An extensible math expression parser with plug-ins

// MTPluginIDL.idl : IDL source for MTPluginIDL.dll
//

// This file will be processed by the MIDL tool to
// produce the type library (MTPluginIDL.tlb) and marshalling code.

import "oaidl.idl";
import "ocidl.idl";
	[
		object,
		uuid(C4DAF5B0-EE0F-4014-89E6-948FB9F79B85),
		dual,
		helpstring("IMTPlugin Interface"),
		pointer_default(unique)
	]
	interface IMTPlugin : IDispatch
	{
		[id(1), helpstring("method getNbConsts")] HRESULT getNbConsts([out] int *pNbConsts);
		[id(2), helpstring("method getConst")] HRESULT getConst([in] int id, [out] BSTR *name, [out] double *pVal);
		[id(3), helpstring("method getNbFuncs")] HRESULT getNbFuncs([out] int *pNbFuncs);
		[id(4), helpstring("method getFuncSymbol")] HRESULT getFuncSymbol([in] int id, [out] BSTR *symbol);
		[id(5), helpstring("method getFuncHelpString")] HRESULT getFuncHelpString([in] int id, [out] BSTR *helpString);
		[id(6), helpstring("method getFuncDescription")] HRESULT getFuncDescription([in] int id, [out] BSTR *description);
		[id(7), helpstring("method isFuncConstant")] HRESULT isFuncConstant([in] int id, [out] int *pConstant);
		[id(8), helpstring("method getFuncNbArgs")] HRESULT getFuncNbArgs([in] int id, [out] int *pNbArgs);
		[id(9), helpstring("method evaluateFunc")] HRESULT evaluateFunc([in] int id, [in] int nbArgs, [in, size_is (nbArgs)] const double *pArg, [out] double *pResult);
		[id(10), helpstring("method getNbOps")] HRESULT getNbOps([out] int *pNbOps);
		[id(11), helpstring("method getOpPrecedence")] HRESULT getOpPrecedence([in] int id, [out] int *pPrecedence);
		[id(12), helpstring("method isOpConstant")] HRESULT isOpConstant([in] int id, [out] int *pConstant);
		[id(13), helpstring("method getOpSymbol")] HRESULT getOpSymbol([in] int id, [out] BSTR *symbol);
		[id(14), helpstring("method getOpHelpString")] HRESULT getOpHelpString([in] int id, [out] BSTR *helpString);
		[id(15), helpstring("method getOpDescription")] HRESULT getOpDescription([in] int id, [out] BSTR *description);		
		[id(16), helpstring("method isOneArgOp")] HRESULT isOneArgOp([in] int id, [out] int *pOneArg);
		[id(17), helpstring("method evaluateOp")] HRESULT evaluateOp([in] int id, [in] int nbArgs, [in, size_is (nbArgs)] const double *pArg, [out] double *pResult);
	};

[
	uuid(5291C973-5DC2-4D1D-B980-4C6A3A94433D),
	version(1.0),
	helpstring("MTPluginIDL 1.0 Type Library")
]
library MTPLUGINIDLLib
{
	importlib("stdole32.tlb");
	importlib("stdole2.tlb");

	[
		uuid(E58C85C4-DF60-49B4-AB82-B44CE7E9C348),
		helpstring("MTPlugin Class")
	]
	coclass MTPlugin
	{
		[default] interface IMTPlugin;
	};
};