Read-only record type containing the lib's configuration options

Type of functions with optional arguments for setting each of t's fields, similarly named, and returning 'a

The default values of the options to use at startup

Use to update any option in a t, using the optional arguments of options_fun. E.g. set opts ?option1:1 ?option4:"x" ()

Same as set, but passes the result to a continuation, allowing argument stacking

The global reference containing the currently set library options. Access using OpamXxxConfig.(!r.field).

Updates the currently set options in r according to the optional arguments

Sets the options, reading the environment to get default values when unspecified

Sets the options like init, but returns the given value (for arguments stacking)