C++ 如何将 std::string 复制到 std::vector<char> 中？
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How to copy std::string into std::vector<char>?
提问by myWallJSON
Possible Duplicate:
Converting std::string to std::vector<char>
I tried:
我试过：
std::string str = "hello";
std::vector<char> data;
std::copy(str.c_str(), str.c_str()+str.length(), data);
but it does not work=( So I wonder How to copy std::stringinto std::vector<char>or std::vector<uchar>?
但它不起作用=（所以我想知道如何复制std::string到std::vector<char>或std::vector<uchar>？
回答by R. Martinho Fernandes
std::vectorhas a constructor that takes two iterators. You can use that:
std::vector有一个带有两个迭代器的构造函数。你可以使用它：
std::string str = "hello";
std::vector<char> data(str.begin(), str.end());
If you already have a vector and want to add the characters at the end, you need a back inserter:
如果你已经有一个向量并且想在最后添加字符，你需要一个后置插入器：
std::string str = "hello";
std::vector<char> data = /* ... */;
std::copy(str.begin(), str.end(), std::back_inserter(data));
回答by dasblinkenlight
You need a back inserter to copy into vectors:
您需要一个后置插入器来复制到向量中：
std::copy(str.c_str(), str.c_str()+str.length(), back_inserter(data));
