Function optional_i64

include/engine/framework/io/json.h:97–100

inline std::string require_string(const Value & object, const std::string & key) {
    return object.require(key).as_string();
}

inline int64_t optional_i64(const Value & object, const std::string & key, int64_t default_value) {
    const auto * value = object.find(key);
    return value != nullptr && value->is_number() ? value->as_i64() : default_value;
}