swap two elements of a vector
std::iter_swap(arr.begin()+pos1,arr.begin()+pos2);swap two elements of a vector
std::iter_swap(arr.begin()+pos1,arr.begin()+pos2);C++ Vector swap syntax
vector<T>().swap(x); // clear x reallocatingC++ Vector swap
// clearing vectors
#include <iostream>
#include <vector>
int main ()
{
std::vector<int> myvector;
myvector.push_back (100);
myvector.push_back (200);
myvector.push_back (300);
std::cout << "myvector contains:";
for (unsigned i=0; i<myvector.size(); i++)
std::cout << ' ' << myvector[i];
std::cout << '\n';
myvector.clear();
myvector.push_back (1101);
myvector.push_back (2202);
std::cout << "myvector contains:";
for (unsigned i=0; i<myvector.size(); i++)
std::cout << ' ' << myvector[i];
std::cout << '\n';
return 0;
}vector Swap
#include <iostream>
#include <vector>
template<class Os, class Co> Os& operator<<(Os& os, const Co& co) {
os << "{";
for (auto const& i : co) { os << ' ' << i; }
return os << " } ";
}
int main()
{
std::vector<int> a1{1, 2, 3}, a2{4, 5};
auto it1 = std::next(a1.begin());
auto it2 = std::next(a2.begin());
int& ref1 = a1.front();
int& ref2 = a2.front();
std::cout << a1 << a2 << *it1 << ' ' << *it2 << ' ' << ref1 << ' ' << ref2 << '\n';
a1.swap(a2);
std::cout << a1 << a2 << *it1 << ' ' << *it2 << ' ' << ref1 << ' ' << ref2 << '\n';
// Note that after swap the iterators and references stay associated with their
// original elements, e.g. it1 that pointed to an element in 'a1' with value 2
// still points to the same element, though this element was moved into 'a2'.
}Copyright © 2021 Codeinu
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