CMake/Utilities/cmjsoncpp/include/json/value.h at master · Kitware/CMake · GitHub

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// Distributed under MIT license, or public domain if desired and

// recognized in your jurisdiction.

// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE

#ifndef JSON_VALUE_H_INCLUDED

#define JSON_VALUE_H_INCLUDED

#if !defined(JSON_IS_AMALGAMATION)

#include "forwards.h"

#endif // if !defined(JSON_IS_AMALGAMATION)

// Conditional NORETURN attribute on the throw functions would:

// a) suppress false positives from static code analysis

// b) possibly improve optimization opportunities.

#if !defined(JSONCPP_NORETURN)

#if defined(_MSC_VER) && _MSC_VER == 1800

#define JSONCPP_NORETURN __declspec(noreturn)

#else

#define JSONCPP_NORETURN [[noreturn]]

#endif

// Support for '= delete' with template declarations was a late addition

// to the c++11 standard and is rejected by clang 3.8 and Apple clang 8.2

// even though these declare themselves to be c++11 compilers.

#if !defined(JSONCPP_TEMPLATE_DELETE)

#if defined(__clang__) && defined(__apple_build_version__)

#if __apple_build_version__ <= 8000042

#define JSONCPP_TEMPLATE_DELETE

#endif

#elif defined(__clang__)

#if __clang_major__ == 3 && __clang_minor__ <= 8

#define JSONCPP_TEMPLATE_DELETE

#endif

#elif defined(__EDG__) && defined(__LCC__)

#if __LCC__ < 123

#define JSONCPP_TEMPLATE_DELETE

#endif

#if !defined(JSONCPP_TEMPLATE_DELETE)

#define JSONCPP_TEMPLATE_DELETE = delete

#endif

#include <array>

#include <exception>

#include <map>

#include <memory>

#include <string>

#include <vector>

// Disable warning C4251: <data member>: <type> needs to have dll-interface to

// be used by...

#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)

#pragma warning(push)

#pragma warning(disable : 4251 4275)

#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)

#if !defined(__SUNPRO_CC)

#pragma pack(push)

#pragma pack()

#endif

/** \brief JSON (JavaScript Object Notation).

namespace Json {

#if JSON_USE_EXCEPTION

/** Base class for all exceptions we throw.

* We use nothing but these internally. Of course, STL can throw others.

class JSON_API Exception : public std::exception {

public:

Exception(String msg);

~Exception() noexcept override;

char const* what() const noexcept override;

protected:

String msg_;

};

/** Exceptions which the user cannot easily avoid.

* E.g. out-of-memory (when we use malloc), stack-overflow, malicious input

* \remark derived from Json::Exception

class JSON_API RuntimeError : public Exception {

public:

RuntimeError(String const& msg);

};

/** Exceptions thrown by JSON_ASSERT/JSON_FAIL macros.

* These are precondition-violations (user bugs) and internal errors (our bugs).

* \remark derived from Json::Exception

class JSON_API LogicError : public Exception {

public:

LogicError(String const& msg);

};

#endif

/// used internally

JSONCPP_NORETURN void throwRuntimeError(String const& msg);

/// used internally

JSONCPP_NORETURN void throwLogicError(String const& msg);

/** \brief Type of the value held by a Value object.

enum ValueType {

nullValue = 0, ///< 'null' value

intValue, ///< signed integer value

uintValue, ///< unsigned integer value

realValue, ///< double value

stringValue, ///< UTF-8 string value

booleanValue, ///< bool value

arrayValue, ///< array value (ordered list)

objectValue ///< object value (collection of name/value pairs).

};

enum CommentPlacement {

commentBefore = 0, ///< a comment placed on the line before a value

commentAfterOnSameLine, ///< a comment just after a value on the same line

commentAfter, ///< a comment on the line after a value (only make sense for

/// root value)

numberOfCommentPlacement

};

/** \brief Type of precision for formatting of real values.

enum PrecisionType {

significantDigits = 0, ///< we set max number of significant digits in string

decimalPlaces ///< we set max number of digits after "." in string

};

/** \brief Lightweight wrapper to tag static string.

* Value constructor and objectValue member assignment takes advantage of the

* StaticString and avoid the cost of string duplication when storing the

* string or the member name.

* Example of usage:

* \code

* Json::Value aValue( StaticString("some text") );

* Json::Value object;

* static const StaticString code("code");

* object[code] = 1234;

* \endcode

class JSON_API StaticString {

public:

explicit StaticString(const char* czstring) : c_str_(czstring) {}

operator const char*() const { return c_str_; }

const char* c_str() const { return c_str_; }

private:

const char* c_str_;

};

/** \brief Represents a <a HREF="http://www.json.org">JSON</a> value.

* This class is a discriminated union wrapper that can represents a:

* - signed integer [range: Value::minInt - Value::maxInt]

* - unsigned integer (range: 0 - Value::maxUInt)

* - double

* - UTF-8 string

* - boolean

* - 'null'

* - an ordered list of Value

* - collection of name/value pairs (javascript object)

* The type of the held value is represented by a #ValueType and

* can be obtained using type().

* Values of an #objectValue or #arrayValue can be accessed using operator[]()

* methods.

* Non-const methods will automatically create the a #nullValue element

* if it does not exist.

* The sequence of an #arrayValue will be automatically resized and initialized

* with #nullValue. resize() can be used to enlarge or truncate an #arrayValue.

* The get() methods can be used to obtain default value in the case the

* required element does not exist.

* It is possible to iterate over the list of member keys of an object using

* the getMemberNames() method.

* \note #Value string-length fit in size_t, but keys must be < 2^30.

* (The reason is an implementation detail.) A #CharReader will raise an

* exception if a bound is exceeded to avoid security holes in your app,

* but the Value API does *not* check bounds. That is the responsibility

* of the caller.

class JSON_API Value {

friend class ValueIteratorBase;

public:

using Members = std::vector<String>;

using iterator = ValueIterator;

using const_iterator = ValueConstIterator;

using UInt = Json::UInt;

using Int = Json::Int;

#if defined(JSON_HAS_INT64)

using UInt64 = Json::UInt64;

using Int64 = Json::Int64;

#endif // defined(JSON_HAS_INT64)

using LargestInt = Json::LargestInt;

using LargestUInt = Json::LargestUInt;

using ArrayIndex = Json::ArrayIndex;

// Required for boost integration, e. g. BOOST_TEST

using value_type = std::string;

#if JSON_USE_NULLREF

// Binary compatibility kludges, do not use.

static const Value& null;

static const Value& nullRef;

#endif

// null and nullRef are deprecated, use this instead.

static Value const& nullSingleton();

/// Minimum signed integer value that can be stored in a Json::Value.

static constexpr LargestInt minLargestInt =

LargestInt(~(LargestUInt(-1) / 2));

/// Maximum signed integer value that can be stored in a Json::Value.

static constexpr LargestInt maxLargestInt = LargestInt(LargestUInt(-1) / 2);

/// Maximum unsigned integer value that can be stored in a Json::Value.

static constexpr LargestUInt maxLargestUInt = LargestUInt(-1);

/// Minimum signed int value that can be stored in a Json::Value.

static constexpr Int minInt = Int(~(UInt(-1) / 2));

/// Maximum signed int value that can be stored in a Json::Value.

static constexpr Int maxInt = Int(UInt(-1) / 2);

/// Maximum unsigned int value that can be stored in a Json::Value.

static constexpr UInt maxUInt = UInt(-1);

#if defined(JSON_HAS_INT64)

/// Minimum signed 64 bits int value that can be stored in a Json::Value.

static constexpr Int64 minInt64 = Int64(~(UInt64(-1) / 2));

/// Maximum signed 64 bits int value that can be stored in a Json::Value.

static constexpr Int64 maxInt64 = Int64(UInt64(-1) / 2);

/// Maximum unsigned 64 bits int value that can be stored in a Json::Value.

static constexpr UInt64 maxUInt64 = UInt64(-1);

#endif // defined(JSON_HAS_INT64)

/// Default precision for real value for string representation.

static constexpr UInt defaultRealPrecision = 17;

// The constant is hard-coded because some compiler have trouble

// converting Value::maxUInt64 to a double correctly (AIX/xlC).

// Assumes that UInt64 is a 64 bits integer.

static constexpr double maxUInt64AsDouble = 18446744073709551615.0;

// Workaround for bug in the NVIDIAs CUDA 9.1 nvcc compiler

// when using gcc and clang backend compilers. CZString

// cannot be defined as private. See issue #486

#ifdef __NVCC__

public:

#else

private:

#endif

#ifndef JSONCPP_DOC_EXCLUDE_IMPLEMENTATION

class CZString {

public:

enum DuplicationPolicy { noDuplication = 0, duplicate, duplicateOnCopy };

CZString(ArrayIndex index);

CZString(char const* str, unsigned length, DuplicationPolicy allocate);

CZString(CZString const& other);

CZString(CZString&& other) noexcept;

~CZString();

CZString& operator=(const CZString& other);

CZString& operator=(CZString&& other) noexcept;

bool operator<(CZString const& other) const;

bool operator==(CZString const& other) const;

ArrayIndex index() const;

// const char* c_str() const; ///< deprecated

char const* data() const;

unsigned length() const;

bool isStaticString() const;

private:

void swap(CZString& other);

struct StringStorage {

unsigned policy_ : 2;

unsigned length_ : 30; // 1GB max

};

char const* cstr_; // actually, a prefixed string, unless policy is noDup

union {

ArrayIndex index_;

StringStorage storage_;

};

public:

typedef std::map<CZString, Value> ObjectValues;

#endif // ifndef JSONCPP_DOC_EXCLUDE_IMPLEMENTATION

public:

/**

* \brief Create a default Value of the given type.

* This is a very useful constructor.

* To create an empty array, pass arrayValue.

* To create an empty object, pass objectValue.

* Another Value can then be set to this one by assignment.

* This is useful since clear() and resize() will not alter types.

* Examples:

* \code

* Json::Value null_value; // null

* Json::Value arr_value(Json::arrayValue); // []

* Json::Value obj_value(Json::objectValue); // {}

* \endcode

Value(ValueType type = nullValue);

Value(Int value);

Value(UInt value);

#if defined(JSON_HAS_INT64)

Value(Int64 value);

Value(UInt64 value);

#endif // if defined(JSON_HAS_INT64)

Value(double value);

Value(const char* value); ///< Copy til first 0. (NULL causes to seg-fault.)

Value(const char* begin, const char* end); ///< Copy all, incl zeroes.

/**

* \brief Constructs a value from a static string.

* Like other value string constructor but do not duplicate the string for

* internal storage. The given string must remain alive after the call to

* this constructor.

* \note This works only for null-terminated strings. (We cannot change the

* size of this class, so we have nowhere to store the length, which might be

* computed later for various operations.)

* Example of usage:

* \code

* static StaticString foo("some text");

* Json::Value aValue(foo);

* \endcode

Value(const StaticString& value);

Value(const String& value);

Value(bool value);

Value(std::nullptr_t ptr) = delete;

Value(const Value& other);

Value(Value&& other) noexcept;

~Value();

/// \note Overwrite existing comments. To preserve comments, use

/// #swapPayload().

Value& operator=(const Value& other);

Value& operator=(Value&& other) noexcept;

/// Swap everything.

void swap(Value& other);

/// Swap values but leave comments and source offsets in place.

void swapPayload(Value& other);

/// copy everything.

void copy(const Value& other);

/// copy values but leave comments and source offsets in place.

void copyPayload(const Value& other);

ValueType type() const;

/// Compare payload only, not comments etc.

bool operator<(const Value& other) const;

bool operator<=(const Value& other) const;

bool operator>=(const Value& other) const;

bool operator>(const Value& other) const;

bool operator==(const Value& other) const;

bool operator!=(const Value& other) const;

int compare(const Value& other) const;

const char* asCString() const; ///< Embedded zeroes could cause you trouble!

#if JSONCPP_USING_SECURE_MEMORY

unsigned getCStringLength() const; // Allows you to understand the length of

// the CString

#endif

String asString() const; ///< Embedded zeroes are possible.

/** Get raw char* of string-value.

* \return false if !string. (Seg-fault if str or end are NULL.)

bool getString(char const** begin, char const** end) const;

Int asInt() const;

UInt asUInt() const;

#if defined(JSON_HAS_INT64)

Int64 asInt64() const;

UInt64 asUInt64() const;

#endif // if defined(JSON_HAS_INT64)

LargestInt asLargestInt() const;

LargestUInt asLargestUInt() const;

float asFloat() const;

double asDouble() const;

bool asBool() const;

bool isNull() const;

bool isBool() const;

bool isInt() const;

bool isInt64() const;

bool isUInt() const;

bool isUInt64() const;

bool isIntegral() const;

bool isDouble() const;

bool isNumeric() const;

bool isString() const;

bool isArray() const;

bool isObject() const;

/// The `as<T>` and `is<T>` member function templates and specializations.

template <typename T> T as() const JSONCPP_TEMPLATE_DELETE;

template <typename T> bool is() const JSONCPP_TEMPLATE_DELETE;

bool isConvertibleTo(ValueType other) const;

/// Number of values in array or object

ArrayIndex size() const;

/// \brief Return true if empty array, empty object, or null;

/// otherwise, false.

bool empty() const;

/// Return !isNull()

explicit operator bool() const;

/// Remove all object members and array elements.

/// \pre type() is arrayValue, objectValue, or nullValue

/// \post type() is unchanged

void clear();

/// Resize the array to newSize elements.

/// New elements are initialized to null.

/// May only be called on nullValue or arrayValue.

/// \pre type() is arrayValue or nullValue

/// \post type() is arrayValue

void resize(ArrayIndex newSize);

///@{

/// Access an array element (zero based index). If the array contains less

/// than index element, then null value are inserted in the array so that

/// its size is index+1.

/// (You may need to say 'value[0u]' to get your compiler to distinguish

/// this from the operator[] which takes a string.)

Value& operator[](ArrayIndex index);

Value& operator[](int index);

///@}

///@{

/// Access an array element (zero based index).

/// (You may need to say 'value[0u]' to get your compiler to distinguish

/// this from the operator[] which takes a string.)

const Value& operator[](ArrayIndex index) const;

const Value& operator[](int index) const;

///@}

/// If the array contains at least index+1 elements, returns the element

/// value, otherwise returns defaultValue.

Value get(ArrayIndex index, const Value& defaultValue) const;

/// Return true if index < size().

bool isValidIndex(ArrayIndex index) const;

/// \brief Append value to array at the end.

///

/// Equivalent to jsonvalue[jsonvalue.size()] = value;

Value& append(const Value& value);

Value& append(Value&& value);

/// \brief Insert value in array at specific index

bool insert(ArrayIndex index, const Value& newValue);

bool insert(ArrayIndex index, Value&& newValue);

/// Access an object value by name, create a null member if it does not exist.

/// \note Because of our implementation, keys are limited to 2^30 -1 chars.

/// Exceeding that will cause an exception.

Value& operator[](const char* key);

/// Access an object value by name, returns null if there is no member with

/// that name.

const Value& operator[](const char* key) const;

/// Access an object value by name, create a null member if it does not exist.

/// \param key may contain embedded nulls.

Value& operator[](const String& key);

/// Access an object value by name, returns null if there is no member with

/// that name.

/// \param key may contain embedded nulls.

const Value& operator[](const String& key) const;

/** \brief Access an object value by name, create a null member if it does not

* exist.

* If the object has no entry for that name, then the member name used to

* store the new entry is not duplicated.

* Example of use:

* \code

* Json::Value object;

* static const StaticString code("code");

* object[code] = 1234;

* \endcode

Value& operator[](const StaticString& key);

/// Return the member named key if it exist, defaultValue otherwise.

/// \note deep copy

Value get(const char* key, const Value& defaultValue) const;

/// Return the member named key if it exist, defaultValue otherwise.

/// \note deep copy

/// \note key may contain embedded nulls.

Value get(const char* begin, const char* end,

const Value& defaultValue) const;

/// Return the member named key if it exist, defaultValue otherwise.

/// \note deep copy

/// \param key may contain embedded nulls.

Value get(const String& key, const Value& defaultValue) const;

/// Most general and efficient version of isMember()const, get()const,

/// and operator[]const

/// \note As stated elsewhere, behavior is undefined if (end-begin) >= 2^30

Value const* find(char const* begin, char const* end) const;

/// Most general and efficient version of isMember()const, get()const,

/// and operator[]const

Value const* find(const String& key) const;

/// Most general and efficient version of object-mutators.

/// \note As stated elsewhere, behavior is undefined if (end-begin) >= 2^30

/// \return non-zero, but JSON_ASSERT if this is neither object nor nullValue.

Value* demand(char const* begin, char const* end);

/// \brief Remove and return the named member.

///

/// Do nothing if it did not exist.

/// \pre type() is objectValue or nullValue

/// \post type() is unchanged

void removeMember(const char* key);

/// Same as removeMember(const char*)

/// \param key may contain embedded nulls.

void removeMember(const String& key);

/// Same as removeMember(const char* begin, const char* end, Value* removed),

/// but 'key' is null-terminated.

bool removeMember(const char* key, Value* removed);

/** \brief Remove the named map member.

* Update 'removed' iff removed.

* \param key may contain embedded nulls.

* \return true iff removed (no exceptions)

bool removeMember(String const& key, Value* removed);

/// Same as removeMember(String const& key, Value* removed)

bool removeMember(const char* begin, const char* end, Value* removed);

/** \brief Remove the indexed array element.

* O(n) expensive operations.

* Update 'removed' iff removed.

* \return true if removed (no exceptions)

bool removeIndex(ArrayIndex index, Value* removed);

/// Return true if the object has a member named key.

/// \note 'key' must be null-terminated.

bool isMember(const char* key) const;

/// Return true if the object has a member named key.

/// \param key may contain embedded nulls.

bool isMember(const String& key) const;

/// Same as isMember(String const& key)const

bool isMember(const char* begin, const char* end) const;

/// \brief Return a list of the member names.

///

/// If null, return an empty list.

/// \pre type() is objectValue or nullValue

/// \post if type() was nullValue, it remains nullValue

Members getMemberNames() const;

/// deprecated Always pass len.

JSONCPP_DEPRECATED("Use setComment(String const&) instead.")

void setComment(const char* comment, CommentPlacement placement) {

setComment(String(comment, strlen(comment)), placement);

}

/// Comments must be //... or /* ... */

void setComment(const char* comment, size_t len, CommentPlacement placement) {

setComment(String(comment, len), placement);

}

/// Comments must be //... or /* ... */

void setComment(String comment, CommentPlacement placement);

bool hasComment(CommentPlacement placement) const;

/// Include delimiters and embedded newlines.

String getComment(CommentPlacement placement) const;

String toStyledString() const;

const_iterator begin() const;

const_iterator end() const;

iterator begin();

iterator end();

/// \brief Returns a reference to the first element in the `Value`.

/// Requires that this value holds an array or json object, with at least one

/// element.

const Value& front() const;

/// \brief Returns a reference to the first element in the `Value`.

/// Requires that this value holds an array or json object, with at least one

/// element.

Value& front();

/// \brief Returns a reference to the last element in the `Value`.

/// Requires that value holds an array or json object, with at least one

/// element.

const Value& back() const;

/// \brief Returns a reference to the last element in the `Value`.

/// Requires that this value holds an array or json object, with at least one

/// element.

Value& back();

// Accessors for the [start, limit) range of bytes within the JSON text from

// which this value was parsed, if any.

void setOffsetStart(ptrdiff_t start);

void setOffsetLimit(ptrdiff_t limit);

ptrdiff_t getOffsetStart() const;

ptrdiff_t getOffsetLimit() const;

private:

void setType(ValueType v) {

bits_.value_type_ = static_cast<unsigned char>(v);

}

bool isAllocated() const { return bits_.allocated_; }

void setIsAllocated(bool v) { bits_.allocated_ = v; }

void initBasic(ValueType type, bool allocated = false);

void dupPayload(const Value& other);

void releasePayload();

void dupMeta(const Value& other);

Value& resolveReference(const char* key);

Value& resolveReference(const char* key, const char* end);

// struct MemberNamesTransform

//{

// typedef const char *result_type;

// const char *operator()( const CZString &name ) const

// {

// return name.c_str();

// }

//};

union ValueHolder {

LargestInt int_;

LargestUInt uint_;

double real_;

bool bool_;

char* string_; // if allocated_, ptr to { unsigned, char[] }.

ObjectValues* map_;

} value_;

struct {

// Really a ValueType, but types should agree for bitfield packing.

unsigned int value_type_ : 8;

// Unless allocated_, string_ must be null-terminated.

unsigned int allocated_ : 1;

} bits_;

class Comments {

public:

Comments() = default;

Comments(const Comments& that);

Comments(Comments&& that) noexcept;

Comments& operator=(const Comments& that);

Comments& operator=(Comments&& that) noexcept;

bool has(CommentPlacement slot) const;

String get(CommentPlacement slot) const;

void set(CommentPlacement slot, String comment);

private:

using Array = std::array<String, numberOfCommentPlacement>;

std::unique_ptr<Array> ptr_;

};

Comments comments_;

// [start, limit) byte offsets in the source JSON text from which this Value

// was extracted.

ptrdiff_t start_;

ptrdiff_t limit_;

};

template <> inline bool Value::as<bool>() const { return asBool(); }

template <> inline bool Value::is<bool>() const { return isBool(); }

template <> inline Int Value::as<Int>() const { return asInt(); }

template <> inline bool Value::is<Int>() const { return isInt(); }

template <> inline UInt Value::as<UInt>() const { return asUInt(); }

template <> inline bool Value::is<UInt>() const { return isUInt(); }

#if defined(JSON_HAS_INT64)

template <> inline Int64 Value::as<Int64>() const { return asInt64(); }

template <> inline bool Value::is<Int64>() const { return isInt64(); }

template <> inline UInt64 Value::as<UInt64>() const { return asUInt64(); }

template <> inline bool Value::is<UInt64>() const { return isUInt64(); }

#endif

template <> inline double Value::as<double>() const { return asDouble(); }

template <> inline bool Value::is<double>() const { return isDouble(); }

template <> inline String Value::as<String>() const { return asString(); }

template <> inline bool Value::is<String>() const { return isString(); }

/// These `as` specializations are type conversions, and do not have a

/// corresponding `is`.

template <> inline float Value::as<float>() const { return asFloat(); }

template <> inline const char* Value::as<const char*>() const {

return asCString();

}

/** \brief Experimental and untested: represents an element of the "path" to

* access a node.

class JSON_API PathArgument {

public:

friend class Path;

PathArgument();

PathArgument(ArrayIndex index);

PathArgument(const char* key);

PathArgument(String key);

private:

enum Kind { kindNone = 0, kindIndex, kindKey };

String key_;

ArrayIndex index_{};

Kind kind_{kindNone};

};

/** \brief Experimental and untested: represents a "path" to access a node.

* Syntax:

* - "." => root node

* - ".[n]" => elements at index 'n' of root node (an array value)

* - ".name" => member named 'name' of root node (an object value)

* - ".name1.name2.name3"

* - ".[0][1][2].name1[3]"

* - ".%" => member name is provided as parameter

* - ".[%]" => index is provided as parameter

class JSON_API Path {

public:

Path(const String& path, const PathArgument& a1 = PathArgument(),

const PathArgument& a2 = PathArgument(),

const PathArgument& a3 = PathArgument(),

const PathArgument& a4 = PathArgument(),

const PathArgument& a5 = PathArgument());

const Value& resolve(const Value& root) const;

Value resolve(const Value& root, const Value& defaultValue) const;

/// Creates the "path" to access the specified node and returns a reference on

/// the node.

Value& make(Value& root) const;

private:

using InArgs = std::vector<const PathArgument*>;

using Args = std::vector<PathArgument>;

void makePath(const String& path, const InArgs& in);

void addPathInArg(const String& path, const InArgs& in,

InArgs::const_iterator& itInArg, PathArgument::Kind kind);

static void invalidPath(const String& path, int location);

Args args_;

};

/** \brief base class for Value iterators.

class JSON_API ValueIteratorBase {

public:

using iterator_category = std::bidirectional_iterator_tag;

using size_t = unsigned int;

using difference_type = int;

using SelfType = ValueIteratorBase;

bool operator==(const SelfType& other) const { return isEqual(other); }

bool operator!=(const SelfType& other) const { return !isEqual(other); }

difference_type operator-(const SelfType& other) const {

return other.computeDistance(*this);

}

/// Return either the index or the member name of the referenced value as a

/// Value.

Value key() const;

/// Return the index of the referenced Value, or -1 if it is not an

/// arrayValue.

UInt index() const;

/// Return the member name of the referenced Value, or "" if it is not an

/// objectValue.

/// \note Avoid `c_str()` on result, as embedded zeroes are possible.

String name() const;

/// Return the member name of the referenced Value. "" if it is not an

/// objectValue.

/// deprecated This cannot be used for UTF-8 strings, since there can be

/// embedded nulls.

JSONCPP_DEPRECATED("Use `key = name();` instead.")

char const* memberName() const;

/// Return the member name of the referenced Value, or NULL if it is not an

/// objectValue.

/// \note Better version than memberName(). Allows embedded nulls.

char const* memberName(char const** end) const;

protected:

/*! Internal utility functions to assist with implementing

* other iterator functions. The const and non-const versions

* of the "deref" protected methods expose the protected

* current_ member variable in a way that can often be

* optimized away by the compiler.

const Value& deref() const;

Value& deref();

void increment();

void decrement();

difference_type computeDistance(const SelfType& other) const;

bool isEqual(const SelfType& other) const;

void copy(const SelfType& other);

private:

Value::ObjectValues::iterator current_;

// Indicates that iterator is for a null value.

bool isNull_{true};

public:

// For some reason, BORLAND needs these at the end, rather

// than earlier. No idea why.

ValueIteratorBase();

explicit ValueIteratorBase(const Value::ObjectValues::iterator& current);

};

/** \brief const iterator for object and array value.

class JSON_API ValueConstIterator : public ValueIteratorBase {

friend class Value;

public:

using value_type = const Value;

// typedef unsigned int size_t;

// typedef int difference_type;

using reference = const Value&;

using pointer = const Value*;

using SelfType = ValueConstIterator;

ValueConstIterator();

ValueConstIterator(ValueIterator const& other);

private:

/*! internal Use by Value to create an iterator.

explicit ValueConstIterator(const Value::ObjectValues::iterator& current);

public:

SelfType& operator=(const ValueIteratorBase& other);

SelfType operator++(int) {

SelfType temp(*this);

++*this;

return temp;

}

SelfType operator--(int) {

SelfType temp(*this);

--*this;

return temp;

}

SelfType& operator--() {

decrement();

return *this;

}

SelfType& operator++() {

increment();

return *this;

}

reference operator*() const { return deref(); }

pointer operator->() const { return &deref(); }

};

/** \brief Iterator for object and array value.

class JSON_API ValueIterator : public ValueIteratorBase {

friend class Value;

public:

using value_type = Value;

using size_t = unsigned int;

using difference_type = int;

using reference = Value&;

using pointer = Value*;

using SelfType = ValueIterator;

ValueIterator();

explicit ValueIterator(const ValueConstIterator& other);

ValueIterator(const ValueIterator& other);

private:

/*! internal Use by Value to create an iterator.

explicit ValueIterator(const Value::ObjectValues::iterator& current);

public:

SelfType& operator=(const SelfType& other);

SelfType operator++(int) {

SelfType temp(*this);

++*this;

return temp;

}

SelfType operator--(int) {

SelfType temp(*this);

--*this;

return temp;

}

SelfType& operator--() {

decrement();

return *this;

}

SelfType& operator++() {

increment();

return *this;

}

/*! The return value of non-const iterators can be

* changed, so the these functions are not const

* because the returned references/pointers can be used

* to change state of the base class.

reference operator*() const { return const_cast<reference>(deref()); }

pointer operator->() const { return const_cast<pointer>(&deref()); }

};

inline void swap(Value& a, Value& b) { a.swap(b); }

inline const Value& Value::front() const { return *begin(); }

inline Value& Value::front() { return *begin(); }

inline const Value& Value::back() const { return *(--end()); }

inline Value& Value::back() { return *(--end()); }

} // namespace Json

#if !defined(__SUNPRO_CC)

#pragma pack(pop)

#endif

#if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)

#pragma warning(pop)

#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)

#endif // JSON_H_INCLUDED

CMake/Utilities/cmjsoncpp/include/json/value.h at master · Kitware/CMake · GitHub

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