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README: adjust boost::optional example

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The "from_json" example for boost::optional is not complete and should also handle the 'none' case.
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Jared Grubb 2017-01-29 02:46:58 +00:00 committed by GitHub
parent f642934b18
commit f2873e6d3a
1 changed files with 3 additions and 1 deletions
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@ -563,7 +563,9 @@ namespace nlohmann {
} }
static void from_json(const json& j, boost::optional<T>& opt) { static void from_json(const json& j, boost::optional<T>& opt) {
if (!j.is_null()) { if (j.is_null()) {
opt = boost::none;
} else {
opt = j.get<T>(); // same as above, but with opt = j.get<T>(); // same as above, but with
// adl_serializer<T>::from_json // adl_serializer<T>::from_json
} }