ValidData.hpp

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#pragma once
 
#include <concepts>
#include <stdexcept>
 
namespace srs
{
 
    template <std::default_initializable T>
    class ValidData
    {
      public:
        ValidData() = default;
 
        auto value() -> auto&
        {
            if (not is_valid_)
            {
                throw std::runtime_error("Cannot call value(): ValidData value is not valid!");
            }
            return resource_;
        }
 
        auto get() const -> const auto&
        {
            if (not is_valid_)
            {
                throw std::runtime_error("Cannot call get(): ValidData value is not valid!");
            }
            return resource_;
        }
 
        auto is_valid() -> bool { return is_valid_; }
 
        void invalidate() { is_valid_ = false; }
        void validate() { is_valid_ = true; }
 
        auto operator->() -> T* { return &resource_; }
 
      private:
        bool is_valid_ = false;
        T resource_;
    };
 
} // namespace srs