j3d1/json
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

Merge branch 'feature/key_ref' into develop (fixes #1098)

Browse source
This commit is contained in:
Niels Lohmann 2018-05-27 22:26:00 +02:00
commit db03d09312
No known key found for this signature in database
GPG key ID: 7F3CEA63AE251B69
3 changed files with 34 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/nlohmann/detail/iterators/iter_impl.hpp
View file

@ -583,7 +583,7 @@ class iter_impl
@brief return the key of an object iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
typename object_t::key_type key() const
const typename object_t::key_type& key() const
{
assert(m_object != nullptr);

19
include/nlohmann/detail/iterators/iteration_proxy.hpp
View file

@ -21,6 +21,12 @@ template<typename IteratorType> class iteration_proxy
IteratorType anchor;
/// an index for arrays (used to create key names)
std::size_t array_index = 0;
/// last stringified array index
mutable std::size_t array_index_last = 0;
/// a string representation of the array index
mutable std::string array_index_str = "0";
/// an empty string (to return a reference for primitive values)
const std::string empty_str = "";
public:
explicit iteration_proxy_internal(IteratorType it) noexcept : anchor(it) {}
@ -47,7 +53,7 @@ template<typename IteratorType> class iteration_proxy
}
/// return key of the iterator
std::string key() const
const std::string& key() const
{
assert(anchor.m_object != nullptr);
@ -55,7 +61,14 @@ template<typename IteratorType> class iteration_proxy
{
// use integer array index as key
case value_t::array:
return std::to_string(array_index);
{
if (array_index != array_index_last)
{
array_index_str = std::to_string(array_index);
array_index_last = array_index;
}
return array_index_str;
}
// use key from the object
case value_t::object:
@ -63,7 +76,7 @@ template<typename IteratorType> class iteration_proxy
// use an empty key for all primitive types
default:
return "";
return empty_str;
}
}

21
single_include/nlohmann/json.hpp
View file

@ -5210,7 +5210,7 @@ class iter_impl
@brief return the key of an object iterator
@pre The iterator is initialized; i.e. `m_object != nullptr`.
*/
typename object_t::key_type key() const
const typename object_t::key_type& key() const
{
assert(m_object != nullptr);
@ -5265,6 +5265,12 @@ template<typename IteratorType> class iteration_proxy
IteratorType anchor;
/// an index for arrays (used to create key names)
std::size_t array_index = 0;
/// last stringified array index
mutable std::size_t array_index_last = 0;
/// a string representation of the array index
mutable std::string array_index_str = "0";
/// an empty string (to return a reference for primitive values)
const std::string empty_str = "";
public:
explicit iteration_proxy_internal(IteratorType it) noexcept : anchor(it) {}
@ -5291,7 +5297,7 @@ template<typename IteratorType> class iteration_proxy
}
/// return key of the iterator
std::string key() const
const std::string& key() const
{
assert(anchor.m_object != nullptr);
@ -5299,7 +5305,14 @@ template<typename IteratorType> class iteration_proxy
{
// use integer array index as key
case value_t::array:
return std::to_string(array_index);
{
if (array_index != array_index_last)
{
array_index_str = std::to_string(array_index);
array_index_last = array_index;
}
return array_index_str;
}
// use key from the object
case value_t::object:
@ -5307,7 +5320,7 @@ template<typename IteratorType> class iteration_proxy
// use an empty key for all primitive types
default:
return "";
return empty_str;
}
}