原測試代碼如下：

int main() {vector<int>v1{1,3,5,7,9,2,4,6,8};allocator<int>alloc;auto data = alloc.allocate(9);uninitialized_copy(v1.begin(),v1.end(), data);auto end = data + 9;while(data!=end) {cout << *data <<" ";data++;}cout << endl;system("pause");return 0; }

運行后報錯界面如下：

1>------ 已啟動生成: 項目: ConsoleApplication1, 配置: Debug Win32 ------ 1> test2.cpp 1>e:\0000softwareinstall\visualstudio\vc\include\xmemory(350): error C4996: 'std::_Uninitialized_copy0': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' 1> e:\0000softwareinstall\visualstudio\vc\include\xmemory(336): note: 參見“std::_Uninitialized_copy0”的聲明 1> e:\study\c++\primer練習程序\consoleapplication1\consoleapplication1\test2.cpp(10): note: 參見對正在編譯的函數 模板 實例化“_FwdIt std::uninitialized_copy<std::_Vector_iterator<std::_Vector_val<std::_Simple_types<int>>>,int*>(_InIt,_InIt,_FwdIt)”的引用 1> with 1> [ 1> _FwdIt=int *, 1> _InIt=std::_Vector_iterator<std::_Vector_val<std::_Simple_types<int>>> 1> ]

在其頭部加#define _SCL_SECURE_NO_WARNINGS，即可運行成功

#define _SCL_SECURE_NO_WARNINGS #include<vector> # include<iostream> using namespace std;int main() {vector<int>v1{ 1,3,5,7,9,2,4,6,8 };allocator<int>alloc;auto data = alloc.allocate(9);uninitialized_copy(v1.begin(), v1.end(), data);auto end = data + 9;while (data != end) {cout << *data << " ";data++;}cout << endl;system("pause");return 0; }

輸出結果為：

1 3 5 7 9 2 4 6 8

即，我們將v1中的數據拷貝到了以data為起始地址的內存中

測試代碼二：

#define _SCL_SECURE_NO_WARNINGS #include<vector> # include<iostream> using namespace std;int main() {vector<int>v1{ 2,4 };vector<int>v2{ 1,3,5,7,9,2,4,6,8 };uninitialized_copy(v1.begin(), v1.end(), v2.begin());for (auto a:v2) {cout << a << " ";}cout << endl;system("pause");return 0; }

輸出結果：

2 4 5 7 9 2 4 6 8

總結

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