Standard ML of New Jersey - Features

Features

SML/NJ extends the SML'97 Basis Library with several additional top-level structures:

  • System info – this module provides information about the runtime system, such as the Operating System kind, type and version and whether or not the machine supports multiprocessing.
  • Weak pointers – a weak pointer is one that is not sufficient to keep an object alive. If a heap value is referenced via ordinary pointers then it will remain alive, but if it is only referenced via weak pointers then it will be garbage collected.
  • Lazy suspensions – this module implements the suspensions necessary for lazy evaluation (as opposed to eager evaluation).
  • Compiler internals – SML/NJ provides access to several of the compiler internals, including methods to instantiate and modify the signal table.
  • Unsafe access – these modules provide unsafe access to data structures and runtime-system functions.
  • Compiler modules – SML/NJ also includes a structure that provides control of the ML compiler, which contains substructures for execution profiling, control of compiler error-message printing and warnings, and customizable pretty printing.

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