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from_json: add overload for std::unordered_map

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Fixes #1133
This commit is contained in:
Théo DELRIEU 2018-06-18 10:53:30 +02:00
parent 299469cfd5
commit 2b37d7ed86
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GPG key ID: A5A505438C20539A
2 changed files with 66 additions and 4 deletions
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20
include/nlohmann/detail/conversions/from_json.hpp
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@ -9,6 +9,7 @@
#include <string> // string
#include <tuple> // tuple, make_tuple
#include <type_traits> // is_arithmetic, is_same, is_enum, underlying_type, is_convertible
#include <unordered_map> // unordered_map
#include <utility> // pair, declval
#include <valarray> // valarray
@ -297,6 +298,25 @@ void from_json(const BasicJsonType& j, std::map<Key, Value, Compare, Allocator>&
}
}
template <typename BasicJsonType, typename Key, typename Value, typename Hash, typename KeyEqual, typename Allocator,
typename = enable_if_t<not std::is_constructible<
typename BasicJsonType::string_t, Key>::value>>
void from_json(const BasicJsonType& j, std::unordered_map<Key, Value, Hash, KeyEqual, Allocator>& m)
{
if (JSON_UNLIKELY(not j.is_array()))
{
JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
}
for (const auto& p : j)
{
if (JSON_UNLIKELY(not p.is_array()))
{
JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(p.type_name())));
}
m.emplace(p.at(0).template get<Key>(), p.at(1).template get<Value>());
}
}
struct from_json_fn
{
private: