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Difference Between LET and SET Properties

Set properties can take object as parameter value.But Let can also take variant which can accept object.So what is differnce in LET and SET
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sanjusambhe
Asked:
sanjusambhe
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1 Solution
 
cookreCommented:
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SubodhKatiyarCommented:
let properties are used for changing non object variable types inside class
for example say you have a class with property color which stores the value of color in some local m_var as a long inside class you can use let.
public propery let color(somecolor as long)
m_color=somecolor 'notice this property can only take basic var types
end property
but if you have a connection object inside your class defined as
dim mconn as adodb.connection '(not new connection)
and you want the users of this class to provide their own connection to your class so that you use existing connection of the clients,you will use the set property which is optimized for accepting objects as parameter.
inside the code block for the set property you would do this.
public property set setconn(someconn as adodb.connection)
set  m_conn=someconn 'you just received a object pointer and set it to your obect pheww.
end property

hope it is clear now.
set properties are great i use them extensively for reusing connection objects.

take care
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SubodhKatiyarCommented:
and using variants is an expensive operation you are passing in vt the type of object you want to use and it is dereferenced from there,why would some one pass a pointer inside a variant which would then be reread and vb will find the type o object it has and later on every processing is done using the same route of reading discovering and executing,where as you have one direct way of doing the same.
its like there is if then endif and iif also
different purpose different things.
regards.
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