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feat: Rebase feature/optional to develop (#4036)

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* 🚧 conversions for std::optional

* 🏁 fix <optional> inclusion

* 💚 overwork tests

* Use JSON_HAS_CPP_17 only after it has been defined

* ✅ update tests

* 🏁 include right <optional> header

* ♻️ do not include experimental headers

* Add missing #endif after rebase

* Fix failing test

* Only define conversion to std::optional when JSON_USE_IMPLICIT_CONVERSION is disabled.

* missing endif

* Remove Wfloat-equal suppress

* amalgamate

* Move include of optional out of macro_scope; probably does not make sense to be there

* Make clang-tidy happy

* Suppress lint instead of changing to 'contains'

---------

Co-authored-by: Niels Lohmann <mail@nlohmann.me>
Co-authored-by: Markus Palonen <markus.palonen@gmail.com>
This commit is contained in:
Fredrik Sandhei 2024-11-16 17:19:33 +01:00 committed by GitHub
parent fd20975a94
commit 060414037e
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4 changed files with 172 additions and 0 deletions
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22
include/nlohmann/detail/conversions/from_json.hpp
View File

@ -13,6 +13,9 @@
#include <forward_list> // forward_list
#include <iterator> // inserter, front_inserter, end
#include <map> // map
#ifdef JSON_HAS_CPP_17
#include <optional> // optional
#endif
#include <string> // string
#include <tuple> // tuple, make_tuple
#include <type_traits> // is_arithmetic, is_same, is_enum, underlying_type, is_convertible
@ -20,6 +23,7 @@
#include <utility> // pair, declval
#include <valarray> // valarray
#include <nlohmann/detail/exceptions.hpp>
#include <nlohmann/detail/macro_scope.hpp>
#include <nlohmann/detail/meta/cpp_future.hpp>
@ -43,6 +47,24 @@ inline void from_json(const BasicJsonType& j, typename std::nullptr_t& n)
n = nullptr;
}
#ifdef JSON_HAS_CPP_17
#ifndef JSON_USE_IMPLICIT_CONVERSIONS
template<typename BasicJsonType, typename T>
void from_json(const BasicJsonType& j, std::optional<T>& opt)
{
if (j.is_null())
{
opt = std::nullopt;
}
else
{
opt.emplace(j.template get<T>());
}
}
#endif // JSON_USE_IMPLICIT_CONVERSIONS
#endif // JSON_HAS_CPP_17
// overloads for basic_json template parameters
template < typename BasicJsonType, typename ArithmeticType,
enable_if_t < std::is_arithmetic<ArithmeticType>::value&&

19
include/nlohmann/detail/conversions/to_json.hpp
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@ -10,6 +10,9 @@
#include <algorithm> // copy
#include <iterator> // begin, end
#ifdef JSON_HAS_CPP_17
#include <optional> // optional
#endif
#include <string> // string
#include <tuple> // tuple, get
#include <type_traits> // is_same, is_constructible, is_floating_point, is_enum, underlying_type
@ -260,6 +263,22 @@ struct external_constructor<value_t::object>
// to_json //
/////////////
#ifdef JSON_HAS_CPP_17
template<typename BasicJsonType, typename T,
enable_if_t<std::is_constructible<BasicJsonType, T>::value, int> = 0>
void to_json(BasicJsonType& j, const std::optional<T>& opt)
{
if (opt.has_value())
{
j = *opt;
}
else
{
j = nullptr;
}
}
#endif
template<typename BasicJsonType, typename T,
enable_if_t<std::is_same<T, typename BasicJsonType::boolean_t>::value, int> = 0>
inline void to_json(BasicJsonType& j, T b) noexcept

41
single_include/nlohmann/json.hpp
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@ -162,6 +162,9 @@
#include <forward_list> // forward_list
#include <iterator> // inserter, front_inserter, end
#include <map> // map
#ifdef JSON_HAS_CPP_17
#include <optional> // optional
#endif
#include <string> // string
#include <tuple> // tuple, make_tuple
#include <type_traits> // is_arithmetic, is_same, is_enum, underlying_type, is_convertible
@ -169,6 +172,7 @@
#include <utility> // pair, declval
#include <valarray> // valarray
// #include <nlohmann/detail/exceptions.hpp>
// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++
@ -4696,6 +4700,24 @@ inline void from_json(const BasicJsonType& j, typename std::nullptr_t& n)
n = nullptr;
}
#ifdef JSON_HAS_CPP_17
#ifndef JSON_USE_IMPLICIT_CONVERSIONS
template<typename BasicJsonType, typename T>
void from_json(const BasicJsonType& j, std::optional<T>& opt)
{
if (j.is_null())
{
opt = std::nullopt;
}
else
{
opt.emplace(j.template get<T>());
}
}
#endif // JSON_USE_IMPLICIT_CONVERSIONS
#endif // JSON_HAS_CPP_17
// overloads for basic_json template parameters
template < typename BasicJsonType, typename ArithmeticType,
enable_if_t < std::is_arithmetic<ArithmeticType>::value&&
@ -5162,6 +5184,9 @@ NLOHMANN_JSON_NAMESPACE_END
#include <algorithm> // copy
#include <iterator> // begin, end
#ifdef JSON_HAS_CPP_17
#include <optional> // optional
#endif
#include <string> // string
#include <tuple> // tuple, get
#include <type_traits> // is_same, is_constructible, is_floating_point, is_enum, underlying_type
@ -5663,6 +5688,22 @@ struct external_constructor<value_t::object>
// to_json //
/////////////
#ifdef JSON_HAS_CPP_17
template<typename BasicJsonType, typename T,
enable_if_t<std::is_constructible<BasicJsonType, T>::value, int> = 0>
void to_json(BasicJsonType& j, const std::optional<T>& opt)
{
if (opt.has_value())
{
j = *opt;
}
else
{
j = nullptr;
}
}
#endif
template<typename BasicJsonType, typename T,
enable_if_t<std::is_same<T, typename BasicJsonType::boolean_t>::value, int> = 0>
inline void to_json(BasicJsonType& j, T b) noexcept

90
tests/src/unit-conversions.cpp
View File

@ -28,10 +28,30 @@ using nlohmann::json;
#include <unordered_set>
#include <valarray>
// NLOHMANN_JSON_SERIALIZE_ENUM uses a static std::pair
DOCTEST_CLANG_SUPPRESS_WARNING_PUSH
DOCTEST_CLANG_SUPPRESS_WARNING("-Wexit-time-destructors")
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
#define JSON_HAS_CPP_17
#define JSON_HAS_CPP_14
#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
#define JSON_HAS_CPP_14
#endif
#ifdef JSON_HAS_CPP_17
#if __has_include(<optional>)
#include <optional>
#elif __has_include(<experimental/optional>)
#include <experimental/optional>
#endif
#endif
#if defined(JSON_HAS_CPP_17)
#include <string_view>
#endif
TEST_CASE("value conversion")
{
SECTION("get an object (explicit)")
@ -153,6 +173,7 @@ TEST_CASE("value conversion")
}
#if JSON_USE_IMPLICIT_CONVERSIONS
SECTION("get an object (implicit)")
{
const json::object_t o_reference = {{"object", json::object()},
@ -1569,4 +1590,73 @@ TEST_CASE("JSON to enum mapping")
}
}
#ifdef JSON_HAS_CPP_17
#ifndef JSON_USE_IMPLICIT_CONVERSIONS
TEST_CASE("std::optional")
{
SECTION("null")
{
json j_null;
std::optional<std::string> opt_null;
CHECK(json(opt_null) == j_null);
CHECK(j_null.get<std::optional<std::string>>() == std::nullopt);
}
SECTION("string")
{
json j_string = "string";
std::optional<std::string> opt_string = "string";
CHECK(json(opt_string) == j_string);
CHECK(std::optional<std::string>(j_string) == opt_string);
}
SECTION("bool")
{
json j_bool = true;
std::optional<bool> opt_bool = true;
CHECK(json(opt_bool) == j_bool);
CHECK(std::optional<bool>(j_bool) == opt_bool);
}
SECTION("number")
{
json j_number = 1;
std::optional<int> opt_int = 1;
CHECK(json(opt_int) == j_number);
CHECK(j_number.get<std::optional<int>>() == opt_int);
}
SECTION("array")
{
json j_array = {1, 2, nullptr};
std::vector<std::optional<int>> opt_array = {{1, 2, std::nullopt}};
CHECK(json(opt_array) == j_array);
CHECK(j_array.get<std::vector<std::optional<int>>>() == opt_array);
}
SECTION("object")
{
json j_object = {{"one", 1}, {"two", 2}, {"zero", nullptr}};
std::map<std::string, std::optional<int>> opt_object {{"one", 1}, {"two", 2}, {"zero", std::nullopt}};
CHECK(json(opt_object) == j_object);
CHECK(std::map<std::string, std::optional<int>>(j_object) == opt_object);
}
}
#endif
#endif
#ifdef JSON_HAS_CPP_17
#undef JSON_HAS_CPP_17
#endif
#ifdef JSON_HAS_CPP_14
#undef JSON_HAS_CPP_14
#endif
DOCTEST_CLANG_SUPPRESS_WARNING_POP