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CompiledExpressionDeclaration—Wolfram Language Documentation

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• See Also
  • CompilerEnvironmentAppendTo
  • FunctionCompile
  • TypeDeclaration
  • FunctionDeclaration
• Related Guides
  • Compiled Types
  • Code Compilation

• CompiledExpressionDeclaration is a symbolic representation of a declaration and does not evaluate on its own.
• CompiledExpressionDeclaration can be used inside of CompilerEnvironmentAppendTo and the first argument of functions like FunctionCompile.
• When no explicit type name is provided, SymbolName[h] is used.
• When argument types are specified, compiled expressions are internally stored as an efficient product type.
• When argument types are specified, CompiledExpressionDeclaration automatically defines functions including constructors Part and Head.
• When argument types are not specified, compiled expressions are internally stored with "InertExpression".
• When argument types are not specified, test[expr,ty] is used to check whether a given expression expr matches the compiled expression type ty.

Represent a declaration of a type representing expressions of the form foo[_Integer,_Real] but that internally stores the data in a product type:

Compile a function which instantiates and returns an object with the new type:

Represent a declaration of a type representing expressions with the head foo and length 2 and that internally stores the data in an expression:

Compile a function that takes foo as an argument and returns it unchanged:

The function accepts expressions that have the specified structure:

But rejects expressions that do not have the specified structure:

A declaration of a type representing expressions with head foo and that takes any number in its first argument and a Boolean in its second argument:

Compile a function that returns an object with that type:

Note that the return type of the function is parameterized by the type of number that the foo takes in its first argument.

A declaration of a type representing expressions with head foo and that takes any two arguments:

Compile a function that returns an object with that type:

Note that the return type of the function is parameterized by the two argument types. This is equivalent to declaring a compiled expression that has unrestricted type variables in both arguments:

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