C++/Vector/vector clear — различия между версиями
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Версия 17:21, 25 мая 2010
Clear a vector
<source lang="cpp">
- include <iostream>
using std::cout; using std::endl;
- include <vector> // vector class-template definition
- include <algorithm> // copy algorithm
- include <iterator> // ostream_iterator iterator
- include <stdexcept> // out_of_range exception
int main() {
int array[ 6 ] = { 1, 2, 3, 4, 5, 6 }; std::vector< int > integers( array, array + 6 ); std::ostream_iterator< int > output( cout, " " ); integers.push_back( 2 ); integers.push_back( 3 ); integers.push_back( 4 ); cout << "Vector integers contains: "; std::copy( integers.begin(), integers.end(), output ); // insert elements from array integers.insert( integers.begin(), array, array + 6 ); cout << "\n\nContents of vector integers before clear: "; std::copy( integers.begin(), integers.end(), output ); // empty integers; clear calls erase to empty a collection integers.clear(); cout << "\nAfter clear, vector integers " << ( integers.empty() ? "is" : "is not" ) << " empty" << endl; return 0;
} /* Vector integers contains: 1 2 3 4 5 6 2 3 4 Contents of vector integers before clear: 1 2 3 4 5 6 1 2 3 4 5 6 2 3 4 After clear, vector integers is empty
*/ </source>