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Fix conversion to std::optional (#4742)

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* ⚗️ remove JSON_USE_IMPLICIT_CONVERSIONS check for from_json(json, std::optional)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* ⚗️ remove JSON_USE_IMPLICIT_CONVERSIONS check for from_json(json, std::optional)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* ⚗️ remove JSON_USE_IMPLICIT_CONVERSIONS check for from_json(json, std::optional)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* ⚗️ remove JSON_USE_IMPLICIT_CONVERSIONS check for from_json(json, std::optional)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* ⚗️ remove JSON_USE_IMPLICIT_CONVERSIONS check for from_json(json, std::optional)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* ⚗️ add C++ standard library as matrix option

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* ⏪ remove inline

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2025-04-15 16:10:39 +02:00
committed by GitHub
parent 4cca3b9cb2
commit 96c1b52f1c
4 changed files with 55 additions and 14 deletions
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11
include/nlohmann/detail/conversions/from_json.hpp
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@@ -13,9 +13,6 @@
#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
@@ -32,6 +29,11 @@
#include <nlohmann/detail/string_concat.hpp>
#include <nlohmann/detail/value_t.hpp>
// include after macro_scope.hpp
#ifdef JSON_HAS_CPP_17
#include <optional> // optional
#endif
NLOHMANN_JSON_NAMESPACE_BEGIN
namespace detail
{
@@ -47,7 +49,6 @@ inline void from_json(const BasicJsonType& j, typename std::nullptr_t& n)
}
#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)
{
@@ -60,8 +61,6 @@ void from_json(const BasicJsonType& j, std::optional<T>& opt)
opt.emplace(j.template get<T>());
}
}
#endif // JSON_USE_IMPLICIT_CONVERSIONS
#endif // JSON_HAS_CPP_17
// overloads for basic_json template parameters