argument.h

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#ifndef KOUTIL_ARGS_ARGUMENT_H
#define KOUTIL_ARGS_ARGUMENT_H
 
#include "koutil/args/handle.h"
#include "koutil/args/result.h"
#include <functional>
#include <string_view>
 
namespace koutil::args {
 
template <extends_result Result = result_base_t> class argument_t {
public:
    using result_t = Result;
 
    using handle_t = std::function<void(std::string_view, result_t&)>;
 
    explicit argument_t(std::string_view name, std::string_view description)
        : m_name(name)
        , m_description(description)
        , m_handle(nullptr) { }
 
    template <void_handle<std::string_view, result_t&> Handle>
    explicit argument_t(std::string_view name, std::string_view description, Handle&& handle)
        : m_name(name)
        , m_description(description)
        , m_handle(std::forward<Handle>(handle)) { }
 
    [[nodiscard]] std::string_view name() const { return m_name; }
 
    [[nodiscard]] std::string_view description() const { return m_description; }
 
    void process(std::string_view value, result_t& result) const;
 
private:
    std::string_view m_name;
    std::string_view m_description;
 
    handle_t m_handle;
};
 
template <extends_result Result> void argument_t<Result>::process(std::string_view value, result_t& result) const {
    if (m_handle) {
        m_handle(value, result);
    }
}
 
}
 
#endif