Mixing
nlohmann json has a string member called name, how can I check it is null or valid string
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}
I know that I have this:
json var["thirdName"].get<std::string>().c_str();
It is used in C++. The protocol says this member is mandatory, but lots of people don't have third name.
I got exception if it is
nullptr;
, because I can say
var["thirdName"] = nullptr;
How can I easily check if it is valid or not?
I've found only one very complex form.
linux c++14 nullptr nlohmann-json
asked Jan 3 at 12:52
TamasTamas
123
add a comment |
I know that I have this:
json var["thirdName"].get<std::string>().c_str();
It is used in C++. The protocol says this member is mandatory, but lots of people don't have third name.
I got exception if it is
nullptr;
, because I can say
var["thirdName"] = nullptr;
How can I easily check if it is valid or not?
I've found only one very complex form.
linux c++14 nullptr nlohmann-json
asked Jan 3 at 12:52
TamasTamas
123
add a comment |
I know that I have this:
json var["thirdName"].get<std::string>().c_str();
It is used in C++. The protocol says this member is mandatory, but lots of people don't have third name.
I got exception if it is
nullptr;
, because I can say
var["thirdName"] = nullptr;
How can I easily check if it is valid or not?
I've found only one very complex form.
linux c++14 nullptr nlohmann-json
asked Jan 3 at 12:52
TamasTamas
123
I know that I have this:
json var["thirdName"].get<std::string>().c_str();
It is used in C++. The protocol says this member is mandatory, but lots of people don't have third name.
I got exception if it is
nullptr;
, because I can say
var["thirdName"] = nullptr;
How can I easily check if it is valid or not?
I've found only one very complex form.
linux c++14 nullptr nlohmann-json
linux c++14 nullptr nlohmann-json
asked Jan 3 at 12:52
TamasTamas
123
asked Jan 3 at 12:52
TamasTamas
123
asked Jan 3 at 12:52
TamasTamas
123
asked Jan 3 at 12:52
TamasTamas
123
asked Jan 3 at 12:52
TamasTamas
123
123
add a comment |
add a comment |
1 Answer
1
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oldest
votes
You can use the count method:
if (var.count("thirdName") > 0) {
...
}
Personally, I would omit the > 0:
if (var.count("thirdName")) {
...
}
answered Jan 3 at 12:55
mrksmrks
4,7401938
add a comment |
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1 Answer
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1 Answer
1
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oldest
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active
oldest
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active
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votes
You can use the count method:
if (var.count("thirdName") > 0) {
...
}
Personally, I would omit the > 0:
if (var.count("thirdName")) {
...
}
answered Jan 3 at 12:55
mrksmrks
4,7401938
add a comment |
You can use the count method:
if (var.count("thirdName") > 0) {
...
}
Personally, I would omit the > 0:
if (var.count("thirdName")) {
...
}
answered Jan 3 at 12:55
mrksmrks
4,7401938
add a comment |
You can use the count method:
if (var.count("thirdName") > 0) {
...
}
Personally, I would omit the > 0:
if (var.count("thirdName")) {
...
}
answered Jan 3 at 12:55
mrksmrks
4,7401938
You can use the count method:
if (var.count("thirdName") > 0) {
...
}
Personally, I would omit the > 0:
if (var.count("thirdName")) {
...
}
answered Jan 3 at 12:55
mrksmrks
4,7401938
answered Jan 3 at 12:55
mrksmrks
4,7401938
answered Jan 3 at 12:55
mrksmrks
4,7401938
answered Jan 3 at 12:55
mrksmrks
4,7401938
4,7401938
add a comment |
add a comment |
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