1 files changed, 38 insertions, 0 deletions
diff --git a/includes/image_io/base/validated_number.h b/includes/image_io/base/validated_number.h
new file mode 100644
index 0000000..ead5ab3
--- /dev/null
+++ b/includes/image_io/base/validated_number.h
@@ -0,0 +1,38 @@
+#ifndef IMAGE_IO_BASE_VALIDATED_NUMBER_H_  // NOLINT
+#define IMAGE_IO_BASE_VALIDATED_NUMBER_H_  // NOLINT
+
+#include <sstream>
+#include <string>
+
+namespace photos_editing_formats {
+namespace image_io {
+
+template <class T>
+struct ValidatedNumber {
+  ValidatedNumber() : ValidatedNumber(T(), false) {}
+  ValidatedNumber(const T& value_, bool is_valid_)
+      : value(value_), is_valid(is_valid_) {}
+  using value_type = T;
+  T value;
+  bool is_valid;
+};
+
+template <class T>
+ValidatedNumber<T> GetValidatedNumber(const std::string& str) {
+  std::stringstream ss(str);
+  ValidatedNumber<T> result;
+  ss >> result.value;
+  if (!ss.fail()) {
+    std::string extra;
+    ss >> extra;
+    if (extra.empty()) {
+      result.is_valid = true;
+    }
+  }
+  return result;
+}
+
+}  // namespace image_io
+}  // namespace photos_editing_formats
+
+#endif  // IMAGE_IO_BASE_VALIDATED_NUMBER_H_  // NOLINT