Details

LibraryFunction is returned by functions such as LibraryFunctionLoad.
A LibraryFunction object can be used the same way as a pure function.
The function represented by LibraryFunction runs in the same process as the Wolfram Language kernel.
The function represented by LibraryFunction can share data with the Wolfram Language kernel.
Functions in libraries loaded by LibraryFunctionLoad can make callbacks to the Wolfram Language.
The function represented by LibraryFunction is unloaded when the Wolfram Language kernel exits.
LibraryFunctionUnload unloads a LibraryFunction so that it can no longer be used.
The default name of functions declared with LibraryFunctionDeclaration is LibraryFunction["externalName"] for use in compiled code.
LibraryFunction["externalName"] can be used in compiled code to call certain functions from the C standard library.
Information for a LibraryFunction may include the following properties:

	"ArgumentTypes"	types of arguments
	"File"	name of the library file
	"Function"	name of the loaded function
	"ReturnType"	return type of the loaded function

Examples

Load a function from a sample library:

Wolfram Language code: fun = LibraryFunctionLoad["demo", "demo_I_I", {Integer}, Integer]

Call the function:

Wolfram Language code: fun[10]

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