Internal Compiler Error

This is a discussion on Internal Compiler Error within the C++ Programming forums, part of the General Programming Boards category; Why would you need to remove a typename? Typename is required when using a dependant type....

  1. #16
    C++まいる!Cをこわせ! Elysia's Avatar
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    Why would you need to remove a typename?
    Typename is required when using a dependant type.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

  2. #17
    Frequently Quite Prolix dwks's Avatar
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    Beats me. I'm the C guy, you're the C++ one.
    Code:
    $ cat rectemp.cpp
    #include <iostream>
    
    using std::cout;
    
    template<int N> struct TemplateTest
    {
            static const int value = typename TemplateTest<N - 1>::value;
    };
    
    template<> struct TemplateTest<0>
    {
            static const int value = 0;
    };
    
    int main()
    {
            cout << TemplateTest<2>::value;
    }
    $ g++ rectemp.cpp -o rectemp
    rectemp.cpp:7: error: expected `(' before ';' token
    $
    dwk

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  3. #18
    The larch
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    Code:
    #include <iostream>
    
    using std::cout;
    
    template<int N> struct TemplateTest
    {
            static const int value = 1 + TemplateTest<N - 1>::value;
    };
    
    template<> struct TemplateTest<0>
    {
            static const int value = 0;
    };
    
    int main()
    {
            cout << TemplateTest<1000>::value;
    }
    +
    -ftemplate-depth-1000
    = success.

    Such things are (should be) configurable.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  4. #19
    C++まいる!Cをこわせ! Elysia's Avatar
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    Well, beats me why it doesn't like the typename keyword. Visual C++ compiles fine either way (but it's known to compile without the typename keyword anyway).
    EDIT: Oh wait, I know. Of course, ::value is static, that's why it's not allowed.
    Last edited by Elysia; 07-04-2008 at 05:32 PM.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

  5. #20
    Master Apprentice phantomotap's Avatar
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    Oh wait, I know. Of course, ::value is static, that's why it's not allowed.
    No. You use 'typename' in that context to tell the language that you expect the nested type to be a type. In the error case it wasn't a type.

    Another fun internal error crash (for GCC and MSVC): use the relevant syntactical sugar--different for each compiler--to pass the address of a method to a template parameter and access that parameter in a context expected of a type. (The source should be flagged as illegal.)

    Soma

  6. #21
    C++まいる!Cをこわせ! Elysia's Avatar
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    Quote Originally Posted by phantomotap View Post
    No. You use 'typename' in that context to tell the language that you expect the nested type to be a type. In the error case it wasn't a type.
    Yes, I realized. The constant is static and a type can't be static.
    If it weren't static, it wouldn't have compiled at all.
    Just shows that I'm not 100% used to advanced template programming yet, but I'm getting there
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

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