From efa55eb5b3d3a4942789bdf397c3a6d6226475d4 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <daniel.friesel@uos.de>
Date: Mon, 7 Sep 2020 12:57:22 +0200
Subject: Revert "remove external libraries from main branch"

This reverts commit 0558244645611f314f47e0fa427f7323ce253eaf.
---
 include/lib/ArduinoJson/JsonVariantOr.hpp | 52 +++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 include/lib/ArduinoJson/JsonVariantOr.hpp

(limited to 'include/lib/ArduinoJson/JsonVariantOr.hpp')

diff --git a/include/lib/ArduinoJson/JsonVariantOr.hpp b/include/lib/ArduinoJson/JsonVariantOr.hpp
new file mode 100644
index 0000000..d8022fc
--- /dev/null
+++ b/include/lib/ArduinoJson/JsonVariantOr.hpp
@@ -0,0 +1,52 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+#include "Data/JsonVariantAs.hpp"
+#include "Polyfills/attributes.hpp"
+#include "TypeTraits/EnableIf.hpp"
+#include "TypeTraits/IsIntegral.hpp"
+
+namespace ArduinoJson {
+namespace Internals {
+
+template <typename TImpl>
+class JsonVariantOr {
+ public:
+  // Returns the default value if the JsonVariant is undefined of incompatible
+  template <typename T>
+  typename EnableIf<!IsIntegral<T>::value, T>::type operator|(
+      const T &defaultValue) const {
+    if (impl()->template is<T>())
+      return impl()->template as<T>();
+    else
+      return defaultValue;
+  }
+
+  // Returns the default value if the JsonVariant is undefined of incompatible
+  // Special case for string: null is treated as undefined
+  const char *operator|(const char *defaultValue) const {
+    const char *value = impl()->template as<const char *>();
+    return value ? value : defaultValue;
+  }
+
+  // Returns the default value if the JsonVariant is undefined of incompatible
+  // Special case for integers: we also accept double
+  template <typename Integer>
+  typename EnableIf<IsIntegral<Integer>::value, Integer>::type operator|(
+      const Integer &defaultValue) const {
+    if (impl()->template is<double>())
+      return impl()->template as<Integer>();
+    else
+      return defaultValue;
+  }
+
+ private:
+  const TImpl *impl() const {
+    return static_cast<const TImpl *>(this);
+  }
+};
+}  // namespace Internals
+}  // namespace ArduinoJson
-- 
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