Telling what type something is
BlitzMax Forums/BlitzMax Beginners Area/Telling what type something is
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| Hi, i'm wondering if there is a way to tell what type something is, like one universal value that is in all types that differentiate them in some way. This is for use with the Get/SetGNetInt/Float/String commands. Thanks |
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| No there's not an easy way to tell what type a variable is, but if your sending them over the net shouldn't you know what you're sending? |
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You can always add a field to the classes and set the field in the constructor such as:
Type TMyType
Field m_type$
Method New()
m_type$ = "TMyType"
End Method
End Type
Type TMyOtherType Extends TMyType
Method New()
m_type$ = "TMyOtherType"
End Method
End Type
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| There's an example here of how to do it with Types. But it doesn't help for simple data types because int will cast to float and vice versa. |
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Types are easy.type example field a end type type something field a end type local a:example=new example local b:something=new something if example(a)<>null then print "a is of type example" if example(b)<>null then print "b is of type example" if something(a)<>null then print "a is of type something" if something(b)<>null then print "b is of type something" You're casting and checking the outcome. Floats/int/strings, I don't think you can do like this. |
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| thanks, this will be useful in some of my other projects :), but yeah i'm looking for a float/int/string type teller. EDIT: after some thought about it, i developed a way To tell. If anyone can optimize this it would be greatly appreciated var1:String = "blah" var2:Float = 20 var3:Int = 20 If intfloatorstring( var1 ) = 1 Print "it's a string" Else If intfloatorstring( var1 ) = 2 Print "it's a float" Else Print "it's an int" EndIf If intfloatorstring( var2 ) = 1 Print "it's a string" Else If intfloatorstring( var2 ) = 2 Print "it's a float" Else Print "it's an int" EndIf If intfloatorstring( var3 ) = 1 Print "it's a string" Else If intfloatorstring( var3 ) = 2 Print "it's a float" Else Print "it's an int" EndIf Function intfloatorstring:Int( str:String ) For i=33 To 45 If Instr( str , Chr(i) ) Return 1 EndIf Next If Instr( str , Chr(47) ) Return 1 EndIf For i=58 To 122 If Instr( str , Chr(i) ) Return 1 EndIf Next If Instr( str, "." ) For i=0 To 9 If Instr( str, i ) Return 2 EndIf Next Return 1 EndIf Return 3 EndFunction |
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| Just out of curiosity, can you provide an example where this is usefull? You're the second one I see asking for this, and I still can't find a legitimate use. It's obviously usefull to determine the type of an *object* given that a reference can actually point to an instance of any derived type, but for int, float or string, what use do you plan? A variable cannot ever change from being an integer and then a float, and then a string. Also, what if I do Local myString1$ = "1.23" Local myString2$ = "456" If intfloatorstring(myString1) Then ... EndIf If intfloatorstring(myString2) Then ... EndIf |
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| If you can store data as an int or float, why store it as a string? And you can always convert it to a string afterwards. My usage would be purely to use the GNet Commands. GetGNetInt, GetGNetFloat, GetGNetString, SetGNetInt, SetGNetFloat, and SetGNetString. If you are passed an object and you don't know what to store it as over the network, it would be useful to know what type it is supposed to be, or convert a string to whatever is the most efficient data type. Although my solution isn't exactly efficient its just the start to what hopefully could be an answer to telling what type something is. |
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