A C++17-like optional, a nullable object for C++98, C++11 and later in a single-file header-only library
conda install rocketce::optional-liteconda install rocketce/label/rocketce-1.11.5-1::optional-liteconda install rocketce/label/rocketce-1.11.6::optional-liteconda install rocketce/label/rocketce-1.9.1::optional-lite