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