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https://github.com/eledio-devices/thirdparty-ArduinoJson.git
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97 lines
2.3 KiB
C++
97 lines
2.3 KiB
C++
// ArduinoJson - arduinojson.org
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// Copyright Benoit Blanchon 2014-2019
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// MIT License
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#pragma once
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#include <ArduinoJson/Strings/IsWriteableString.hpp>
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namespace ARDUINOJSON_NAMESPACE {
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class ArrayRef;
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class ArrayConstRef;
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class ObjectRef;
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class ObjectConstRef;
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class VariantRef;
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class VariantConstRef;
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// A metafunction that returns the type of the value returned by
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// VariantRef::as<T>()
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template <typename T>
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struct VariantAs {
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typedef T type;
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};
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template <>
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struct VariantAs<char*> {
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typedef const char* type;
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};
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// A metafunction that returns the type of the value returned by
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// VariantRef::as<T>()
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template <typename T>
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struct VariantConstAs {
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typedef typename VariantAs<T>::type type;
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};
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template <>
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struct VariantConstAs<VariantRef> {
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typedef VariantConstRef type;
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};
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template <>
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struct VariantConstAs<ObjectRef> {
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typedef ObjectConstRef type;
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};
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template <>
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struct VariantConstAs<ArrayRef> {
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typedef ArrayConstRef type;
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};
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// ---
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template <typename T>
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inline typename enable_if<is_integral<T>::value, T>::type variantAs(
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const VariantData* _data) {
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return _data != 0 ? _data->asIntegral<T>() : T(0);
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}
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template <typename T>
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inline typename enable_if<is_same<T, bool>::value, T>::type variantAs(
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const VariantData* _data) {
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return _data != 0 ? _data->asBoolean() : false;
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}
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template <typename T>
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inline typename enable_if<is_floating_point<T>::value, T>::type variantAs(
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const VariantData* _data) {
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return _data != 0 ? _data->asFloat<T>() : T(0);
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}
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template <typename T>
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inline typename enable_if<is_same<T, const char*>::value ||
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is_same<T, char*>::value,
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const char*>::type
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variantAs(const VariantData* _data) {
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return _data != 0 ? _data->asString() : 0;
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}
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template <typename T>
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inline typename enable_if<is_same<ArrayConstRef, T>::value, T>::type variantAs(
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const VariantData* _data);
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template <typename T>
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inline typename enable_if<is_same<ObjectConstRef, T>::value, T>::type variantAs(
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const VariantData* _data);
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template <typename T>
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inline typename enable_if<is_same<VariantConstRef, T>::value, T>::type
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variantAs(const VariantData* _data);
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template <typename T>
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inline typename enable_if<IsWriteableString<T>::value, T>::type variantAs(
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const VariantData* _data);
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} // namespace ARDUINOJSON_NAMESPACE
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