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fix #600

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Instead of calling CompatibleObjectType iterator-range constructor,
first convert json::value_type to CompatibleObjectType::value_type
This commit is contained in:
Théo DELRIEU 2017-06-06 14:18:32 +02:00
parent 85de93ba93
commit cea39dfaa8
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GPG key ID: C64D5E244E08ADC6
2 changed files with 56 additions and 20 deletions
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28
src/json.hpp
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@ -867,11 +867,11 @@ void to_json(BasicJsonType& j, T (&arr)[N])
}
template <typename BasicJsonType, typename CompatibleString, typename T,
enable_if_t<std::is_constructible<typename BasicJsonType::string_t,
CompatibleString>::value, int> = 0>
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;
j[p.first] = p.second;
}
///////////////
@ -1046,10 +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
@ -1096,8 +1110,8 @@ 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>
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())
@ -1112,7 +1126,7 @@ void from_json(const BasicJsonType& j, std::pair<CompatibleString, T>& p)
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
// cannot use *inner_object, need to convert both members
p = std::make_pair(obj.first, obj.second.template get<T>());
}

48
test/src/unit-constructor1.cpp
View file

@ -158,16 +158,27 @@ TEST_CASE("constructors")
SECTION("std::pair<CompatibleString, T>")
{
std::pair<std::string, std::string> p{"first", "second"};
json j(p);
std::pair<std::string, std::string> p{"first", "second"};
json j(p);
CHECK((j.get<decltype(p)>() == p));
CHECK((j.get<decltype(p)>() == p));
std::pair<std::string, int> p2{"first", 1};
// use char const*
json j2(std::make_pair("first", 1));
std::pair<std::string, int> p2{"first", 1};
// use char const*
json j2(std::make_pair("first", 1));
CHECK((j2.get<decltype(p2)>() == p2));
CHECK((j2.get<decltype(p2)>() == p2));
}
SECTION("std::map<std::string, std::string> #600")
{
std::map<std::string, std::string> m;
m["a"] = "b";
m["c"] = "d";
m["e"] = "f";
json j(m);
CHECK((j.get<decltype(m)>() == m));
}
SECTION("std::map<const char*, json>")
@ -971,12 +982,23 @@ TEST_CASE("constructors")
SECTION("std::pair<CompatibleString, T> with error")
{
json j{{"too", "much"}, {"string", "fields"}};
CHECK_THROWS_AS((j.get<std::pair<std::string, std::string>>()), json::other_error);
CHECK_THROWS_WITH((j.get<std::pair<std::string, std::string>>()),
"[json.exception.other_error.502] conversion "
"to std::pair requires the object to have "
"exactly one field, but it has 2");
SECTION("wrong field number")
{
json j{{"too", "much"}, {"string", "fields"}};
CHECK_THROWS_AS((j.get<std::pair<std::string, std::string>>()), json::other_error);
CHECK_THROWS_WITH((j.get<std::pair<std::string, std::string>>()),
"[json.exception.other_error.502] conversion "
"to std::pair requires the object to have "
"exactly one field, but it has 2");
}
SECTION("wrong JSON type")
{
json j(42);
CHECK_THROWS_AS((j.get<std::pair<std::string, std::string>>()), json::type_error);
CHECK_THROWS_WITH((j.get<std::pair<std::string, std::string>>()),
"[json.exception.type_error.302] type must be object, but is number");
}
}