在预C++ 11中将字符串列表填充到向量中

Question

首先,如果这是一个令人眼花缭乱的简单而明显的问题,我想道歉.我知道对于拥有专业知识的人来说,这是一件相当容易的事情.C++ 11允许以列表形式初始化向量:

std::vector<std::string> v = {
    "this is a",
    "list of strings",
    "which are going",
    "to be stored",
    "in a vector"};

但这在旧版本中不可用.我一直在努力想出填充字符串向量的最佳方法,到目前为止我唯一能想到的就是:

std::string s1("this is a");
std::string s2("list of strings");
std::string s3("which are going");
std::string s4("to be stored");
std::string s5("in a vector");

std::vector<std::string> v;
v.push_back(s1);
v.push_back(s2);
v.push_back(s3);
v.push_back(s4);
v.push_back(s5);

它有效,但写作有点苦差事,我相信有更好的方法.

Answer 1

规范的方法是在合适的头文件中定义begin()和end()运行,并使用以下内容:

char const* array[] = {
    "this is a",
    "list of strings",
    "which are going",
    "to be stored",
    "in a vector"
};
std::vector<std::string> vec(begin(array), end(array));

函数begin()和end()定义如下:

template <typename T, int Size>
T* begin(T (&array)[Size]) {
    return array;
}
template <typename T, int Size>
T* end(T (&array)[Size]) {
    return array + Size;
}