lib/string/converter.hpp

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• Last update: 2025-07-08 15:34:19+09:00
• Include: #include "lib/string/converter.hpp"

Code

#pragma once
#include <locale>
#include <string>
#include <vector>

struct string_converter {
    char type(const char &c) const {
        return (std::islower(c) ? 'a' : std::isupper(c) ? 'A' : std::isdigit(c) ? '0' : 0);
    }
    int convert(const char &c) {
        if (!start) start = type(c);
        return c - start;
    }
    int convert(const char &c, const std::string &chars) { return chars.find(c); }
    template <class T>
    auto convert(const T &v) {
        std::vector<decltype(convert(v[0]))> res;
        res.reserve(v.size());
        for (auto &&e : v) res.emplace_back(convert(e));
        return res;
    }
    template <class T>
    auto convert(const T &v, const std::string &chars) {
        std::vector<decltype(convert(v[0], chars))> res;
        res.reserve(v.size());
        for (auto &&e : v) res.emplace_back(convert(e, chars));
        return res;
    }
    int operator()(const char &v, char s = 0) {
        start = s;
        return convert(v);
    }
    int operator()(const char &v, const std::string &chars) { return convert(v, chars); }
    template <class T>
    auto operator()(const T &v, char s = 0) {
        start = s;
        return convert(v);
    }
    template <class T>
    auto operator()(const T &v, const std::string &chars) {
        return convert(v, chars);
    }

  private:
    char start = 0;
} to_int;

#line 2 "lib/string/converter.hpp"
#include <locale>
#include <string>
#include <vector>

struct string_converter {
    char type(const char &c) const {
        return (std::islower(c) ? 'a' : std::isupper(c) ? 'A' : std::isdigit(c) ? '0' : 0);
    }
    int convert(const char &c) {
        if (!start) start = type(c);
        return c - start;
    }
    int convert(const char &c, const std::string &chars) { return chars.find(c); }
    template <class T>
    auto convert(const T &v) {
        std::vector<decltype(convert(v[0]))> res;
        res.reserve(v.size());
        for (auto &&e : v) res.emplace_back(convert(e));
        return res;
    }
    template <class T>
    auto convert(const T &v, const std::string &chars) {
        std::vector<decltype(convert(v[0], chars))> res;
        res.reserve(v.size());
        for (auto &&e : v) res.emplace_back(convert(e, chars));
        return res;
    }
    int operator()(const char &v, char s = 0) {
        start = s;
        return convert(v);
    }
    int operator()(const char &v, const std::string &chars) { return convert(v, chars); }
    template <class T>
    auto operator()(const T &v, char s = 0) {
        start = s;
        return convert(v);
    }
    template <class T>
    auto operator()(const T &v, const std::string &chars) {
        return convert(v, chars);
    }

  private:
    char start = 0;
} to_int;

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