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Merge branch 'develop' into iterator_arithmetic

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This commit is contained in:
HenryLee
2017-06-09 20:47:42 +10:00
parent 6661ec755b 52f934cbbf
commit e12c2ee6a8
2 changed files with 96 additions and 4 deletions
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52
src/json.hpp
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@ -285,7 +285,7 @@ class invalid_iterator : public exception
Exceptions have ids 3xx.
name / id | example massage | description
name / id | example message | description
----------------------------- | --------------- | -------------------------
json.exception.type_error.301 | cannot create object from initializer list | To create an object from an initializer list, the initializer list must consist only of a list of pairs whose first element is a string. When this constraint is violated, an array is created instead.
json.exception.type_error.302 | type must be object, but is array | During implicit or explicit value conversion, the JSON type must be compatible to the target type. For instance, a JSON string can only be converted into string types, but not into numbers or boolean types.
@ -324,7 +324,7 @@ class type_error : public exception
Exceptions have ids 4xx.
name / id | example massage | description
name / id | example message | description
------------------------------- | --------------- | -------------------------
json.exception.out_of_range.401 | array index 3 is out of range | The provided array index @a i is larger than @a size-1.
json.exception.out_of_range.402 | array index '-' (3) is out of range | The special array index `-` in a JSON Pointer never describes a valid element of the array, but the index past the end. That is, it can only be used to add elements at this position, but not to read it.
@ -355,9 +355,10 @@ class out_of_range : public exception
Exceptions have ids 5xx.
name / id | example massage | description
name / id | example message | description
------------------------------ | --------------- | -------------------------
json.exception.other_error.501 | unsuccessful: {"op":"test","path":"/baz", "value":"bar"} | A JSON Patch operation 'test' failed. The unsuccessful operation is also printed.
json.exception.other_error.502 | invalid object size for conversion | Some conversions to user-defined types impose constraints on the object size (e.g. std::pair)
@since version 3.0.0
*/
@ -865,6 +866,14 @@ void to_json(BasicJsonType& j, T (&arr)[N])
external_constructor<value_t::array>::construct(j, arr);
}
template <typename BasicJsonType, typename CompatibleString, typename T,
enable_if_t<std::is_constructible<typename BasicJsonType::string_t,
CompatibleString>::value, int> = 0>
void to_json(BasicJsonType& j, std::pair<CompatibleString, T> const& p)
{
j[p.first] = p.second;
}
///////////////
// from_json //
///////////////
@ -1037,10 +1046,24 @@ void from_json(const BasicJsonType& j, CompatibleObjectType& obj)
auto inner_object = j.template get_ptr<const typename BasicJsonType::object_t*>();
using std::begin;
using std::end;
using value_type = typename CompatibleObjectType::value_type;
std::vector<value_type> v;
v.reserve(j.size());
std::transform(
inner_object->begin(), inner_object->end(), std::back_inserter(v),
[](typename BasicJsonType::object_t::value_type const & p)
{
return value_type
{
p.first,
p.second
.template get<typename CompatibleObjectType::mapped_type>()};
});
// we could avoid the assignment, but this might require a for loop, which
// might be less efficient than the container constructor for some
// containers (would it?)
obj = CompatibleObjectType(begin(*inner_object), end(*inner_object));
obj = CompatibleObjectType(std::make_move_iterator(begin(v)),
std::make_move_iterator(end(v)));
}
// overload for arithmetic types, not chosen for basic_json template arguments
@ -1086,6 +1109,27 @@ void from_json(const BasicJsonType& j, ArithmeticType& val)
}
}
template <typename BasicJsonType, typename CompatibleString, typename T,
enable_if_t<std::is_constructible<typename BasicJsonType::string_t,
CompatibleString>::value, int> = 0>
void from_json(const BasicJsonType& j, std::pair<CompatibleString, T>& p)
{
if (not j.is_object())
{
JSON_THROW(type_error::create(302, "type must be object, but is " + j.type_name()));
}
auto const inner_object = j.template get_ptr<const typename BasicJsonType::object_t*>();
auto const size = inner_object->size();
if (size != 1)
{
JSON_THROW(other_error::create(502, "conversion to std::pair requires the object to have exactly one field, but it has " + std::to_string(size)));
}
auto const& obj = *inner_object->begin();
// cannot use *inner_object, need to convert both members
p = std::make_pair(obj.first, obj.second.template get<T>());
}
struct to_json_fn
{
private: