2 * Copyright 2017 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 #include <boost/iterator/iterator_adaptor.hpp>
21 #include <boost/iterator/iterator_facade.hpp>
22 #include <folly/Likely.h>
23 #include <folly/Conv.h>
24 #include <folly/Format.h>
26 //////////////////////////////////////////////////////////////////////
31 struct hash< ::folly::dynamic> {
32 size_t operator()(::folly::dynamic const& d) const {
39 //////////////////////////////////////////////////////////////////////
41 // This is a higher-order preprocessor macro to aid going from runtime
42 // types to the compile time type system.
43 #define FB_DYNAMIC_APPLY(type, apply) \
73 //////////////////////////////////////////////////////////////////////
77 struct TypeError : std::runtime_error {
78 explicit TypeError(const std::string& expected, dynamic::Type actual);
79 explicit TypeError(const std::string& expected,
80 dynamic::Type actual1, dynamic::Type actual2);
85 //////////////////////////////////////////////////////////////////////
89 // This helper is used in destroy() to be able to run destructors on
90 // types like "int64_t" without a compiler error.
92 template<class T> static void destroy(T* t) { t->~T(); }
96 * Helper for implementing numeric conversions in operators on
97 * numbers. Just promotes to double when one of the arguments is
98 * double, or throws if either is not a numeric type.
100 template<template<class> class Op>
101 dynamic numericOp(dynamic const& a, dynamic const& b) {
102 if (!a.isNumber() || !b.isNumber()) {
103 throw TypeError("numeric", a.type(), b.type());
105 if (a.type() != b.type()) {
106 auto& integ = a.isInt() ? a : b;
107 auto& nonint = a.isInt() ? b : a;
108 return Op<double>()(to<double>(integ.asInt()), nonint.asDouble());
111 return Op<double>()(a.asDouble(), b.asDouble());
113 return Op<int64_t>()(a.asInt(), b.asInt());
118 //////////////////////////////////////////////////////////////////////
121 * We're doing this instead of a simple member typedef to avoid the
122 * undefined behavior of parameterizing std::unordered_map<> with an
125 * Note: Later we may add separate order tracking here (a multi-index
128 struct dynamic::ObjectImpl : std::unordered_map<dynamic, dynamic> {};
130 //////////////////////////////////////////////////////////////////////
132 // Helper object for creating objects conveniently. See object and
133 // the dynamic::dynamic(ObjectMaker&&) ctor.
134 struct dynamic::ObjectMaker {
135 friend struct dynamic;
137 explicit ObjectMaker() : val_(dynamic::object) {}
138 explicit ObjectMaker(dynamic key, dynamic val)
139 : val_(dynamic::object)
141 val_.insert(std::move(key), std::move(val));
144 // Make sure no one tries to save one of these into an lvalue with
145 // auto or anything like that.
146 ObjectMaker(ObjectMaker&&) = default;
147 ObjectMaker(ObjectMaker const&) = delete;
148 ObjectMaker& operator=(ObjectMaker const&) = delete;
149 ObjectMaker& operator=(ObjectMaker&&) = delete;
151 // This returns an rvalue-reference instead of an lvalue-reference
152 // to allow constructs like this to moved instead of copied:
153 // dynamic a = dynamic::object("a", "b")("c", "d")
154 ObjectMaker&& operator()(dynamic key, dynamic val) {
155 val_.insert(std::move(key), std::move(val));
156 return std::move(*this);
163 inline void dynamic::array(EmptyArrayTag) {}
165 template <class... Args>
166 inline dynamic dynamic::array(Args&& ...args) {
167 return dynamic(Array{std::forward<Args>(args)...});
170 inline dynamic::ObjectMaker dynamic::object() { return ObjectMaker(); }
171 inline dynamic::ObjectMaker dynamic::object(dynamic a, dynamic b) {
172 return ObjectMaker(std::move(a), std::move(b));
175 //////////////////////////////////////////////////////////////////////
177 struct dynamic::item_iterator : boost::iterator_adaptor<
178 dynamic::item_iterator,
179 dynamic::ObjectImpl::iterator> {
180 /* implicit */ item_iterator(base_type b) : iterator_adaptor_(b) {}
182 using object_type = dynamic::ObjectImpl;
185 friend class boost::iterator_core_access;
188 struct dynamic::value_iterator : boost::iterator_adaptor<
189 dynamic::value_iterator,
190 dynamic::ObjectImpl::iterator,
192 /* implicit */ value_iterator(base_type b) : iterator_adaptor_(b) {}
194 using object_type = dynamic::ObjectImpl;
197 dynamic& dereference() const {
198 return base_reference()->second;
200 friend class boost::iterator_core_access;
203 struct dynamic::const_item_iterator
204 : boost::iterator_adaptor<dynamic::const_item_iterator,
205 dynamic::ObjectImpl::const_iterator> {
206 /* implicit */ const_item_iterator(base_type b) : iterator_adaptor_(b) { }
207 /* implicit */ const_item_iterator(item_iterator i)
208 : iterator_adaptor_(i.base()) {}
209 /* implicit */ const_item_iterator(dynamic::ObjectImpl::iterator i)
210 : iterator_adaptor_(i) {}
212 using object_type = dynamic::ObjectImpl const;
215 friend class boost::iterator_core_access;
218 struct dynamic::const_key_iterator
219 : boost::iterator_adaptor<dynamic::const_key_iterator,
220 dynamic::ObjectImpl::const_iterator,
222 /* implicit */ const_key_iterator(base_type b) : iterator_adaptor_(b) { }
224 using object_type = dynamic::ObjectImpl const;
227 dynamic const& dereference() const {
228 return base_reference()->first;
230 friend class boost::iterator_core_access;
233 struct dynamic::const_value_iterator
234 : boost::iterator_adaptor<dynamic::const_value_iterator,
235 dynamic::ObjectImpl::const_iterator,
237 /* implicit */ const_value_iterator(base_type b) : iterator_adaptor_(b) { }
238 /* implicit */ const_value_iterator(value_iterator i)
239 : iterator_adaptor_(i.base()) {}
240 /* implicit */ const_value_iterator(dynamic::ObjectImpl::iterator i)
241 : iterator_adaptor_(i) {}
243 using object_type = dynamic::ObjectImpl const;
246 dynamic const& dereference() const {
247 return base_reference()->second;
249 friend class boost::iterator_core_access;
252 //////////////////////////////////////////////////////////////////////
254 inline dynamic::dynamic() : dynamic(nullptr) {}
256 inline dynamic::dynamic(std::nullptr_t) : type_(NULLT) {}
258 inline dynamic::dynamic(void (*)(EmptyArrayTag))
261 new (&u_.array) Array();
264 inline dynamic::dynamic(ObjectMaker (*)())
267 new (getAddress<ObjectImpl>()) ObjectImpl();
270 inline dynamic::dynamic(StringPiece s)
273 new (&u_.string) std::string(s.data(), s.size());
276 inline dynamic::dynamic(char const* s)
279 new (&u_.string) std::string(s);
282 inline dynamic::dynamic(std::string s)
285 new (&u_.string) std::string(std::move(s));
288 inline dynamic::dynamic(ObjectMaker&& maker)
291 new (getAddress<ObjectImpl>())
292 ObjectImpl(std::move(*maker.val_.getAddress<ObjectImpl>()));
295 inline dynamic::dynamic(dynamic const& o)
301 inline dynamic::dynamic(dynamic&& o) noexcept
304 *this = std::move(o);
307 inline dynamic::~dynamic() noexcept { destroy(); }
309 // Integral types except bool convert to int64_t, float types to double.
311 struct dynamic::NumericTypeHelper<
312 T, typename std::enable_if<std::is_integral<T>::value>::type> {
313 using type = int64_t;
316 struct dynamic::NumericTypeHelper<bool> {
320 struct dynamic::NumericTypeHelper<float> {
324 struct dynamic::NumericTypeHelper<double> {
328 template<class T, class NumericType /* = typename NumericTypeHelper<T>::type */>
329 dynamic::dynamic(T t) {
330 type_ = TypeInfo<NumericType>::type;
331 new (getAddress<NumericType>()) NumericType(NumericType(t));
334 template <class Iterator>
335 dynamic::dynamic(Iterator first, Iterator last)
338 new (&u_.array) Array(first, last);
341 //////////////////////////////////////////////////////////////////////
343 inline dynamic::const_iterator dynamic::begin() const {
344 return get<Array>().begin();
346 inline dynamic::const_iterator dynamic::end() const {
347 return get<Array>().end();
350 inline dynamic::iterator dynamic::begin() {
351 return get<Array>().begin();
353 inline dynamic::iterator dynamic::end() {
354 return get<Array>().end();
358 struct dynamic::IterableProxy {
360 typedef typename It::value_type value_type;
361 typedef typename It::object_type object_type;
363 /* implicit */ IterableProxy(object_type* o) : o_(o) {}
377 inline dynamic::IterableProxy<dynamic::const_key_iterator> dynamic::keys()
379 return &(get<ObjectImpl>());
382 inline dynamic::IterableProxy<dynamic::const_value_iterator> dynamic::values()
384 return &(get<ObjectImpl>());
387 inline dynamic::IterableProxy<dynamic::const_item_iterator> dynamic::items()
389 return &(get<ObjectImpl>());
392 inline dynamic::IterableProxy<dynamic::value_iterator> dynamic::values() {
393 return &(get<ObjectImpl>());
396 inline dynamic::IterableProxy<dynamic::item_iterator> dynamic::items() {
397 return &(get<ObjectImpl>());
400 inline bool dynamic::isString() const {
401 return get_nothrow<std::string>() != nullptr;
403 inline bool dynamic::isObject() const {
404 return get_nothrow<ObjectImpl>() != nullptr;
406 inline bool dynamic::isBool() const {
407 return get_nothrow<bool>() != nullptr;
409 inline bool dynamic::isArray() const {
410 return get_nothrow<Array>() != nullptr;
412 inline bool dynamic::isDouble() const {
413 return get_nothrow<double>() != nullptr;
415 inline bool dynamic::isInt() const {
416 return get_nothrow<int64_t>() != nullptr;
418 inline bool dynamic::isNull() const {
419 return get_nothrow<void*>() != nullptr;
421 inline bool dynamic::isNumber() const {
422 return isInt() || isDouble();
425 inline dynamic::Type dynamic::type() const {
429 inline std::string dynamic::asString() const {
430 return asImpl<std::string>();
432 inline double dynamic::asDouble() const {
433 return asImpl<double>();
435 inline int64_t dynamic::asInt() const {
436 return asImpl<int64_t>();
438 inline bool dynamic::asBool() const {
439 return asImpl<bool>();
442 inline const std::string& dynamic::getString() const& {
443 return get<std::string>();
445 inline double dynamic::getDouble() const& { return get<double>(); }
446 inline int64_t dynamic::getInt() const& { return get<int64_t>(); }
447 inline bool dynamic::getBool() const& { return get<bool>(); }
449 inline std::string& dynamic::getString()& {
450 return get<std::string>();
452 inline double& dynamic::getDouble() & { return get<double>(); }
453 inline int64_t& dynamic::getInt() & { return get<int64_t>(); }
454 inline bool& dynamic::getBool() & { return get<bool>(); }
456 inline std::string&& dynamic::getString()&& {
457 return std::move(get<std::string>());
459 inline double dynamic::getDouble() && { return get<double>(); }
460 inline int64_t dynamic::getInt() && { return get<int64_t>(); }
461 inline bool dynamic::getBool() && { return get<bool>(); }
463 inline const char* dynamic::data() const& {
464 return get<std::string>().data();
466 inline const char* dynamic::c_str() const& {
467 return get<std::string>().c_str();
469 inline StringPiece dynamic::stringPiece() const {
470 return get<std::string>();
474 struct dynamic::CompareOp {
475 static bool comp(T const& a, T const& b) { return a < b; }
478 struct dynamic::CompareOp<dynamic::ObjectImpl> {
479 static bool comp(ObjectImpl const&, ObjectImpl const&) {
480 // This code never executes; it is just here for the compiler.
485 inline dynamic& dynamic::operator+=(dynamic const& o) {
486 if (type() == STRING && o.type() == STRING) {
487 *getAddress<std::string>() += *o.getAddress<std::string>();
490 *this = detail::numericOp<std::plus>(*this, o);
494 inline dynamic& dynamic::operator-=(dynamic const& o) {
495 *this = detail::numericOp<std::minus>(*this, o);
499 inline dynamic& dynamic::operator*=(dynamic const& o) {
500 *this = detail::numericOp<std::multiplies>(*this, o);
504 inline dynamic& dynamic::operator/=(dynamic const& o) {
505 *this = detail::numericOp<std::divides>(*this, o);
509 #define FB_DYNAMIC_INTEGER_OP(op) \
510 inline dynamic& dynamic::operator op(dynamic const& o) { \
511 if (!isInt() || !o.isInt()) { \
512 throw TypeError("int64", type(), o.type()); \
514 *getAddress<int64_t>() op o.asInt(); \
518 FB_DYNAMIC_INTEGER_OP(%=)
519 FB_DYNAMIC_INTEGER_OP(|=)
520 FB_DYNAMIC_INTEGER_OP(&=)
521 FB_DYNAMIC_INTEGER_OP(^=)
523 #undef FB_DYNAMIC_INTEGER_OP
525 inline dynamic& dynamic::operator++() {
530 inline dynamic& dynamic::operator--() {
535 inline dynamic const& dynamic::operator[](dynamic const& idx) const& {
539 inline dynamic&& dynamic::operator[](dynamic const& idx) && {
540 return std::move((*this)[idx]);
543 template<class K, class V> inline dynamic& dynamic::setDefault(K&& k, V&& v) {
544 auto& obj = get<ObjectImpl>();
545 return obj.insert(std::make_pair(std::forward<K>(k),
546 std::forward<V>(v))).first->second;
549 template<class K> inline dynamic& dynamic::setDefault(K&& k, dynamic&& v) {
550 auto& obj = get<ObjectImpl>();
551 return obj.insert(std::make_pair(std::forward<K>(k),
552 std::move(v))).first->second;
555 template<class K> inline dynamic& dynamic::setDefault(K&& k, const dynamic& v) {
556 auto& obj = get<ObjectImpl>();
557 return obj.insert(std::make_pair(std::forward<K>(k), v)).first->second;
560 inline dynamic* dynamic::get_ptr(dynamic const& idx) & {
561 return const_cast<dynamic*>(const_cast<dynamic const*>(this)->get_ptr(idx));
564 inline dynamic& dynamic::at(dynamic const& idx) & {
565 return const_cast<dynamic&>(const_cast<dynamic const*>(this)->at(idx));
568 inline dynamic&& dynamic::at(dynamic const& idx) && {
569 return std::move(at(idx));
572 inline bool dynamic::empty() const {
579 inline std::size_t dynamic::count(dynamic const& key) const {
580 return find(key) != items().end() ? 1u : 0u;
583 inline dynamic::const_item_iterator dynamic::find(dynamic const& key) const {
584 return get<ObjectImpl>().find(key);
586 inline dynamic::item_iterator dynamic::find(dynamic const& key) {
587 return get<ObjectImpl>().find(key);
590 template<class K, class V> inline void dynamic::insert(K&& key, V&& val) {
591 auto& obj = get<ObjectImpl>();
592 auto rv = obj.insert({ std::forward<K>(key), nullptr });
593 rv.first->second = std::forward<V>(val);
596 inline void dynamic::update(const dynamic& mergeObj) {
597 if (!isObject() || !mergeObj.isObject()) {
598 throw TypeError("object", type(), mergeObj.type());
601 for (const auto& pair : mergeObj.items()) {
602 (*this)[pair.first] = pair.second;
606 inline void dynamic::update_missing(const dynamic& mergeObj1) {
607 if (!isObject() || !mergeObj1.isObject()) {
608 throw TypeError("object", type(), mergeObj1.type());
611 // Only add if not already there
612 for (const auto& pair : mergeObj1.items()) {
613 if ((*this).find(pair.first) == (*this).items().end()) {
614 (*this)[pair.first] = pair.second;
619 inline dynamic dynamic::merge(
620 const dynamic& mergeObj1,
621 const dynamic& mergeObj2) {
623 // No checks on type needed here because they are done in update_missing
624 // Note that we do update_missing here instead of update() because
625 // it will prevent the extra writes that would occur with update()
626 auto ret = mergeObj2;
627 ret.update_missing(mergeObj1);
631 inline std::size_t dynamic::erase(dynamic const& key) {
632 auto& obj = get<ObjectImpl>();
633 return obj.erase(key);
636 inline dynamic::iterator dynamic::erase(const_iterator it) {
637 auto& arr = get<Array>();
638 // std::vector doesn't have an erase method that works on const iterators,
639 // even though the standard says it should, so this hack converts to a
640 // non-const iterator before calling erase.
641 return get<Array>().erase(arr.begin() + (it - arr.begin()));
644 inline dynamic::const_key_iterator dynamic::erase(const_key_iterator it) {
645 return const_key_iterator(get<ObjectImpl>().erase(it.base()));
648 inline dynamic::const_key_iterator dynamic::erase(
649 const_key_iterator first,
650 const_key_iterator last) {
651 return const_key_iterator(get<ObjectImpl>().erase(first.base(),
655 inline dynamic::value_iterator dynamic::erase(const_value_iterator it) {
656 return value_iterator(get<ObjectImpl>().erase(it.base()));
659 inline dynamic::value_iterator dynamic::erase(
660 const_value_iterator first,
661 const_value_iterator last) {
662 return value_iterator(get<ObjectImpl>().erase(first.base(), last.base()));
665 inline dynamic::item_iterator dynamic::erase(const_item_iterator it) {
666 return item_iterator(get<ObjectImpl>().erase(it.base()));
669 inline dynamic::item_iterator dynamic::erase(
670 const_item_iterator first,
671 const_item_iterator last) {
672 return item_iterator(get<ObjectImpl>().erase(first.base(), last.base()));
675 inline void dynamic::resize(std::size_t sz, dynamic const& c) {
676 auto& arr = get<Array>();
680 inline void dynamic::push_back(dynamic const& v) {
681 auto& arr = get<Array>();
685 inline void dynamic::push_back(dynamic&& v) {
686 auto& arr = get<Array>();
687 arr.push_back(std::move(v));
690 inline void dynamic::pop_back() {
691 auto& arr = get<Array>();
695 //////////////////////////////////////////////////////////////////////
697 inline dynamic::dynamic(Array&& r) : type_(ARRAY) {
698 new (&u_.array) Array(std::move(r));
701 #define FOLLY_DYNAMIC_DEC_TYPEINFO(T, str, val) \
702 template <> struct dynamic::TypeInfo<T> { \
703 static constexpr const char* name = str; \
704 static constexpr dynamic::Type type = val; \
708 FOLLY_DYNAMIC_DEC_TYPEINFO(void*, "null", dynamic::NULLT)
709 FOLLY_DYNAMIC_DEC_TYPEINFO(bool, "boolean", dynamic::BOOL)
710 FOLLY_DYNAMIC_DEC_TYPEINFO(std::string, "string", dynamic::STRING)
711 FOLLY_DYNAMIC_DEC_TYPEINFO(dynamic::Array, "array", dynamic::ARRAY)
712 FOLLY_DYNAMIC_DEC_TYPEINFO(double, "double", dynamic::DOUBLE)
713 FOLLY_DYNAMIC_DEC_TYPEINFO(int64_t, "int64", dynamic::INT64)
714 FOLLY_DYNAMIC_DEC_TYPEINFO(dynamic::ObjectImpl, "object", dynamic::OBJECT)
716 #undef FOLLY_DYNAMIC_DEC_TYPEINFO
719 T dynamic::asImpl() const {
721 case INT64: return to<T>(*get_nothrow<int64_t>());
722 case DOUBLE: return to<T>(*get_nothrow<double>());
723 case BOOL: return to<T>(*get_nothrow<bool>());
725 return to<T>(*get_nothrow<std::string>());
727 throw TypeError("int/double/bool/string", type());
731 // Return a T* to our type, or null if we're not that type.
733 T* dynamic::get_nothrow() & noexcept {
734 if (type_ != TypeInfo<T>::type) {
737 return getAddress<T>();
741 T const* dynamic::get_nothrow() const& noexcept {
742 return const_cast<dynamic*>(this)->get_nothrow<T>();
745 // Return T* for where we can put a T, without type checking. (Memory
746 // might be uninitialized, even.)
748 T* dynamic::getAddress() noexcept {
749 return GetAddrImpl<T>::get(u_);
753 T const* dynamic::getAddress() const noexcept {
754 return const_cast<dynamic*>(this)->getAddress<T>();
757 template<class T> struct dynamic::GetAddrImpl {};
758 template<> struct dynamic::GetAddrImpl<void*> {
759 static void** get(Data& d) noexcept { return &d.nul; }
761 template<> struct dynamic::GetAddrImpl<dynamic::Array> {
762 static Array* get(Data& d) noexcept { return &d.array; }
764 template<> struct dynamic::GetAddrImpl<bool> {
765 static bool* get(Data& d) noexcept { return &d.boolean; }
767 template<> struct dynamic::GetAddrImpl<int64_t> {
768 static int64_t* get(Data& d) noexcept { return &d.integer; }
770 template<> struct dynamic::GetAddrImpl<double> {
771 static double* get(Data& d) noexcept { return &d.doubl; }
774 struct dynamic::GetAddrImpl<std::string> {
775 static std::string* get(Data& d) noexcept {
779 template<> struct dynamic::GetAddrImpl<dynamic::ObjectImpl> {
780 static_assert(sizeof(ObjectImpl) <= sizeof(Data::objectBuffer),
781 "In your implementation, std::unordered_map<> apparently takes different"
782 " amount of space depending on its template parameters. This is "
783 "weird. Make objectBuffer bigger if you want to compile dynamic.");
785 static ObjectImpl* get(Data& d) noexcept {
786 void* data = &d.objectBuffer;
787 return static_cast<ObjectImpl*>(data);
793 if (auto* p = get_nothrow<T>()) {
796 throw TypeError(TypeInfo<T>::name, type());
800 T const& dynamic::get() const {
801 return const_cast<dynamic*>(this)->get<T>();
804 //////////////////////////////////////////////////////////////////////
807 * Helper for implementing operator<<. Throws if the type shouldn't
811 struct dynamic::PrintImpl {
812 static void print(dynamic const&, std::ostream& out, T const& t) {
816 // Otherwise, null, being (void*)0, would print as 0.
818 struct dynamic::PrintImpl<void*> {
819 static void print(dynamic const& /* d */,
822 DCHECK_EQ((void*)0, nul);
827 struct dynamic::PrintImpl<dynamic::ObjectImpl> {
828 static void print(dynamic const& d,
830 dynamic::ObjectImpl const&) {
831 d.print_as_pseudo_json(out);
835 struct dynamic::PrintImpl<dynamic::Array> {
836 static void print(dynamic const& d,
838 dynamic::Array const&) {
839 d.print_as_pseudo_json(out);
843 inline void dynamic::print(std::ostream& out) const {
844 #define FB_X(T) PrintImpl<T>::print(*this, out, *getAddress<T>())
845 FB_DYNAMIC_APPLY(type_, FB_X);
849 inline std::ostream& operator<<(std::ostream& out, dynamic const& d) {
854 //////////////////////////////////////////////////////////////////////
856 // Secialization of FormatValue so dynamic objects can be formatted
858 class FormatValue<dynamic> {
860 explicit FormatValue(const dynamic& val) : val_(val) { }
862 template <class FormatCallback>
863 void format(FormatArg& arg, FormatCallback& cb) const {
864 switch (val_.type()) {
866 FormatValue<std::nullptr_t>(nullptr).format(arg, cb);
869 FormatValue<bool>(val_.asBool()).format(arg, cb);
872 FormatValue<int64_t>(val_.asInt()).format(arg, cb);
874 case dynamic::STRING:
875 FormatValue<std::string>(val_.asString()).format(arg, cb);
877 case dynamic::DOUBLE:
878 FormatValue<double>(val_.asDouble()).format(arg, cb);
881 FormatValue(val_.at(arg.splitIntKey())).format(arg, cb);
883 case dynamic::OBJECT:
884 FormatValue(val_.at(arg.splitKey().toString())).format(arg, cb);
894 class FormatValue<detail::DefaultValueWrapper<dynamic, V>> {
896 explicit FormatValue(
897 const detail::DefaultValueWrapper<dynamic, V>& val)
900 template <class FormatCallback>
901 void format(FormatArg& arg, FormatCallback& cb) const {
902 auto& c = val_.container;
907 case dynamic::STRING:
908 case dynamic::DOUBLE:
909 FormatValue<dynamic>(c).format(arg, cb);
913 int key = arg.splitIntKey();
914 if (key >= 0 && size_t(key) < c.size()) {
915 FormatValue<dynamic>(c.at(key)).format(arg, cb);
917 FormatValue<V>(val_.defaultValue).format(arg, cb);
921 case dynamic::OBJECT:
923 auto pos = c.find(arg.splitKey());
924 if (pos != c.items().end()) {
925 FormatValue<dynamic>(pos->second).format(arg, cb);
927 FormatValue<V>(val_.defaultValue).format(arg, cb);
935 const detail::DefaultValueWrapper<dynamic, V>& val_;
940 #undef FB_DYNAMIC_APPLY