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💥 changed iterators to andom_access_iterator #593

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This commit changes the iterator category to andom_access_iterator and allows offsets and subscript operators for object iterators.
This commit is contained in:
Niels Lohmann
2017-08-16 21:35:22 +02:00
parent aba8b58492
commit c77a0be5f3
3 changed files with 68 additions and 138 deletions
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25
src/json.hpp
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@ -44,7 +44,7 @@ SOFTWARE.
#include <initializer_list> // initializer_list
#include <iomanip> // hex
#include <iosfwd> // istream, ostream
#include <iterator> // advance, begin, back_inserter, bidirectional_iterator_tag, distance, end, inserter, iterator, iterator_traits, next, random_access_iterator_tag, reverse_iterator
#include <iterator> // advance, begin, back_inserter, distance, end, inserter, iterator, iterator_traits, next, random_access_iterator_tag, reverse_iterator
#include <limits> // numeric_limits
#include <locale> // locale
#include <map> // map
@ -281,8 +281,6 @@ json.exception.invalid_iterator.204 | iterators out of range | When an iterator
json.exception.invalid_iterator.205 | iterator out of range | When an iterator for a primitive type (number, boolean, or string) is passed to an erase function, the iterator has to be the @ref begin() iterator, because it is the only way to address the stored value. All other iterators are invalid.
json.exception.invalid_iterator.206 | cannot construct with iterators from null | The iterators passed to constructor @ref basic_json(InputIT first, InputIT last) belong to a JSON null value and hence to not define a valid range.
json.exception.invalid_iterator.207 | cannot use key() for non-object iterators | The key() member function can only be used on iterators belonging to a JSON object, because other types do not have a concept of a key.
json.exception.invalid_iterator.208 | cannot use operator[] for object iterators | The operator[] to specify a concrete offset cannot be used on iterators belonging to a JSON object, because JSON objects are unordered.
json.exception.invalid_iterator.209 | cannot use offsets with object iterators | The offset operators (+, -, +=, -=) cannot be used on iterators belonging to a JSON object, because JSON objects are unordered.
json.exception.invalid_iterator.210 | iterators do not fit | The iterator range passed to the insert function are not compatible, meaning they do not belong to the same container. Therefore, the range (@a first, @a last) is invalid.
json.exception.invalid_iterator.211 | passed iterators may not belong to container | The iterator range passed to the insert function must not be a subrange of the container to insert to.
json.exception.invalid_iterator.212 | cannot compare iterators of different containers | When two iterators are compared, they must belong to the same container.
@ -3555,7 +3553,7 @@ class iter_impl : public std::iterator<std::random_access_iterator_tag, BasicJso
typename BasicJsonType::const_reference,
typename BasicJsonType::reference>::type;
/// the category of the iterator
using iterator_category = std::bidirectional_iterator_tag;
using iterator_category = std::random_access_iterator_tag;
/// default constructor
iter_impl() = default;
@ -3949,7 +3947,8 @@ class iter_impl : public std::iterator<std::random_access_iterator_tag, BasicJso
switch (m_object->m_type)
{
case value_t::object:
JSON_THROW(invalid_iterator::create(209, "cannot use offsets with object iterators"));
std::advance(m_it.object_iterator, i);
break;
case value_t::array:
{
@ -4020,7 +4019,11 @@ class iter_impl : public std::iterator<std::random_access_iterator_tag, BasicJso
switch (m_object->m_type)
{
case value_t::object:
JSON_THROW(invalid_iterator::create(209, "cannot use offsets with object iterators"));
{
difference_type result = 0;
for (auto it = other; it != *this; ++it, ++result);
return result;
}
case value_t::array:
return m_it.array_iterator - other.m_it.array_iterator;
@ -4041,7 +4044,11 @@ class iter_impl : public std::iterator<std::random_access_iterator_tag, BasicJso
switch (m_object->m_type)
{
case value_t::object:
JSON_THROW(invalid_iterator::create(208, "cannot use operator[] for object iterators"));
{
auto it = *this;
std::advance(it.m_it.object_iterator, n);
return *it;
}
case value_t::array:
return *std::next(m_it.array_iterator, n);
@ -13187,7 +13194,7 @@ class basic_json
*/
template<typename A1, typename A2,
detail::enable_if_t<std::is_constructible<detail::input_adapter, A1, A2>::value, int> = 0>
static basic_json from_cbor(A1&& a1, A2&& a2, const bool strict = true)
static basic_json from_cbor(A1 && a1, A2 && a2, const bool strict = true)
{
return binary_reader(detail::input_adapter(std::forward<A1>(a1), std::forward<A2>(a2))).parse_cbor(strict);
}
@ -13274,7 +13281,7 @@ class basic_json
*/
template<typename A1, typename A2,
detail::enable_if_t<std::is_constructible<detail::input_adapter, A1, A2>::value, int> = 0>
static basic_json from_msgpack(A1&& a1, A2&& a2, const bool strict = true)
static basic_json from_msgpack(A1 && a1, A2 && a2, const bool strict = true)
{
return binary_reader(detail::input_adapter(std::forward<A1>(a1), std::forward<A2>(a2))).parse_msgpack(strict);
}