myfunction.cls

该系统分为数学公式编译器和数值计算两大块,数学公式编译器的实现比较复杂,计算系统的实现是利用编译器调用数学公式进行的

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "CmyFunction"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Option Explicit

Implements USPEXPRESSPARSER.IUSPUserFunction

Private Function IUSPUserFunction_Evaluate(varParameters As Variant) As Double
    
    IUSPUserFunction_Evaluate = 3.14 * varParameters(1) * varParameters(1)
    
End Function

Private Property Get IUSPUserFunction_Name() As String
    IUSPUserFunction_Name = "圆的面积"
End Property

Private Property Get IUSPUserFunction_NParameters() As Long
    IUSPUserFunction_NParameters = 1
End Property