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🚑 add specialization of get_to #2175

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This commit is contained in:
Niels Lohmann 2020-06-30 14:26:52 +02:00
parent eb7376bb13
commit c7e079cc98
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GPG key ID: 7F3CEA63AE251B69
3 changed files with 41 additions and 11 deletions
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12
include/nlohmann/json.hpp
View file

@ -3019,6 +3019,18 @@ class basic_json
return v;
}
// specialization to allow to call get_to with a basic_json value
// see https://github.com/nlohmann/json/issues/2175
template<typename ValueType,
detail::enable_if_t <
detail::is_basic_json<ValueType>::value,
int> = 0>
ValueType & get_to(ValueType& v) const
{
v = *this;
return v;
}
template <
typename T, std::size_t N,
typename Array = T (&)[N],

12
single_include/nlohmann/json.hpp
View file

@ -18949,6 +18949,18 @@ class basic_json
return v;
}
// specialization to allow to call get_to with a basic_json value
// see https://github.com/nlohmann/json/issues/2175
template<typename ValueType,
detail::enable_if_t <
detail::is_basic_json<ValueType>::value,
int> = 0>
ValueType & get_to(ValueType& v) const
{
v = *this;
return v;
}
template <
typename T, std::size_t N,
typename Array = T (&)[N],

28
test/src/unit-udt_macro.cpp
View file

@ -41,20 +41,22 @@ class person_with_private_data
private:
std::string name;
int age = 0;
json metadata;
public:
bool operator==(const person_with_private_data& rhs) const
{
return std::tie(name, age) == std::tie(rhs.name, rhs.age);
return std::tie(name, age, metadata) == std::tie(rhs.name, rhs.age, rhs.metadata);
}
person_with_private_data() = default;
person_with_private_data(std::string name, int age)
person_with_private_data(std::string name, int age, json metadata)
: name(std::move(name))
, age(age)
, metadata(std::move(metadata))
{}
NLOHMANN_DEFINE_TYPE_INTRUSIVE(person_with_private_data, age, name);
NLOHMANN_DEFINE_TYPE_INTRUSIVE(person_with_private_data, age, name, metadata);
};
class person_without_private_data_1
@ -62,19 +64,21 @@ class person_without_private_data_1
public:
std::string name;
int age = 0;
json metadata;
bool operator==(const person_without_private_data_1& rhs) const
{
return std::tie(name, age) == std::tie(rhs.name, rhs.age);
return std::tie(name, age, metadata) == std::tie(rhs.name, rhs.age, rhs.metadata);
}
person_without_private_data_1() = default;
person_without_private_data_1(std::string name, int age)
person_without_private_data_1(std::string name, int age, json metadata)
: name(std::move(name))
, age(age)
, metadata(std::move(metadata))
{}
NLOHMANN_DEFINE_TYPE_INTRUSIVE(person_without_private_data_1, age, name);
NLOHMANN_DEFINE_TYPE_INTRUSIVE(person_without_private_data_1, age, name, metadata);
};
class person_without_private_data_2
@ -82,20 +86,22 @@ class person_without_private_data_2
public:
std::string name;
int age = 0;
json metadata;
bool operator==(const person_without_private_data_2& rhs) const
{
return std::tie(name, age) == std::tie(rhs.name, rhs.age);
return std::tie(name, age, metadata) == std::tie(rhs.name, rhs.age, rhs.metadata);
}
person_without_private_data_2() = default;
person_without_private_data_2(std::string name, int age)
person_without_private_data_2(std::string name, int age, json metadata)
: name(std::move(name))
, age(age)
, metadata(std::move(metadata))
{}
};
NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(person_without_private_data_2, age, name);
NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(person_without_private_data_2, age, name, metadata);
} // namespace persons
TEST_CASE_TEMPLATE("Serialization/deserialization via NLOHMANN_DEFINE_TYPE_INTRUSIVE", T,
@ -106,8 +112,8 @@ TEST_CASE_TEMPLATE("Serialization/deserialization via NLOHMANN_DEFINE_TYPE_INTRU
SECTION("person")
{
// serialization
T p1("Erik", 1);
CHECK(json(p1).dump() == "{\"age\":1,\"name\":\"Erik\"}");
T p1("Erik", 1, {{"haircuts", 2}});
CHECK(json(p1).dump() == "{\"age\":1,\"metadata\":{\"haircuts\":2},\"name\":\"Erik\"}");
// deserialization
T p2 = json(p1);