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.NET Forum / .NET Framework / CLR / February 2005Primitive Type Definition
All - Up till now (at least in my opinion) the definition of a primitive type has been at a language level. You can refer to this definition on msdn at ms-help://MS.NETFrameworkSDKv1.1/vblsnet/html/vblrfVBSpec6_2.htm However, in reading Jeffrey Richters book (Applied Microsoft .NET Framework Programming), he mentions the term "CLR primitive values" and illustrates that at the "CLR level", Decimal is not a primitive type. I guess my question is: At what level do we make the decision as to whether a type is a "primitive type"? At both the language and CLR level? Is there another name/term/defintion for "types" that have specific IL instructions that manipulate their values? I'm interested to know what people's opinions are. Thanks. ice > Up till now (at least in my opinion) the definition of a primitive type has > been at a language level. You can refer to this definition on msdn at [quoted text clipped - 10 lines] > > I'm interested to know what people's opinions are. C# defines simple types but not primitive types. (It mentions "primitive" types, but always in quotes as a sort of "you know what I mean here" rather than defining them.) I think the CLR level is really the one it makes sense to define primitive types at.  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet If replying to the group, please do not mail me too > > Up till now (at least in my opinion) the definition of a primitive type has > > been at a language level. You can refer to this definition on msdn at [quoted text clipped - 15 lines] > mean here" rather than defining them.) I think the CLR level is really > the one it makes sense to define primitive types at. Yeah, just saw that in the C# language specification although the VB specification uses "primitive" type. You would think that it would be consistent. Books also use "primitive" type. CLR types can be bifurcated as value types and reference types. Primitive types are some commonly used types like Int32, Single, String, and Boolean are primitive types. These types generally have aliases defined in languages. All primitive types except string are value types. Mujtaba. > > > Up till now (at least in my opinion) the definition of a primitive type > has [quoted text clipped - 25 lines] > specification uses "primitive" type. You would think that it would be > consistent. Books also use "primitive" type. > CLR types can be bifurcated as value types and reference types. Primitive > types are some commonly used types like Int32, Single, String, and Boolean > are primitive types. These types generally have aliases defined in > languages. All primitive types except string are value types. Actually, String isn't a primitive type. From MSDN: <quote> The primitive types are Boolean, Byte, SByte, Int16, UInt16, Int32, UInt32, Int64, UInt64, Char, Double, and Single. </quote> SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet If replying to the group, please do not mail me too so do you consider "decimal" to be a primitive? > CLR types can be bifurcated as value types and reference types. Primitive > types are some commonly used types like Int32, Single, String, and Boolean [quoted text clipped - 33 lines] > > specification uses "primitive" type. You would think that it would be > > consistent. Books also use "primitive" type. > so do you consider "decimal" to be a primitive? No - nor is DateTime, which is probably the next most commonly used value type after the primitives. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet If replying to the group, please do not mail me too so the documentation is wrong or misleading. eb > > so do you consider "decimal" to be a primitive? > > No - nor is DateTime, which is probably the next most commonly used > value type after the primitives. > so the documentation is wrong or misleading. Well, it just means that the VB.NET idea of a primitive type isn't the same as the CLR's idea of a primitive type. That's somewhat confusing, but may well be historical. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet If replying to the group, please do not mail me too > so do you consider "decimal" to be a primitive? u can check it with following code: Dim t As Type = GetType(Decimal) Console.WriteLine("primtive {0}.", t.IsPrimitive) It'll return false for decimal. Ab. Dim t As Type = GetType(String) Console.WriteLine("primtive {0}.", t.IsPrimitive) will display False. Ab. > CLR types can be bifurcated as value types and reference types. Primitive > types are some commonly used types like Int32, Single, String, and Boolean [quoted text clipped - 38 lines] > > specification uses "primitive" type. You would think that it would be > > consistent. Books also use "primitive" type.
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