88 lines
1.7 KiB
C++
88 lines
1.7 KiB
C++
#include <cctype>
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#include <string>
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namespace std {
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int stoi(const std::string &str, size_t *pos, int base) {
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//TODO: exceptions
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size_t i = 0;
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while (isspace(str[i]))
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++i;
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bool is_negative = false;
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if (str[i] == '-') {
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is_negative = true;
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++i;
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}
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else if (str[i] == '+')
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++i;
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if ((base == 16 || base == 0) && str[i] == '0' &&
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(str[i + 1] == 'x' || str[i + 1] == 'X')) {
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base = 16;
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i += 2;
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}
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else if ((base == 8 || base == 0) && str[i] == '0') {
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base = 8;
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++i;
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}
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else if (base == 0)
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base = 10;
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int value = 0;
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while (true) {
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char c = str[i];
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if (c >= '0' && c < '0' + base)
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value = value * base + c - '0';
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else if (c >= 'a' && c < 'a' + base - 10)
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value = value * base + c - 'a' + 10;
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else if (c >= 'A' && c < 'A' + base - 10)
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value = value * base + c - 'A' + 10;
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else
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break;
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++i;
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}
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if (pos != 0)
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*pos = i;
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return is_negative ? -value : value;
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}
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std::string to_string(int value) {
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int max_place = 1;
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int places = 1;
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while (max_place <= value / 10) {
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max_place *= 10;
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++places;
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}
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std::string s;
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s.resize(places);
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for (int i = 0; i < places; ++i) {
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s[i] = (value / max_place) % 10 + '0';
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max_place /= 10;
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}
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return s;
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}
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std::string operator +(std::string &&lhs, std::string &&rhs) {
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size_t og_lhs_s = lhs.size();
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std::string s = std::move(lhs);
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s.resize(og_lhs_s + rhs.size());
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for (size_t i = 0; i < rhs.size(); ++i)
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s[og_lhs_s + i] = rhs[i];
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rhs.clear();
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return s;
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}
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}
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