我如何替换std::vector的某些范围的数据

How do I replace data of some range of std::vector

本文关键字：vector 数据 范围 std 何替换 替换      更新时间：2023-10-16
std::vector<char> v;
v.push_back('a');
v.push_back('b');
v.push_back('c');
v.push_back('d');
v.push_back('e');
v.push_back('f');
char c[3] = { 'z', 'x', 'y' };
// Want to make abzxyf
//v.insert(v.begin() + 2, c, c + 3); // it doesn't work as I wanted.
// Yes it works. but if c is more bigger, it will be crash.
std::copy(c, c + 3, v.begin() + 2);
v.clear();
v.push_back('a');
v.push_back('b');
v.push_back('c');
v.push_back('d');
v.push_back('e');
v.push_back('f');
// If vector needs more memory, I'd let him grow automactically
// So I tried this.(expected abcdezxy)
// But it's result is abcdezxyf. f is still remain.
std::copy(c, c + 3, std::inserter(v, v.begin() + 5));

我应该使用什么算法或方法?

如果sizeof(c)更大，则resize()在copy()之前，这应该是可行的

。

if (sizeof(c) + 2 > v.size())
  v.resize(sizeof(c) + 2);
// now copy
std::copy(c, c + sizeof(c), v.begin() + 2);

如果要进行文本处理，可以考虑使用具有replace函数的std::string。

std::vector没有。您必须使用覆盖成员与insert和erase的适当组合。

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