Some culpp options should be defined as this about curlpp HOT 1 OPEN

Hi,

this seems to make sense, as seen by this related curl usage example.
But the solution you suggested changes Curlpp interface, and will break builds of other users.
(For CURLOPT_SSL_CTX_FUNCTION, I'm not sure that curlpp option need modification)

I suggest to add an NullableOptionTrait class and to add 2 news options, like :

typedef curlpp::NullableOptionTrait<std::string, CURLOPT_CAINFO> NullableCaInfoOpt;
typedef curlpp::NullableOptionTrait<std::string, CURLOPT_CAPATH> NullableCaPathOpt;

(declare CaInfoOpt and CaPathOpt as obsoletes)

NullableOptionTrait should be able to manage a null value (add en empty ctor and a reset/clear function).

Il you're OK to achieve this, please create a PR.

Thanks for your help,

from curlpp.