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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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2
include/nlohmann/detail/conversions/to_json.hpp
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@@ -267,7 +267,7 @@ struct external_constructor<value_t::object>
#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)
void to_json(BasicJsonType& j, const std::optional<T>& opt) noexcept
{
if (opt.has_value())
{