pub fn get_bool<T: AsRef<OsStr>>(name: T) -> Option<bool>Expand description
Gets a boolean environment variable.
Returns None if the variable does not exist or the format is unrecognized.
Note: for optimization reasons, the functions caches values.
The cost of this function is amortized O(1) (thanks to the cache). Once a value is loaded it’s cached to avoid re-loading it. When a value is not loaded the cost of this function is O(nm) with n the number of items in the override path list and m the number of lines in each override file.