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Mathematica > Core Language > Expressions > Evaluation Control >

Built-in Mathematica Symbol

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HoldComplete

HoldComplete[expr]
shields expr completely from the standard Mathematica evaluation process, preventing even upvalues associated with expr from being used.

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HoldComplete has attribute HoldAllComplete, and performs no operations on its arguments.

HoldComplete is removed by ReleaseHold. »

HoldComplete can be inserted as a wrapper by such functions as ToExpression and ReplacePart. »

HoldComplete is generated by default by MakeExpression.

Properties & Relations (6)

HoldComplete is the standard container with attribute HoldAllComplete:

No form of evaluation control affects an expression with attribute HoldAllComplete:

Substitution still happens inside HoldComplete:

ReleaseHold removes one level of HoldComplete:

Hold is a milder form of HoldComplete that allows for some form of evaluation:

HoldComplete can be used to freeze the result of ToExpression before it is evaluated:

Possible Issues (1)

HoldComplete affects only evaluation; input transformations are still applied: