Function optional_string

include/engine/framework/io/json.h:116–119

inline int optional_i32(const Value & object, const std::string & key, int default_value) {
    return static_cast<int>(optional_i64(object, key, default_value));
}

inline float optional_f32(const Value & object, const std::string & key, float default_value) {
    const auto * value = object.find(key);
    return value != nullptr && value->is_number() ? value->as_f32() : default_value;
}