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#pragma once
#include <cstddef>
#include <vector>
namespace std {
class string {
std::vector<char> characters;
public:
constexpr string() : characters({'\0'}) {}
constexpr string(const string &other)
: characters(other.characters) {}
constexpr string(string &&other) noexcept
: characters(std::move(other.characters)) {
other.characters.push_back('\0');
}
constexpr string(const char *s) {
size_t count = 0;
while (s[count] != '\0')
++count;
characters.resize(count + 1);
for (size_t i = 0; i <= count; ++i)
characters[i] = s[i];
}
constexpr ~string() {}
constexpr string &operator =(const string &str) {
characters = str.characters;
return *this;
}
constexpr string &operator =(string &&str) noexcept {
characters = std::move(str.characters);
str.characters.push_back('\0');
return *this;
}
constexpr size_t size() const noexcept {
return characters.size() - 1;
}
constexpr void resize(size_t count) {
if (count < characters.size() - 1) {
characters.resize(count + 1);
characters[count] = '\0';
}
else if (count > characters.size() - 1)
characters.resize(count + 1);
}
constexpr void clear() noexcept {
resize(0);
}
constexpr const char *data() const noexcept {
return characters.data();
}
constexpr char *data() noexcept {
return characters.data();
}
constexpr char &operator[](size_t pos) {
return characters[pos];
}
constexpr const char &operator[](size_t pos) const {
return characters[pos];
}
};
}
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