C++/List/list insert
Содержание
- 1 Combine insert and begin to add element to the start of a list
- 2 Combine insert and end to add elements to the end of a list
- 3 Fill list with random numbers with generate function
- 4 Initialize a list with values in a vector
- 5 Insert elements of array into a list
- 6 Move position pointer and insert again
Combine insert and begin to add element to the start of 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
std::ostream_iterator< int > output( cout, " " );
// insert items in values
values.push_front( 1 );
values.push_front( 3 );
values.push_back( 4 );
values.push_back( 2 );
cout << "values contains: ";
std::copy( values.begin(), values.end(), output );
values.insert( values.begin(), array, array + 4 );
cout << "\n\nvalues contains: ";
std::copy( values.begin(), values.end(), output );
cout << endl;
return 0;
}
/*
values contains: 3 1 4 2
values contains: 2 6 4 8 3 1 4 2
*/
Combine insert and end to add elements to the end of a list
#include <iostream>
#include <cassert>
#include <algorithm>
#include <string>
#include <list>
#include <iostream>
using namespace std;
void print_list(string s)
{
cout << s << endl;
}
int main()
{
list<string> dlist;
dlist.insert(dlist.end(), "AAA");
dlist.insert(dlist.end(), "BBBB");
dlist.insert(dlist.end(), "CCCCC");
for_each(dlist.begin(), dlist.end(), print_list);
return 0;
}
/*
AAA
BBBB
CCCCC
*/
Fill list with random numbers with generate function
#include <algorithm>
#include <cstdlib>
#include <functional>
#include <iostream>
#include <list>
using namespace std;
int main( )
{
list<int> data( 100000 );
// create random numbers
generate( data.begin(), data.end(), rand );
}
Initialize a list with values in a vector
#include <algorithm>
#include <iostream>
#include <list>
#include <vector>
using namespace std;
int main( )
{
short v[] = { 1, 2, 3, 4, 5, 6 };
vector<short> v1( v,v + sizeof( v ) / sizeof( v[0] ) );
vector<short> v2( v1 );
list<short> l( v1.begin(), v1.end() );
if( v1.size() == l.size() && equal( v1.begin(), v1.end(), l.begin() ) )
cout << "The vector and list are equal" << endl;
else
cout << "The vector and list are not equal" << endl;
}
Insert elements of array into 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
std::ostream_iterator< int > output( cout, " " );
// insert items in values
values.push_front( 1 );
values.push_front( 3 );
values.push_back( 4 );
values.push_back( 2 );
cout << "values contains: ";
std::copy( values.begin(), values.end(), output );
values.insert( values.begin(), array, array + 4 );
cout << "\n\nvalues contains: ";
std::copy( values.begin(), values.end(), output );
cout << endl;
return 0;
}
/*
values contains: 3 1 4 2
values contains: 2 6 4 8 3 1 4 2
*/
Move position pointer and insert again
#include <string>
#include <list>
#include <iostream>
using namespace std;
int main()
{
list<string> staff;
staff.push_back("A");
staff.push_back("B");
staff.push_back("C");
staff.push_back("D");
list<string>::iterator pos;
pos = staff.begin();
pos++;
pos++;
pos++;
staff.insert(pos, "E");
pos = staff.begin();
pos++;
staff.erase(pos);
for (pos = staff.begin(); pos != staff.end(); pos++)
cout << *pos << "\n";
return 0;
}