eLxr packages [ bianca ]
[ 源代码： tl-optional ]
软件包：libtl-optional-dev（1.1.0-2）
C++11/14/17 std::optional with functional-style extensions
std::optional is the preferred way to represent an object which may or may not have a value. Unfortunately, chaining together many computations which may or may not produce a value can be verbose, as empty-checking code will be mixed in with the actual programming logic. This implementation provides a number of utilities to make coding with optional cleaner.