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Delphi Intrinsic Routines

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This topic lists Delphi-only intrinsic routines exposed by the System unit. These intrinsic routines are actually handled by the compiler rather than the run-time library. The table also specifies which compiler support each function

Routine Description DCC32 DCC64 DCCOSX DCCAARM DCCIOSARM DCCIOSARM64 DCCIOS32

System.Abs

Returns an absolute value.

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System.Addr

Returns a pointer to a specified object.

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System.Append

Prepares an existing file for adding text to the end.

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System.Assert

Tests whether a Boolean expression is true.

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System.Assign

Associates the name of an external file with a file variable.

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System.Assigned

Tests for a nil (unassigned) pointer or procedural variable.

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System.AssignFile

Associates the name of an external file with a file variable.

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System.AtomicCmpExchange

AtomicCmpExchange is used for comparing and exchanging memory values.

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System.AtomicDecrement

AtomicDecrement is used for decrementing memory values.

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System.AtomicExchange

AtomicExchange is used for exchanging memory values.

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System.AtomicIncrement

AtomicIncrement is used for incrementing memory values.

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System.BlockRead

Reads one or more records from an open file into a variable.

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System.BlockWrite

Writes one or more records from a variable to an open file.

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System.Break

Causes the flow of control to exit a for, while, or repeat statement.

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System.BuiltInArcTan

Calculates the arctangent of a given number.

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System.BuiltInArcTan2

Calculates the arctangent angle and quadrant of a given number.

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System.BuiltInCos

Calculates the cosine of an angle.

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System.BuiltInLn

Calculates the natural logarithm of a real expression.

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System.BuiltInLnXPlus1

Calculates the natural logarithm of (X+1).

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System.BuiltInLog10

Calculates log base 10.

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System.BuiltInLog2

Calculates log base 2.

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System.BuiltInSin

Calculates the sine of the angle.

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System.BuiltInSqrt

Calculates the square root of X.

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System.BuiltInTan

Calculates the tangent of X.

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System.Chr

Returns the character for a specified ASCII value.

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System.Close

Terminates the association between a file variable and an external file.

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System.CloseFile

Terminates the association between file variable and an external disk file.

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System.Concat

Concatenates two or more strings into one.

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System.Continue

Allows the flow of control to proceed to the next iteration of for, while, or repeat statements.

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System.Copy

Returns a substring of a string or a segment of a dynamic array.

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System.Dec

Decrements a variable by 1 or N.

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System.Delete

Removes a substring from a string.

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System.Dispose

Releases memory allocated for a dynamic variable.

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System.Eof

Tests whether the file position is at the end of a file.

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System.Eoln

Tests whether the file pointer is at the end of a line.

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System.Erase

Deletes an external file.

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System.Exclude

Removes an element from a Delphi set.

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System.Exit

Exits from the current procedure.

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System.Fail

Cancels the construction of an object (Turbo Pascal object model).

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System.FilePos

Returns the current file position.

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System.FileSize

Returns the number of records in a file.

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System.FillChar

Fills contiguous bytes with a specified value.

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System.Finalize

Uninitializes a dynamically allocated variable.

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System.Flush

Empties the buffer of a text file opened for output.

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System.FreeMem

FreeMem frees a memory block.

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System.GetDir

Returns the current directory.

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System.GetMem

GetMem allocates a memory block.

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System.Halt

Initiates abnormal termination of a program.

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System.Hi

Returns the high-order byte of X as an unsigned value.

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System.High

Returns the highest value in the range of an argument.

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System.Inc

Increments an ordinal value by one or N.

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System.Include

Adds an element to a Delphi set.

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System.Initialize

Initializes a dynamically allocated variable.

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System.Insert

Inserts a substring into a string beginning at a specified point.

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System.Length

Returns the number of characters in a string or elements in an array.

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System.Lo

Returns the low order Byte of argument X.

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System.Low

Returns the lowest value in a range.

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System.MemoryBarrier

Enforces an ordering constraint on memory operations.

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System.MulDivInt64

Returns the value of this expression: Int64((Int128(AValue) * Int128(AMul)) div Int128(ADiv)).

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System.New

Creates a new dynamic variable and sets P to point to it.

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System.Odd

Returns true if argument is an odd number.

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System.Ord

Returns the ordinal value of an ordinal-type expression.

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System.Pi

Returns 3.1415926535897932385.

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System.Pred

Returns the predecessor of the argument.

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System.Ptr

Converts a specified address to a pointer.

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System.Read

Read reads data from a file.

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System.Readln

Reads a line of text from a file.

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System.ReallocMem

ReallocMem reallocates a memory block.

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System.Rename

Changes the name of an external file.

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System.Reset

Opens an existing file.

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System.Rewrite

Creates a new file and opens it.

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System.Round

Returns the value of X rounded to the nearest whole number.

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System.RunError

Stops execution and generates a runtime error.

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System.Seek

Moves the current position of a file to a specified component.

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System.SeekEof

Returns the end-of-file status of a file, ignoring whitespace.

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System.SeekEoln

Returns the end-of-line status of a file, ignoring whitespace.

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System.SetLength

Sets the length of a string or dynamic-array variable.

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System.SetString

Sets the contents and length of the given string.

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System.SetTextBuf

Assigns an I/O buffer to a text file.

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System.SizeOf

Returns the number of bytes occupied by a variable or type.

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System.Slice

Returns a sub-section of an array.

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System.Sqr

Returns the square of a number.

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System.Str

Formats a string and returns it to a variable.

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System.Succ

Returns the successor of an argument.

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System.Swap

Exchanges high order byte with the low order byte of an integer or word.

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System.Trunc

Truncates a real number to an integer.

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System.Truncate

Deletes all the records after the current file position.

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System.TypeHandle

Returns the RTTI information for a given type.

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System.TypeInfo

Returns the RTTI information for a given type.

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System.TypeOf

Deprecated routine.

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System.Val

Converts a string to a numeric representation.

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System.VarArrayRedim

Resizes a Variant array.

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System.VarCast

Converts a variant to specified type.

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System.VarClear

Empties a Variant so that it is unassigned.

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System.VarCopy

Copies a Variant to another Variant.

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System.Write

Writes to either a typed file or a text file.

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System.Writeln

Writes to a text file and adds an end-of-line marker.

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