mirror of
https://github.com/eledio-devices/thirdparty-ArduinoJson.git
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321 lines
9.3 KiB
C++
321 lines
9.3 KiB
C++
// ArduinoJson - arduinojson.org
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// Copyright Benoit Blanchon 2014-2018
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// MIT License
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#pragma once
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#include <stddef.h>
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#include <stdint.h> // for uint8_t
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#include "../Memory/MemoryPool.hpp"
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#include "../Misc/Visitable.hpp"
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#include "../Numbers/parseFloat.hpp"
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#include "../Numbers/parseInteger.hpp"
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#include "../Operators/VariantOperators.hpp"
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#include "../Polyfills/type_traits.hpp"
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#include "VariantAs.hpp"
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#include "VariantFunctions.hpp"
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#include "VariantRef.hpp"
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namespace ARDUINOJSON_NAMESPACE {
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// Forward declarations.
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class ArrayRef;
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class ObjectRef;
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// Contains the methods shared by VariantRef and VariantConstRef
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template <typename TData>
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class VariantRefBase {
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public:
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// Tells wether the variant has the specified type.
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// Returns true if the variant has type type T, false otherwise.
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//
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// bool is<char>() const;
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// bool is<signed char>() const;
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// bool is<signed short>() const;
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// bool is<signed int>() const;
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// bool is<signed long>() const;
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// bool is<unsigned char>() const;
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// bool is<unsigned short>() const;
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// bool is<unsigned int>() const;
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// bool is<unsigned long>() const;
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template <typename T>
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FORCE_INLINE typename enable_if<is_integral<T>::value, bool>::type is()
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const {
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return variantIsInteger(_data);
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}
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//
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// bool is<double>() const;
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// bool is<float>() const;
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template <typename T>
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FORCE_INLINE typename enable_if<is_floating_point<T>::value, bool>::type is()
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const {
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return variantIsFloat(_data);
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}
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//
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// bool is<bool>() const
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template <typename T>
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FORCE_INLINE typename enable_if<is_same<T, bool>::value, bool>::type is()
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const {
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return variantIsBoolean(_data);
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}
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//
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// bool is<const char*>() const;
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// bool is<char*>() const;
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// bool is<std::string>() const;
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// bool is<String>() const;
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template <typename T>
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FORCE_INLINE typename enable_if<is_same<T, const char *>::value ||
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is_same<T, char *>::value ||
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IsWriteableString<T>::value,
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bool>::type
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is() const {
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return variantIsString(_data);
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}
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//
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// bool is<ArrayRef> const;
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// bool is<const ArrayRef> const;
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template <typename T>
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FORCE_INLINE typename enable_if<
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is_same<typename remove_const<T>::type, ArrayRef>::value, bool>::type
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is() const {
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return variantIsArray(_data);
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}
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//
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// bool is<ObjectRef> const;
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// bool is<const ObjectRef> const;
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template <typename T>
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FORCE_INLINE typename enable_if<
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is_same<typename remove_const<T>::type, ObjectRef>::value, bool>::type
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is() const {
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return variantIsObject(_data);
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}
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FORCE_INLINE bool isNull() const {
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return variantIsNull(_data);
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}
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size_t size() const {
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return variantSize(_data);
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}
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protected:
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VariantRefBase(TData *data) : _data(data) {}
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TData *_data;
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};
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// A variant that can be a any value serializable to a JSON value.
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//
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// It can be set to:
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// - a boolean
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// - a char, short, int or a long (signed or unsigned)
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// - a string (const char*)
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// - a reference to a ArrayRef or ObjectRef
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class VariantRef : public VariantRefBase<VariantData>,
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public VariantOperators<VariantRef>,
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public Visitable {
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typedef VariantRefBase<VariantData> base_type;
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friend class VariantConstRef;
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public:
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// Intenal use only
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FORCE_INLINE VariantRef(MemoryPool *pool, VariantData *data)
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: base_type(data), _pool(pool) {}
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// Creates an uninitialized VariantRef
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FORCE_INLINE VariantRef() : base_type(0), _pool(0) {}
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// set(bool value)
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FORCE_INLINE bool set(bool value) const {
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return variantSetBoolean(_data, value);
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}
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// set(double value);
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// set(float value);
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template <typename T>
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FORCE_INLINE bool set(
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T value,
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typename enable_if<is_floating_point<T>::value>::type * = 0) const {
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return variantSetFloat(_data, static_cast<Float>(value));
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}
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// set(char)
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// set(signed short)
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// set(signed int)
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// set(signed long)
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// set(signed char)
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template <typename T>
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FORCE_INLINE bool set(
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T value,
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typename enable_if<is_integral<T>::value && is_signed<T>::value>::type * =
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0) const {
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return variantSetSignedInteger(_data, value);
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}
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// set(unsigned short)
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// set(unsigned int)
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// set(unsigned long)
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template <typename T>
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FORCE_INLINE bool set(
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T value, typename enable_if<is_integral<T>::value &&
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is_unsigned<T>::value>::type * = 0) const {
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return variantSetUnsignedInteger(_data, static_cast<UInt>(value));
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}
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// set(SerializedValue<const char *>)
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FORCE_INLINE bool set(SerializedValue<const char *> value) const {
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return variantSetLinkedRaw(_data, value);
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}
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// set(SerializedValue<std::string>)
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// set(SerializedValue<String>)
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// set(SerializedValue<const __FlashStringHelper*>)
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template <typename T>
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FORCE_INLINE bool set(
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SerializedValue<T> value,
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typename enable_if<!is_same<const char *, T>::value>::type * = 0) const {
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return variantSetOwnedRaw(_data, value, _pool);
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}
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// set(const std::string&)
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// set(const String&)
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template <typename T>
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FORCE_INLINE bool set(
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const T &value,
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typename enable_if<IsString<T>::value>::type * = 0) const {
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return variantSetOwnedString(_data, wrapString(value), _pool);
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}
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// set(char*)
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// set(const __FlashStringHelper*)
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template <typename T>
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FORCE_INLINE bool set(
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T *value, typename enable_if<IsString<T *>::value>::type * = 0) const {
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return variantSetOwnedString(_data, wrapString(value), _pool);
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}
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// set(const char*);
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FORCE_INLINE bool set(const char *value) const {
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return variantSetLinkedString(_data, value);
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}
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bool set(VariantConstRef value) const;
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bool set(VariantRef value) const;
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FORCE_INLINE bool set(ArrayRef array) const;
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FORCE_INLINE bool set(const ArraySubscript &) const;
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FORCE_INLINE bool set(ObjectRef object) const;
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template <typename TString>
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FORCE_INLINE bool set(const ObjectSubscript<TString> &) const;
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// Get the variant as the specified type.
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//
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// std::string as<std::string>() const;
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// String as<String>() const;
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template <typename T>
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FORCE_INLINE typename enable_if<!is_same<T, ArrayRef>::value &&
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!is_same<T, ObjectRef>::value &&
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!is_same<T, VariantRef>::value,
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typename VariantAs<T>::type>::type
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as() const {
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return variantAs<T>(_data);
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}
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//
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// ArrayRef as<ArrayRef>() const;
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// const ArrayRef as<const ArrayRef>() const;
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template <typename T>
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FORCE_INLINE typename enable_if<is_same<T, ArrayRef>::value, T>::type as()
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const;
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//
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// ObjectRef as<ObjectRef>() const;
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// const ObjectRef as<const ObjectRef>() const;
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template <typename T>
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FORCE_INLINE typename enable_if<is_same<T, ObjectRef>::value, T>::type as()
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const;
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//
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// VariantRef as<VariantRef> const;
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template <typename T>
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FORCE_INLINE typename enable_if<is_same<T, VariantRef>::value, T>::type as()
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const {
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return *this;
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}
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template <typename Visitor>
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void accept(Visitor &visitor) const {
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variantAccept(_data, visitor);
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}
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FORCE_INLINE bool operator==(VariantRef lhs) const {
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return variantEquals(_data, lhs._data);
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}
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FORCE_INLINE bool operator!=(VariantRef lhs) const {
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return !variantEquals(_data, lhs._data);
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}
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// Change the type of the variant
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//
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// ArrayRef to<ArrayRef>()
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template <typename T>
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typename enable_if<is_same<T, ArrayRef>::value, ArrayRef>::type to() const;
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//
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// ObjectRef to<ObjectRef>()
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template <typename T>
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typename enable_if<is_same<T, ObjectRef>::value, ObjectRef>::type to() const;
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//
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// ObjectRef to<VariantRef>()
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template <typename T>
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typename enable_if<is_same<T, VariantRef>::value, VariantRef>::type to()
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const;
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private:
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MemoryPool *_pool;
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};
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class VariantConstRef : public VariantRefBase<const VariantData>,
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public VariantOperators<VariantConstRef>,
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public Visitable {
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typedef VariantRefBase<const VariantData> base_type;
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friend class VariantRef;
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public:
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VariantConstRef() : base_type(0) {}
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VariantConstRef(const VariantData *data) : base_type(data) {}
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VariantConstRef(VariantRef var) : base_type(var._data) {}
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template <typename Visitor>
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void accept(Visitor &visitor) const {
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variantAccept(_data, visitor);
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}
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// Get the variant as the specified type.
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//
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template <typename T>
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FORCE_INLINE typename VariantConstAs<T>::type as() const {
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return variantAs<typename VariantConstAs<T>::type>(_data);
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}
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FORCE_INLINE VariantConstRef operator[](size_t index) const;
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//
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// const VariantConstRef operator[](TKey) const;
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// TKey = const std::string&, const String&
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template <typename TString>
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FORCE_INLINE
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typename enable_if<IsString<TString>::value, VariantConstRef>::type
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operator[](const TString &key) const {
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return VariantConstRef(objectGet(variantAsObject(_data), wrapString(key)));
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}
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//
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// VariantConstRef operator[](TKey);
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// TKey = const char*, const char[N], const __FlashStringHelper*
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template <typename TString>
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FORCE_INLINE
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typename enable_if<IsString<TString *>::value, VariantConstRef>::type
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operator[](TString *key) const {
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const CollectionData *obj = variantAsObject(_data);
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return VariantConstRef(obj ? obj->get(wrapString(key)) : 0);
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}
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};
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} // namespace ARDUINOJSON_NAMESPACE
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