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C++ STL copy, move 用法

news 2025/7/21 15:35:28

一：功能

正向（从前向后的顺序）拷贝/移动操作，将一个容器元素拷贝/移动到另一容器中。

二：用法

#include <iostream>
#include <vector>
#include <algorithm>int main() {std::vector<std::string> data{ "a", "b", "c", "d", "e", "f"};for (auto v : data)std::cout << v << " ";std::cout << "\n";std::copy(data.begin(), data.begin()+3, data.begin()+3);for (auto v : data)std::cout << v << " ";std::cout << "\n";// Overlapping case:std::copy(std::next(data.begin()), data.end(), data.begin());for (auto v : data)std::cout << v << " ";std::cout << "\n";
}

#include <iostream>
#include <vector>
#include <iomanip>
#include <algorithm>int main() {std::vector<std::string> data{ "a", "b", "c", "d", "e", "f"};for (auto &v : data)std::cout << std::quoted(v) << " ";std::cout << "\n";//"a" "b" "c" "d" "e" "f" std::move(data.begin(), data.begin()+3, data.begin()+3);for (auto &v : data)std::cout << std::quoted(v) << " ";std::cout << "\n";//"" "" "" "a" "b" "c" 
}

#include <iostream>
#include <vector>
#include <algorithm>struct CopyOnly {CopyOnly() = default;CopyOnly(const CopyOnly&) = default;CopyOnly& operator=(const CopyOnly&) { std::cout << "Copy assignment.\n";return *this;};
};int main() {std::vector<CopyOnly> test(6);//移动操作取决于底层元素类型，如果不支持移动操作，实际还是走的拷贝操作std::move(test.begin(), test.begin()+3, test.begin()+3);
}

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