mod
generalisation of mod to any instance of Real
Lm: Letter, Modifier
Sk: Symbol, Modifier
Catch any IOError that occurs in the computation and throw a modified version.
Mutate the contents of an IORef
A slight variation on modifyMVar_ that allows a value to be returned (b) in addition to the modified value of the MVar.
A safe wrapper for modifying the contents of an MVar. Like withMVar, modifyMVar will replace the original contents of the MVar if an exception is raised during the operation.
Mutate the contents of an STRef
Rendering mode.
Rendering mode.
The rendering mode
The modelview matrix stack of the specified vertex unit.
Time of last modification.
The state of the keyboard modifiers
modify f is an action that updates the state to the result of applying f to the current state.
* f = get >>= (put .
>
modify f is an action that updates the state to the result of applying f to the current state.
* f = get >>= (put .
>
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