json_file_reader.h

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#ifndef JSON_FILE_READER_H
#define JSON_FILE_READER_H
 
#include "bitrl/extern/nlohmann/json/json.hpp"
#include "bitrl/utils/io/file_reader_base.h"
 
namespace bitrl
{
namespace utils::io
{
class JSONFileReader final : public FileReaderBase
{
 
  public:
 
    using json = nlohmann::json;
 
    JSONFileReader(const std::string &filename);
 
    virtual void open() override final;
 
    template <typename T> T get_value(const std::string &label) const;
 
    template <typename T> T at(const std::string &label) const;
 
    const json& get(const std::string &label) const{return data_.at(label);};
 
  private:
    json data_;
};
 
template <typename T> T JSONFileReader::get_value(const std::string &label) const
{
    if (!this->is_open())
    {
        throw std::logic_error("JSON file is not open. Have you called open()?");
    }
    return data_[label].template get<T>();
}
 
template <typename T> T JSONFileReader::at(const std::string &label) const
{
    if (!this->is_open())
    {
        throw std::logic_error("JSON file is not open. Have you called open()?");
    }
 
    auto data = data_.at(label);
    return T(data);
}
 
} // namespace utils::io
} // namespace bitrl
#endif // JSON_FILE_READER_H