf", "1234", "2345", "6789", "0000"};
list<string> list1(&x[0], &x[5]);
reverse(list1.begin(), list1.end());
list<string>::iterator i;
cout.precision(10);
for (i = list1.begin(); i != list1.end(); ++i)
cout << *i << endl;
cout << endl;
return 0;
}0000 6789 2345 1234 asdf
Uses ostream_iterator and copy algorithm to output list elements
#include <iostream>
using std::cout;
using std::endl;
#include <list> // list class-template definition
#include <algorithm> // copy algorithm
#include <iterator> // ostream_iterator
template < typename T > void printList( const std::list< T > &listRef );
int main()
{
int array[ 4 ] = { 2, 6, 4, 8 };
std::list< int > values; // create list of ints
std::list< int > otherValues; // create list of ints
// insert items in values
values.push_front( 1 );
values.push_front( 2 );
values.push_back( 4 );
values.push_back( 3 );
cout << "values contains: ";
printList( values );
cout << endl;
return 0;
}
template < typename T > void printList( const std::list< T > &listRef )
{
std::ostream_iterator< T > output( cout, " " );
std::copy( listRef.begin(), listRef.end(), output );
}values contains: 2 1 4 3
Use std::copy to print all elements in a list
#include <iostream>
using std::cout;
using std::endl;
#include <list> // list class-template definition
#include <algorithm> // copy algorithm
#include <iterator> // ostream_iterator
int main()
{
int array[ 4 ] = { 2, 6, 4, 8 };
std::list< int > values; // create list of ints
std::list< int > otherValues; // create list of ints
// insert items in values
values.push_front( 1 );
values.push_front( 2 );
values.push_back( 4 );
values.push_back( 3 );
cout << "values contains: ";
std::ostream_iterator< int > output( cout, " " );
std::copy( values.begin(), values.end(), output );
cout << endl;
return 0;
}values contains: 2 1 4 3
