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json constructor does not support std::optional #2214
Description
I'm using clang 9.0 which support C++17, but below codes can't pass compile when I use nlohmann::json:
std::optional<int> value;
auto json = nlohmann::json{{"opt", value}};
instead, I have to use below codes:
if (value) {
json = nlohmann::json{{"opt", *value}};
} else {
json = nlohmann::json{{"opt", nullptr}};
}
Activity
dota17 commentedon Jun 24, 2020
Please See #1749 .
There is a PR #2117 , but it didn't merge into
developbecause there are some problems.nlohmann commentedon Jun 24, 2020
Duplicate of #1749.