flags.h

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#ifndef LIPH_FLAGS_H_
#define LIPH_FLAGS_H_
 
#include <cstdint>
#include <string>
#include <unordered_map>
#include <vector>
 
#include "liph/string.h"
 
namespace liph {
 
class flags {
public:
    flags() = default;
 
    bool register_bool_flag(const std::string& name, bool default_value = false, std::string help_message = "");
    bool register_int32_flag(const std::string& name, int32_t default_value = 0, std::string help_message = "");
    bool register_double_flag(const std::string& name, double default_value = 0.0, std::string help_message = "");
    bool register_string_flag(const std::string& name, std::string default_value = "", std::string help_message = "");
 
    bool parse_flags(int argc, char ***argv);
 
    bool has_flag(const std::string& name) const;
 
    bool bool_ref(const std::string& name);  // todo: return bool&
    int32_t& int32_ref(const std::string& name);
    double& double_ref(const std::string& name);
    std::string& string_ref(const std::string& name);
 
    std::string help() const;
 
private:
    enum flag_type { flag_bool, flag_int32, flag_double, flag_string };
    struct flag_info {
        flag_type type;
        size_t idx;
        std::string help_message;
    };
    std::unordered_map<std::string, flag_info> registered_flags_;
    std::vector<bool> values_bool_;
    std::vector<int32_t> values_int32_;
    std::vector<double> values_double_;
    std::vector<std::string> values_string_;
 
    bool parse_{false};
    std::vector<char *> new_argv_;
};
 
}  // namespace liph
 
#endif  // LIPH_FLAGS_H_