package ocaml-base-compiler

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The unit type

compiler-libs.bytecomp
- Bytegen
- Bytelibrarian
- Bytelink
  - Dep
  - DepSet
- Bytepackager
- Compile
- Emitcode
- Errors
- Instruct
- Maindriver
- Printinstr
compiler-libs.common
- Arg_helper
  - Make
    
    S
    
    Key
    
    Map
    
    Value
- Ast_helper
  - Attr
  - Cf
  - Ci
  - Cl
  - Const
  - Csig
  - Cstr
  - Ctf
  - Cty
  - Exp
  - Incl
  - Mb
  - Md
  - Mod
  - Ms
  - Mtd
  - Mty
  - Of
  - Opn
  - Pat
  - Rf
  - Sig
  - Str
  - Te
  - Typ
  - Type
  - Val
  - Vb
- Ast_invariants
- Ast_iterator
- Ast_mapper
- Attr_helper
- Binutils
- Btype
  - For_copy
  - TransientTypeMap
  - TypeHash
  - TypeMap
  - TypePairs
  - TypeSet
- Build_path_prefix_map
- Builtin_attributes
- Bytesections
  - Name
- CamlinternalMenhirLib
  - Convert
    
    Simplified
  - Engine
    
    Make
    
    T
    
    Log
  - EngineTypes
    
    ENGINE
    
    INCREMENTAL_ENGINE_START
    
    MONOLITHIC_ENGINE
    
    TABLE
    
    Log
  - ErrorReports
  - General
  - IncrementalEngine
    
    EVERYTHING
    
    INCREMENTAL_ENGINE
    
    INSPECTION
    
    SYMBOLS
  - InfiniteArray
  - InspectionTableFormat
    
    TABLES
  - InspectionTableInterpreter
    
    Make
    
    E
    
    ET
    
    Log
    
    IT
    
    TT
    
    Symbols
    
    T
  - LexerUtil
  - LinearizedArray
  - PackedIntArray
  - Printers
    
    Make
    
    I
    
    User
  - RowDisplacement
  - StaticVersion
  - TableFormat
    
    TABLES
  - TableInterpreter
    
    MakeEngineTable
    
    Log
    
    T
- Ccomp
- Clflags
- Cmi_format
- Cmt2annot
- Cmt_format
- Compenv
- Compile_common
- Compmisc
- Compression
- Config
- Consistbl
  - Make
    
    Module_name
    
    Map
    
    Set
    
    Tbl
- Ctype
- Datarepr
- Debuginfo
  - Scoped_location
- Depend
- Diffing
  - Define
    
    D
    
    Left_variadic
    
    _
    
    Parameters
    
    Right_variadic
    
    _
    
    S
    
    Simple
    
    _
  - Defs
- Diffing_with_keys
  - Define
    
    D
    
    Parameters
    
    Simple
    
    _
- Dll
- Docstrings
  - WithMenhir
- Domainstate
- Env
- Envaux
- Errortrace
  - Subtype
- Ident
  - Map
  - Set
  - T
  - Tbl
- Identifiable
  - Make
    
    Map
    
    Set
    
    T
    
    Tbl
  - Map
    
    T
  - Pair
    
    A
    
    B
  - S
    
    Map
    
    Set
    
    T
    
    Tbl
  - Set
    
    T
  - Tbl
    
    T
  - Thing
- Includeclass
- Includecore
- Includemod
- Includemod_errorprinter
- Int_replace_polymorphic_compare
- Lambda
- Lazy_backtrack
- Lexer
- Load_path
  - Dir
- Local_store
- Location
- Longident
- Main_args
- Makedepend
- Matching
- Meta
- Misc
  - Color
  - Error_style
  - Int_literal_converter
  - LongString
  - Magic_number
  - Stdlib
    
    Array
    
    List
    
    Option
    
    String
    
    Map
    
    Set
    
    Tbl
- Mtype
- Numbers
  - Float
    
    Map
    
    Set
    
    T
    
    Tbl
  - Int
    
    Map
    
    Set
    
    T
    
    Tbl
  - Int16
  - Int8
- Opcodes
- Oprint
- Parmatch
  - Compat
    
    _
- Parse
- Parser
  - Incremental
  - MenhirInterpreter
- Path
  - Map
  - Set
- Patterns
  - General
  - Half_simple
  - Head
  - Non_empty_row
  - Simple
- Persistent_env
  - Consistbl
  - Persistent_signature
- Pparse
- Pprintast
- Predef
- Primitive
- Printast
- Printlambda
- Printpat
- Printtyp
- Printtyped
- Profile
- Rec_check
- Runtimedef
- Shape
  - Item
    
    Map
  - Make_reduce
    
    Context
  - Map
  - Sig_component_kind
  - Uid
    
    Map
    
    Set
    
    T
    
    Tbl
- Signature_group
- Simplif
- Strongly_connected_components
  - Make
    
    Id
    
    Map
    
    Set
    
    T
    
    Tbl
  - S
    
    Id
    
    Map
    
    Set
    
    T
    
    Tbl
- Stypes
- Subst
  - Lazy
- Switch
  - CtxStore
    
    A
  - CtxStored
  - Make
    
    Arg
  - S
  - Store
    
    A
  - Stored
- Symtable
- Syntaxerr
- Targetint
- Tast_iterator
- Tast_mapper
- Terminfo
- Tmc
- Translattribute
- Translclass
- Translcore
- Translmod
- Translobj
- Translprim
- Type_immediacy
  - Violation
- Typeclass
- Typecore
  - Datatype_kind
- Typedecl
- Typedecl_immediacy
- Typedecl_properties
- Typedecl_separability
- Typedecl_unboxed
- Typedecl_variance
- Typedtree
- Typemod
  - Sig_component_kind
  - Signature_names
- Typeopt
- Types
  - MethSet
  - Meths
  - Separability
  - TransientTypeOps
  - Transient_expr
  - VarSet
  - Variance
  - Vars
- Typetexp
  - TyVarEnv
- Untypeast
- Warnings
compiler-libs.optcomp
- Afl_instrument
- Alias_analysis
- Allocated_const
- Arch
- Asmgen
- Asmlibrarian
- Asmlink
- Asmpackager
- Augment_specialised_args
  - Definition
  - Make
    
    _
  - S
  - What_to_specialise
- Backend_var
  - Provenance
  - With_provenance
- Branch_relaxation
  - Make
    
    T
    
    Cond_branch
- Build_export_info
- CSE
- CSEgen
  - cse_generic
- Clambda
- Clambda_primitives
- Closure
- Closure_conversion
- Closure_conversion_aux
  - Env
  - Function_decls
    
    Function_decl
- Closure_element
  - Map
  - Set
  - T
  - Tbl
- Closure_id
  - Map
  - Set
  - T
  - Tbl
- Closure_middle_end
- Closure_offsets
- Closure_origin
  - Map
  - Set
  - T
  - Tbl
- Cmm
- Cmm_helpers
- Cmm_invariants
- Cmmgen
- Cmmgen_state
- Coloring
- Comballoc
- Compilation_unit
  - Map
  - Set
  - T
  - Tbl
- Compilenv
- Convert_primitives
- Dataflow
  - Backward
    
    D
  - DOMAIN
- Deadcode
- Effect_analysis
- Emit
- Emitaux
- Export_id
  - Map
  - Set
  - T
  - Tbl
- Export_info
- Export_info_for_pack
- Extract_projections
- Find_recursive_functions
- Flambda
  - Constant_defining_value
    
    Map
    
    Set
    
    T
    
    Tbl
  - With_free_variables
- Flambda_invariants
- Flambda_iterators
- Flambda_middle_end
- Flambda_to_clambda
- Flambda_utils
  - Switch_storer
- Freshening
  - Project_var
- Id_types
  - BaseId
  - Id
  - UnitId
    
    Compilation_unit
    
    _
- Import_approx
- Inconstant_idents
- Initialize_symbol_to_let_symbol
- Inline_and_simplify
- Inline_and_simplify_aux
  - Env
  - Result
- Inlining_cost
- Inlining_decision
- Inlining_stats
  - Closure_stack
- Inlining_stats_types
- Inlining_transforms
- Interf
- Internal_variable_names
- Interval
- Invariant_params
- Lift_code
- Lift_constants
- Lift_let_to_initialize_symbol
- Linear
- Linear_format
- Linearize
- Linkage_name
  - Map
  - Set
  - T
  - Tbl
- Linscan
- Liveness
- Mach
- Mutable_variable
  - Map
  - Set
  - T
  - Tbl
- Optcompile
- Opterrors
- Optmaindriver
- Parameter
  - List
  - Map
  - Set
  - T
  - Tbl
- Pass_wrapper
- Polling
- Printclambda
- Printclambda_primitives
- Printcmm
- Printlinear
- Printmach
- Proc
- Projection
  - Map
  - Set
  - T
  - Tbl
- Ref_to_variables
- Reg
  - Map
  - Raw_name
  - Set
- Reload
- Reloadgen
  - reload_generic
- Remove_free_vars_equal_to_args
- Remove_unused_arguments
- Remove_unused_closure_vars
- Remove_unused_program_constructs
- Schedgen
  - scheduler_generic
- Scheduling
- Selectgen
- Selection
- Semantics_of_primitives
- Set_of_closures_id
  - Map
  - Set
  - T
  - Tbl
- Set_of_closures_origin
  - Map
  - Set
  - T
  - Tbl
- Share_constants
- Simple_value_approx
- Simplify_boxed_integer_ops
- Simplify_common
- Simplify_primitives
- Spill
- Split
- Static_exception
  - Map
  - Set
  - T
  - Tbl
- Strmatch
  - I
  - Make
    
    _
- Symbol
  - Map
  - Set
  - T
  - Tbl
- Tag
  - Map
  - Set
  - T
  - Tbl
- Traverse_for_exported_symbols
- Un_anf
- Unbox_closures
- Unbox_free_vars_of_closures
- Unbox_specialised_args
- Var_within_closure
  - Map
  - Set
  - T
  - Tbl
- Variable
  - Map
  - Pair
    
    Map
    
    Set
    
    T
    
    Tbl
  - Set
  - T
  - Tbl
- X86_dsl
  - D
  - I
- X86_gas
- X86_masm
- X86_proc
compiler-libs.toplevel
- Genprintval
  - EVALPATH
  - Make
    
    O
    
    _
  - OBJ
  - S
- Topcommon
- Topdirs
- Topeval
- Toploop
- Topmain
- Topprinters
- Trace
dynlink
- Dynlink
runtime_events
- Runtime_events
  - Callbacks
  - Timestamp
  - Type
  - User
str
- Str
threads
- Event
- Thread
unix
- Unix
  - LargeFile
- UnixLabels
  - LargeFile

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Class type

Unit values.

since 4.08

The unit type

type t = unit =

| ()

The unit type.

The constructor () is included here so that it has a path, but it is not intended to be used in user-defined data types.

val equal : t -> t -> bool

equal u1 u2 is true.

val compare : t -> t -> int

compare u1 u2 is 0.

val to_string : t -> string

to_string b is "()".