games/devtest/mods/testformspec/callbacks.lua


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local callback_test = 0

local out = function(player, formname, fields, number)
	local snum = ""
	if number then
		snum = " "..number
	end
	local msg = "Formspec callback"..snum..": player="..player:get_player_name()..", formname=\""..tostring(formname).."\", fields="..dump(fields)
	minetest.chat_send_player(player:get_player_name(), msg)
	minetest.log("action", msg)
end

minetest.register_on_player_receive_fields(function(player, formname, fields)
	if callback_test == 1 then
		out(player, formname, fields)
	elseif callback_test == 2 then
		out(player, formname, fields, 1)
	end
end)
minetest.register_on_player_receive_fields(function(player, formname, fields)
	if callback_test == 2 then
		out(player, formname, fields, 2)
		return true -- Disable the first callback
	end
end)
minetest.register_on_player_receive_fields(function(player, formname, fields)
	if callback_test == 2 then
		out(player, formname, fields, 3)
	end
end)

minetest.register_chatcommand("test_formspec_callbacks", {
	params = "[ 0 | 1 | 2 ]",
	description = "Test: Change formspec callbacks testing mode",
	func = function(name, param)
		local mode = tonumber(param)
		if not mode then
			callback_test = (callback_test + 1 % 3)
		else
			callback_test = mode
		end
		if callback_test == 1 then
			minetest.chat_send_player(name, "Formspec callback test mode 1 enabled: Logging only")
		elseif callback_test == 2 then
			minetest.chat_send_player(name, "Formspec callback test mode 2 enabled: Three callbacks, disable pre-registered callbacks")
		else
			callback_test = 0
			minetest.chat_send_player(name, "Formspec callback test disabled!")
		end
	end
})
/// Json-cpp amalgamated header (http://jsoncpp.sourceforge.net/).
/// It is intended to be used with #include "json/json.h"

// //////////////////////////////////////////////////////////////////////
// Beginning of content of file: LICENSE
// //////////////////////////////////////////////////////////////////////

/*
The JsonCpp library's source code, including accompanying documentation, 
tests and demonstration applications, are licensed under the following
conditions...

Baptiste Lepilleur and The JsonCpp Authors explicitly disclaim copyright in all 
jurisdictions which recognize such a disclaimer. In such jurisdictions, 
this software is released into the Public Domain.

In jurisdictions which do not recognize Public Domain property (e.g. Germany as of
2010), this software is Copyright (c) 2007-2010 by Baptiste Lepilleur and
The JsonCpp Authors, and is released under the terms of the MIT License (see below).

In jurisdictions which recognize Public Domain property, the user of this 
software may choose to accept it either as 1) Public Domain, 2) under the 
conditions of the MIT License (see below), or 3) under the terms of dual 
Public Domain/MIT License conditions described here, as they choose.

The MIT License is about as close to Public Domain as a license can get, and is
described in clear, concise terms at:

   http://en.wikipedia.org/wiki/MIT_License
   
The full text of the MIT License follows:

========================================================================
Copyright (c) 2007-2010 Baptiste Lepilleur and The JsonCpp Authors

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
========================================================================
(END LICENSE TEXT)

The MIT license is compatible with both the GPL and commercial
software, affording one all of the rights of Public Domain with the
minor nuisance of being required to keep the above copyright notice
and license text in the source code. Note also that by accepting the
Public Domain "license" you can re-license your copy using whatever
license you like.

*/

// //////////////////////////////////////////////////////////////////////
// End of content of file: LICENSE
// //////////////////////////////////////////////////////////////////////


#ifndef JSON_AMALGAMATED_H_INCLUDED
# define JSON_AMALGAMATED_H_INCLUDED
/// If defined, indicates that the source file is amalgamated
/// to prevent private header inclusion.
#define JSON_IS_AMALGAMATION

// //////////////////////////////////////////////////////////////////////
// Beginning of content of file: include/json/version.h
// //////////////////////////////////////////////////////////////////////

// DO NOT EDIT. This file (and "version") is generated by CMake.
// Run CMake configure step to update it.
#ifndef JSON_VERSION_H_INCLUDED
# define JSON_VERSION_H_INCLUDED

# define JSONCPP_VERSION_STRING "1.8.4"
# define JSONCPP_VERSION_MAJOR 1
# define JSONCPP_VERSION_MINOR 8
# define JSONCPP_VERSION_PATCH 4
# define JSONCPP_VERSION_QUALIFIER
# define JSONCPP_VERSION_HEXA ((JSONCPP_VERSION_MAJOR << 24) | (JSONCPP_VERSION_MINOR << 16) | (JSONCPP_VERSION_PATCH << 8))

#ifdef JSONCPP_USING_SECURE_MEMORY
#undef JSONCPP_USING_SECURE_MEMORY
#endif
#define JSONCPP_USING_SECURE_MEMORY 0
// If non-zero, the library zeroes any memory that it has allocated before
// it frees its memory.

#endif // JSON_VERSION_H_INCLUDED

// //////////////////////////////////////////////////////////////////////
// End of content of file: include/json/version.h
// //////////////////////////////////////////////////////////////////////


// //////////////////////////////////////////////////////////////////////
// Beginning of content of file: include/json/config.h
// //////////////////////////////////////////////////////////////////////

// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
// 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_CONFIG_H_INCLUDED
#define JSON_CONFIG_H_INCLUDED
#include <stddef.h>
#include <string> //typedef String
#include <stdint.h> //typedef int64_t, uint64_t

/// If defined, indicates that json library is embedded in CppTL library.
//# define JSON_IN_CPPTL 1

/// If defined, indicates that json may leverage CppTL library
//#  define JSON_USE_CPPTL 1
/// If defined, indicates that cpptl vector based map should be used instead of
/// std::map
/// as Value container.
//#  define JSON_USE_CPPTL_SMALLMAP 1

// If non-zero, the library uses exceptions to report bad input instead of C
// assertion macros. The default is to use exceptions.
#ifndef JSON_USE_EXCEPTION
#define JSON_USE_EXCEPTION 1
#endif

/// If defined, indicates that the source file is amalgamated
/// to prevent private header inclusion.
/// Remarks: it is automatically defined in the generated amalgamated header.
// #define JSON_IS_AMALGAMATION

#ifdef JSON_IN_CPPTL
#include <cpptl/config.h>
#ifndef JSON_USE_CPPTL
#define JSON_USE_CPPTL 1
#endif
#endif

#ifdef JSON_IN_CPPTL
#define JSON_API CPPTL_API
#elif defined(JSON_DLL_BUILD)
#if defined(_MSC_VER) || defined(__MINGW32__)
#define JSON_API __declspec(dllexport)
#define JSONCPP_DISABLE_DLL_INTERFACE_WARNING
#endif // if defined(_MSC_VER)
#elif defined(JSON_DLL)
#if defined(_MSC_VER) || defined(__MINGW32__)
#define JSON_API __declspec(dllimport)
#define JSONCPP_DISABLE_DLL_INTERFACE_WARNING
#endif // if defined(_MSC_VER)
#endif // ifdef JSON_IN_CPPTL
#if !defined(JSON_API)
#define JSON_API
#endif

// If JSON_NO_INT64 is defined, then Json only support C++ "int" type for
// integer
// Storages, and 64 bits integer support is disabled.
// #define JSON_NO_INT64 1

#if defined(_MSC_VER) // MSVC
#  if _MSC_VER <= 1200 // MSVC 6
    // Microsoft Visual Studio 6 only support conversion from __int64 to double
    // (no conversion from unsigned __int64).
#    define JSON_USE_INT64_DOUBLE_CONVERSION 1
    // Disable warning 4786 for VS6 caused by STL (identifier was truncated to '255'
    // characters in the debug information)
    // All projects I've ever seen with VS6 were using this globally (not bothering
    // with pragma push/pop).
#    pragma warning(disable : 4786)
#  endif // MSVC 6

#  if _MSC_VER >= 1500 // MSVC 2008
    /// Indicates that the following function is deprecated.
#    define JSONCPP_DEPRECATED(message) __declspec(deprecated(message))
#  endif

#endif // defined(_MSC_VER)

// In c++11 the override keyword allows you to explicitly define that a function
// is intended to override the base-class version.  This makes the code more
// managable and fixes a set of common hard-to-find bugs.
#if __cplusplus >= 201103L
# define JSONCPP_OVERRIDE override
# define JSONCPP_NOEXCEPT noexcept
#elif defined(_MSC_VER) && _MSC_VER > 1600 && _MSC_VER < 1900
# define JSONCPP_OVERRIDE override
# define JSONCPP_NOEXCEPT throw()
#elif defined(_MSC_VER) && _MSC_VER >= 1900
# define JSONCPP_OVERRIDE override
# define JSONCPP_NOEXCEPT noexcept
#else
# define JSONCPP_OVERRIDE
# define JSONCPP_NOEXCEPT throw()
#endif

#ifndef JSON_HAS_RVALUE_REFERENCES

#if defined(_MSC_VER) && _MSC_VER >= 1600 // MSVC >= 2010
#define JSON_HAS_RVALUE_REFERENCES 1
#endif // MSVC >= 2010

#ifdef __clang__
#if __has_feature(cxx_rvalue_references)
#define JSON_HAS_RVALUE_REFERENCES 1
#endif  // has_feature

#elif defined __GNUC__ // not clang (gcc comes later since clang emulates gcc)
#if defined(__GXX_EXPERIMENTAL_CXX0X__) || (__cplusplus >= 201103L)
#define JSON_HAS_RVALUE_REFERENCES 1
#endif  // GXX_EXPERIMENTAL

#endif // __clang__ || __GNUC__

#endif // not defined JSON_HAS_RVALUE_REFERENCES

#ifndef JSON_HAS_RVALUE_REFERENCES
#define JSON_HAS_RVALUE_REFERENCES 0
#endif

#ifdef __clang__
#  if __has_extension(attribute_deprecated_with_message)
#    define JSONCPP_DEPRECATED(message)  __attribute__ ((deprecated(message)))
#  endif
#elif defined __GNUC__ // not clang (gcc comes later since clang emulates gcc)
#  if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
#    define JSONCPP_DEPRECATED(message)  __attribute__ ((deprecated(message)))
#  elif (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
#    define JSONCPP_DEPRECATED(message)  __attribute__((__deprecated__))
#  endif  // GNUC version
#endif // __clang__ || __GNUC__

#if !defined(JSONCPP_DEPRECATED)
#define JSONCPP_DEPRECATED(message)
#endif // if !defined(JSONCPP_DEPRECATED)

#if __GNUC__ >= 6
#  define JSON_USE_INT64_DOUBLE_CONVERSION 1
#endif

#if !defined(JSON_IS_AMALGAMATION)

# include "version.h"

# if JSONCPP_USING_SECURE_MEMORY
#  include "allocator.h" //typedef Allocator
# endif

#endif // if !defined(JSON_IS_AMALGAMATION)

namespace Json {
typedef int Int;
typedef unsigned int UInt;
#if defined(JSON_NO_INT64)
typedef int LargestInt;
typedef unsigned int LargestUInt;
#undef JSON_HAS_INT64
#else                 // if defined(JSON_NO_INT64)
// For Microsoft Visual use specific types as long long is not supported
#if defined(_MSC_VER) // Microsoft Visual Studio
typedef __int64 Int64;
typedef unsigned __int64 UInt64;
#else                 // if defined(_MSC_VER) // Other platforms, use long long
typedef int64_t Int64;
typedef uint64_t UInt64;
#endif // if defined(_MSC_VER)
typedef Int64 LargestInt;
typedef UInt64 LargestUInt;
#define JSON_HAS_INT64
#endif // if defined(JSON_NO_INT64)
#if JSONCPP_USING_SECURE_MEMORY
#define JSONCPP_STRING        std::basic_string<char, std::char_traits<char>, Json::SecureAllocator<char> >
#define JSONCPP_OSTRINGSTREAM std::basic_ostringstream<char, std::char_traits<char>, Json::SecureAllocator<char> >
#define JSONCPP_OSTREAM       std::basic_ostream<char, std::char_traits<char>>
#define JSONCPP_ISTRINGSTREAM std::basic_istringstream<char, std::char_traits<char>, Json::SecureAllocator<char> >
#define JSONCPP_ISTREAM       std::istream
#else
#define JSONCPP_STRING        std::string
#define JSONCPP_OSTRINGSTREAM std::ostringstream
#define JSONCPP_OSTREAM       std::ostream
#define JSONCPP_ISTRINGSTREAM std::istringstream
#define JSONCPP_ISTREAM       std::istream
#endif // if JSONCPP_USING_SECURE_MEMORY
} // end namespace Json

#endif // JSON_CONFIG_H_INCLUDED

// //////////////////////////////////////////////////////////////////////
// End of content of file: include/json/config.h
// //////////////////////////////////////////////////////////////////////


// //////////////////////////////////////////////////////////////////////
// Beginning of content of file: include/json/forwards.h
// //////////////////////////////////////////////////////////////////////

// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
// 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_FORWARDS_H_INCLUDED
#define JSON_FORWARDS_H_INCLUDED

#if !defined(JSON_IS_AMALGAMATION)
#include "config.h"
#endif // if !defined(JSON_IS_AMALGAMATION)

namespace Json {

// writer.h
class FastWriter;
class StyledWriter;

// reader.h
class Reader;

// features.h
class Features;

// value.h
typedef unsigned int ArrayIndex;
class StaticString;
class Path;
class PathArgument;
class Value;
class ValueIteratorBase;
class ValueIterator;
class ValueConstIterator;

} // namespace Json

#endif // JSON_FORWARDS_H_INCLUDED

// //////////////////////////////////////////////////////////////////////
// End of content of file: include/json/forwards.h
// //////////////////////////////////////////////////////////////////////


// //////////////////////////////////////////////////////////////////////
// Beginning of content of file: include/json/features.h
// //////////////////////////////////////////////////////////////////////

// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
// 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 CPPTL_JSON_FEATURES_H_INCLUDED
#define CPPTL_JSON_FEATURES_H_INCLUDED

#if !defined(JSON_IS_AMALGAMATION)
#include "forwards.h"
#endif // if !defined(JSON_IS_AMALGAMATION)

#pragma pack(push, 8)

namespace Json {

/** \brief Configuration passed to reader and writer.
 * This configuration object can be used to force the Reader or Writer
 * to behave in a standard conforming way.
 */
class JSON_API Features {
public:
  /** \brief A configuration that allows all features and assumes all strings
   * are UTF-8.
   * - C & C++ comments are allowed
   * - Root object can be any JSON value
   * - Assumes Value strings are encoded in UTF-8
   */
  static Features all();

  /** \brief A configuration that is strictly compatible with the JSON
   * specification.
   * - Comments are forbidden.
   * - Root object must be either an array or an object value.
   * - Assumes Value strings are encoded in UTF-8
   */
  static Features strictMode();

  /** \brief Initialize the configuration like JsonConfig::allFeatures;
   */
  Features();

  /// \c true if comments are allowed. Default: \c true.
  bool allowComments_;

  /// \c true if root must be either an array or an object value. Default: \c
  /// false.
  bool strictRoot_;

  /// \c true if dropped null placeholders are allowed. Default: \c false.
  bool allowDroppedNullPlaceholders_;

  /// \c true if numeric object key are allowed. Default: \c false.
  bool allowNumericKeys_;
};

} // namespace Json

#pragma pack(pop)

#endif // CPPTL_JSON_FEATURES_H_INCLUDED

// //////////////////////////////////////////////////////////////////////
// End of content of file: include/json/features.h
// //////////////////////////////////////////////////////////////////////


// //////////////////////////////////////////////////////////////////////
// Beginning of content of file: include/json/value.h
// //////////////////////////////////////////////////////////////////////

// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
// 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 CPPTL_JSON_H_INCLUDED
#define CPPTL_JSON_H_INCLUDED

#if !defined(JSON_IS_AMALGAMATION)
#include "forwards.h"
#endif // if !defined(JSON_IS_AMALGAMATION)
#include <string>
#include <vector>
#include <exception>

#ifndef JSON_USE_CPPTL_SMALLMAP
#include <map>
#else
#include <cpptl/smallmap.h>
#endif
#ifdef JSON_USE_CPPTL
#include <cpptl/forwards.h>
#endif

//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)
#    define JSONCPP_NORETURN __declspec(noreturn)
#  elif defined(__GNUC__)
#    define JSONCPP_NORETURN __attribute__ ((__noreturn__))
#  else
#    define JSONCPP_NORETURN
#  endif
#endif

// 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)
#endif // if defined(JSONCPP_DISABLE_DLL_INTERFACE_WARNING)

#pragma pack(push, 8)

/** \brief JSON (JavaScript Object Notation).
 */
namespace Json {

/** 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(JSONCPP_STRING const& msg);
  ~Exception() JSONCPP_NOEXCEPT JSONCPP_OVERRIDE;
  char const* what() const JSONCPP_NOEXCEPT JSONCPP_OVERRIDE;
protected:
  JSONCPP_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(JSONCPP_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(JSONCPP_STRING const& msg);
};

/// used internally
JSONCPP_NORETURN void throwRuntimeError(JSONCPP_STRING const& msg);
/// used internally
JSONCPP_NORETURN void throwLogicError(JSONCPP_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
};

//# ifdef JSON_USE_CPPTL
//   typedef CppTL::AnyEnumerator<const char *> EnumMemberNames;
//   typedef CppTL::AnyEnumerator<const Value &> EnumValues;
//# endif

/** \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 a #objectValue values 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:
  typedef std::vector<JSONCPP_STRING> Members;
  typedef ValueIterator iterator;
  typedef ValueConstIterator const_iterator;
  typedef Json::UInt UInt;
  typedef Json::Int Int;
#if defined(JSON_HAS_INT64)
  typedef Json::UInt64 UInt64;
  typedef Json::Int64 Int64;
#endif // defined(JSON_HAS_INT64)
  typedef Json::LargestInt LargestInt;
  typedef Json::LargestUInt LargestUInt;
  typedef Json::ArrayIndex ArrayIndex;

  // Required for boost integration, e. g. BOOST_TEST
  typedef std::string value_type;

  static const Value& null;  ///< We regret this reference to a global instance; prefer the simpler Value().
  static const Value& nullRef;  ///< just a kludge for binary-compatibility; same as null
  static Value const& nullSingleton(); ///< Prefer this to null or nullRef.

  /// Minimum signed integer value that can be stored in a Json::Value.
  static const LargestInt minLargestInt;
  /// Maximum signed integer value that can be stored in a Json::Value.
  static const LargestInt maxLargestInt;
  /// Maximum unsigned integer value that can be stored in a Json::Value.
  static const LargestUInt maxLargestUInt;

  /// Minimum signed int value that can be stored in a Json::Value.
  static const Int minInt;
  /// Maximum signed int value that can be stored in a Json::Value.
  static const Int maxInt;
  /// Maximum unsigned int value that can be stored in a Json::Value.
  static const UInt maxUInt;

#if defined(JSON_HAS_INT64)
  /// Minimum signed 64 bits int value that can be stored in a Json::Value.
  static const Int64 minInt64;
  /// Maximum signed 64 bits int value that can be stored in a Json::Value.
  static const Int64 maxInt64;
  /// Maximum unsigned 64 bits int value that can be stored in a Json::Value.
  static const UInt64 maxUInt64;
#endif // defined(JSON_HAS_INT64)

private:
#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);
#if JSON_HAS_RVALUE_REFERENCES
    CZString(CZString&& other);
#endif
    ~CZString();
    CZString& operator=(const CZString& other);

#if JSON_HAS_RVALUE_REFERENCES
    CZString& operator=(CZString&& other);
#endif

    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:
#ifndef JSON_USE_CPPTL_SMALLMAP
  typedef std::map<CZString, Value> ObjectValues;
#else
  typedef CppTL::SmallMap<CZString, Value> ObjectValues;
#endif // ifndef JSON_USE_CPPTL_SMALLMAP
#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 JSONCPP_STRING& value); ///< Copy data() til size(). Embedded zeroes too.
#ifdef JSON_USE_CPPTL
  Value(const CppTL::ConstString& value);
#endif
  Value(bool value);
  /// Deep copy.
  Value(const Value& other);
#if JSON_HAS_RVALUE_REFERENCES
  /// Move constructor
  Value(Value&& other);
#endif
  ~Value();

  /// Deep copy, then swap(other).
  /// \note Over-write existing comments. To preserve comments, use #swapPayload().
  Value& operator=(Value other);

  /// 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
  JSONCPP_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;
#ifdef JSON_USE_CPPTL
  CppTL::ConstString asConstString() const;
#endif
  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;

  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 size 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 size);

  /// 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);

  /// 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[](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;

  /// 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[](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);

#if JSON_HAS_RVALUE_REFERENCES
  Value& append(Value&& value);
#endif

  /// 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 JSONCPP_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 JSONCPP_STRING& key) const;
  /** \brief Access an object value by name, create a null member if it does not
   exist.