Program Listing for File static_string.hpp

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#pragma once

#include <array>
#include <cassert>
#include <string>
#include <string_view>

namespace rsl {

template <size_t capacity>
class StaticString {
    std::array<std::string::value_type, capacity> data_{};
    size_t size_{};

   public:
    StaticString() = default;

    StaticString(std::string const& string) : size_(std::min(string.size(), capacity)) {
        assert(string.size() <= capacity &&
               "rsl::StaticString::StaticString: Input exceeds capacity");
        std::copy(string.cbegin(), string.cbegin() + std::string::difference_type(size_),
                  data_.begin());
    }
    [[nodiscard]] auto begin() const { return data_.cbegin(); }

    [[nodiscard]] auto end() const { return data_.cbegin() + size_; }

    operator std::string_view() const { return std::string_view(data_.data(), size_); }
};

template <size_t capacity>
[[nodiscard]] auto to_string(StaticString<capacity> const& static_string) {
    return std::string(static_string);
}

}  // namespace rsl