228 wiersze
6.7 KiB
C++
228 wiersze
6.7 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 "Data/JsonBufferAllocated.hpp"
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#include "Data/List.hpp"
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#include "Data/ReferenceType.hpp"
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#include "Data/ValueSaver.hpp"
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#include "JsonVariant.hpp"
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#include "Serialization/JsonPrintable.hpp"
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#include "StringTraits/StringTraits.hpp"
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#include "TypeTraits/EnableIf.hpp"
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#include "TypeTraits/IsArray.hpp"
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#include "TypeTraits/IsFloatingPoint.hpp"
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#include "TypeTraits/IsSame.hpp"
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// Returns the size (in bytes) of an array with n elements.
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// Can be very handy to determine the size of a StaticJsonBuffer.
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#define JSON_ARRAY_SIZE(NUMBER_OF_ELEMENTS) \
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(sizeof(JsonArray) + (NUMBER_OF_ELEMENTS) * sizeof(JsonArray::node_type))
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namespace ArduinoJson {
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// Forward declarations
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class JsonObject;
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class JsonBuffer;
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namespace Internals {
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class JsonArraySubscript;
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}
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// An array of JsonVariant.
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//
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// The constructor is private, instances must be created via
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// JsonBuffer::createArray() or JsonBuffer::parseArray().
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// A JsonArray can be serialized to a JSON string via JsonArray::printTo().
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// It can also be deserialized from a JSON string via JsonBuffer::parseArray().
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class JsonArray : public Internals::JsonPrintable<JsonArray>,
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public Internals::ReferenceType,
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public Internals::NonCopyable,
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public Internals::List<JsonVariant>,
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public Internals::JsonBufferAllocated {
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public:
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// Create an empty JsonArray attached to the specified JsonBuffer.
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// You should not call this constructor directly.
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// Instead, use JsonBuffer::createArray() or JsonBuffer::parseArray().
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explicit JsonArray(JsonBuffer *buffer) throw()
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: Internals::List<JsonVariant>(buffer) {}
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// Gets the value at the specified index
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const Internals::JsonArraySubscript operator[](size_t index) const;
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// Gets or sets the value at specified index
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Internals::JsonArraySubscript operator[](size_t index);
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// Adds the specified value at the end of the array.
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//
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// bool add(TValue);
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// TValue = bool, long, int, short, float, double, RawJson, JsonVariant,
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// std::string, String, JsonArray, JsonObject
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template <typename T>
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bool add(const T &value) {
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return add_impl<const T &>(value);
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}
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//
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// bool add(TValue);
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// TValue = char*, const char*, const FlashStringHelper*
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template <typename T>
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bool add(T *value) {
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return add_impl<T *>(value);
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}
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//
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// bool add(TValue value, uint8_t decimals);
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// TValue = float, double
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template <typename T>
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DEPRECATED("Second argument is not supported anymore")
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bool add(T value, uint8_t) {
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return add_impl<const JsonVariant &>(JsonVariant(value));
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}
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// Sets the value at specified index.
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//
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// bool add(size_t index, const TValue&);
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// TValue = bool, long, int, short, float, double, RawJson, JsonVariant,
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// std::string, String, JsonArray, JsonObject
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template <typename T>
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bool set(size_t index, const T &value) {
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return set_impl<const T &>(index, value);
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}
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//
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// bool add(size_t index, TValue);
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// TValue = char*, const char*, const FlashStringHelper*
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template <typename T>
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bool set(size_t index, T *value) {
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return set_impl<T *>(index, value);
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}
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//
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// bool set(size_t index, TValue value, uint8_t decimals);
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// TValue = float, double
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template <typename T>
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typename Internals::EnableIf<Internals::IsFloatingPoint<T>::value, bool>::type
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set(size_t index, T value, uint8_t decimals) {
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return set_impl<const JsonVariant &>(index, JsonVariant(value, decimals));
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}
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// Gets the value at the specified index.
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template <typename T>
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typename Internals::JsonVariantAs<T>::type get(size_t index) const {
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const_iterator it = begin() += index;
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return it != end() ? it->as<T>() : Internals::JsonVariantDefault<T>::get();
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}
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// Check the type of the value at specified index.
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template <typename T>
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bool is(size_t index) const {
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const_iterator it = begin() += index;
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return it != end() ? it->is<T>() : false;
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}
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// Creates a JsonArray and adds a reference at the end of the array.
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// It's a shortcut for JsonBuffer::createArray() and JsonArray::add()
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JsonArray &createNestedArray();
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// Creates a JsonObject and adds a reference at the end of the array.
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// It's a shortcut for JsonBuffer::createObject() and JsonArray::add()
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JsonObject &createNestedObject();
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// Removes element at specified index.
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void remove(size_t index) {
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remove(begin() += index);
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}
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using Internals::List<JsonVariant>::remove;
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// Returns a reference an invalid JsonArray.
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// This object is meant to replace a NULL pointer.
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// This is used when memory allocation or JSON parsing fail.
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static JsonArray &invalid() {
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static JsonArray instance(NULL);
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return instance;
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}
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// Imports a 1D array
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template <typename T, size_t N>
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bool copyFrom(T (&array)[N]) {
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return copyFrom(array, N);
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}
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// Imports a 1D array
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template <typename T>
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bool copyFrom(T *array, size_t len) {
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bool ok = true;
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for (size_t i = 0; i < len; i++) {
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ok &= add(array[i]);
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}
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return ok;
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}
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// Imports a 2D array
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template <typename T, size_t N1, size_t N2>
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bool copyFrom(T (&array)[N1][N2]) {
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bool ok = true;
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for (size_t i = 0; i < N1; i++) {
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JsonArray &nestedArray = createNestedArray();
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for (size_t j = 0; j < N2; j++) {
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ok &= nestedArray.add(array[i][j]);
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}
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}
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return ok;
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}
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// Exports a 1D array
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template <typename T, size_t N>
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size_t copyTo(T (&array)[N]) const {
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return copyTo(array, N);
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}
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// Exports a 1D array
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template <typename T>
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size_t copyTo(T *array, size_t len) const {
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size_t i = 0;
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for (const_iterator it = begin(); it != end() && i < len; ++it)
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array[i++] = *it;
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return i;
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}
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// Exports a 2D array
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template <typename T, size_t N1, size_t N2>
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void copyTo(T (&array)[N1][N2]) const {
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size_t i = 0;
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for (const_iterator it = begin(); it != end() && i < N1; ++it) {
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it->as<JsonArray>().copyTo(array[i++]);
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}
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}
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#if ARDUINOJSON_ENABLE_DEPRECATED
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DEPRECATED("use remove() instead")
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FORCE_INLINE void removeAt(size_t index) {
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return remove(index);
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}
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#endif
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private:
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template <typename TValueRef>
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bool set_impl(size_t index, TValueRef value) {
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iterator it = begin() += index;
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if (it == end()) return false;
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return Internals::ValueSaver<TValueRef>::save(_buffer, *it, value);
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}
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template <typename TValueRef>
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bool add_impl(TValueRef value) {
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iterator it = Internals::List<JsonVariant>::add();
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if (it == end()) return false;
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return Internals::ValueSaver<TValueRef>::save(_buffer, *it, value);
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}
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};
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namespace Internals {
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template <>
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struct JsonVariantDefault<JsonArray> {
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static JsonArray &get() {
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return JsonArray::invalid();
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}
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};
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}
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}
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