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avoiding_copies.cpp
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avoiding_copies.cpp
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//
// Created by Jonathan Hollocombe on 13/06/2016.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <vector>
#include <iostream>
struct BigData {
BigData() : vec(1000000) {}
BigData(const BigData& other) {
std::cout << "i've been copied\n";
vec = other.vec;
}
BigData(BigData&& other) {
std::cout << "i've been moved\n";
vec = std::move(other.vec);
}
private:
std::vector<int> vec;
};
BigData&& g(BigData&& vec)
{
return std::move(vec);
}
BigData f()
{
BigData data;
return g(std::move(data));
}
int main()
{
auto data = f();
return 0;
}