Programming Forums > Application Development > C++

JawaKing00 · Aug 31st, 2007, 10:58 AM

I've been programming in C mostly, and I've become accustomed to being able to do things like this:

typedef enum TEST_ENUM_t
{
    TEST0,
    TEST1,
    TEST2,
    TEST3
} TEST_ENUM_t;

TEST_ENUM_t TestIndex;

for (TestIndex = TEST0; TestIndex <= TEST3; TestIndex++)
{
    // Do something
}

Well, now I'm trying to do something like this for some test driver software written in Visual C++ which will be used to test C functions. When I attempt to do something like I have above in Visual C++, I get the following error:

(Toggle Plain Text)

error C2676: binary '++' : 'TEST_ENUM_t' does not define this operator or a conversion to a type acceptable to the predefined operator

Is there a way to do something similar to the code above in Visual C++?

Thank you.

DaWei · Aug 31st, 2007, 12:09 PM

In C an enum is an int. In C++ it is not. It is, in fact, its own datatype. One result of this is that the typedef is no longer required. Another result is that you can no longer perform normal arithmetic on it.

Is there any particular reason that you haven't merely defined TestIndex as an int?

l2u · Sep 2nd, 2007, 9:37 AM

I think it should work if you do something like this:

(Toggle Plain Text)

typedef enum TEST_ENUM_t {
    TEST0 = 0,
    TEST1,
    TEST2,
    TEST3
};

DaWei · Sep 2nd, 2007, 11:30 AM

Doesn't change a thing. TEST0 is, by default, zero.

Aug 31st, 2007, 10:58 AM	#1
JawaKing00 Newbie Join Date: Sep 2004 Posts: 29 Rep Power: 0	Enumerations as loop variables I've been programming in C mostly, and I've become accustomed to being able to do things like this: (Toggle Plain Text) typedef enum TEST_ENUM_t { TEST0, TEST1, TEST2, TEST3 } TEST_ENUM_t; TEST_ENUM_t TestIndex; for (TestIndex = TEST0; TestIndex <= TEST3; TestIndex++) { // Do something } typedef enum TEST_ENUM_t { TEST0, TEST1, TEST2, TEST3 } TEST_ENUM_t; TEST_ENUM_t TestIndex; for (TestIndex = TEST0; TestIndex <= TEST3; TestIndex++) { // Do something } Well, now I'm trying to do something like this for some test driver software written in Visual C++ which will be used to test C functions. When I attempt to do something like I have above in Visual C++, I get the following error: (Toggle Plain Text) error C2676: binary '++' : 'TEST_ENUM_t' does not define this operator or a conversion to a type acceptable to the predefined operator error C2676: binary '++' : 'TEST_ENUM_t' does not define this operator or a conversion to a type acceptable to the predefined operator Is there a way to do something similar to the code above in Visual C++? Thank you.

Aug 31st, 2007, 12:09 PM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	In C an enum is an int. In C++ it is not. It is, in fact, its own datatype. One result of this is that the typedef is no longer required. Another result is that you can no longer perform normal arithmetic on it. Is there any particular reason that you haven't merely defined TestIndex as an int? __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Sep 2nd, 2007, 9:37 AM	#3
l2u Newbie Join Date: Mar 2007 Posts: 24 Rep Power: 0	I think it should work if you do something like this: (Toggle Plain Text) typedef enum TEST_ENUM_t { TEST0 = 0, TEST1, TEST2, TEST3 }; typedef enum TEST_ENUM_t { TEST0 = 0, TEST1, TEST2, TEST3 };

Sep 2nd, 2007, 11:30 AM	#4
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Doesn't change a thing. TEST0 is, by default, zero. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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Programming Forums > Application Development > C++

Enumerations as loop variables