clang++ works but g++ doesn't -- Maybe a compiler bug?

This is a discussion on clang++ works but g++ doesn't -- Maybe a compiler bug? within the C++ Programming forums, part of the General Programming Boards category; clang++ can compile the following code without any error and warning, but g++ always gives me the error "no matching ...

  1. #1
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    Exclamation clang++ works but g++ doesn't -- Maybe a compiler bug?

    clang++ can compile the following code without any error and warning, but g++ always gives me the error "no matching call ..."? Is it a bug of g++ or kind of extensions of clang++?
    Code:
    #include <algorithm> 
    
    int main() 
    { 
        struct utils 
        { 
            struct int_type 
            { 
                int m_value; 
            }; 
    
            static int_type& transform_predicate(int_type& x) 
            { 
                x.m_value += 1; 
                return x; 
            } 
        }; 
        static utils::int_type array[1048576]; 
        int i; 
    
        for(i = 0; i < 1048576; i++) 
            array[i].m_value = i; 
    
        std::transform(array, array + 1048576, array, utils::transform_predicate); 
        return 0; 
    }

  2. #2
    C++ Witch laserlight's Avatar
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    Comeau reports several errors concerning "a template argument may not reference a local type".
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
    and the Hat of Guessing tabstop's Avatar
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    Looks like you have one line out of place:
    Code:
    #include <algorithm> 
    
    struct utils 
        { 
            struct int_type 
            { 
                int m_value; 
            }; 
    
            static int_type& transform_predicate(int_type& x) 
            { 
                x.m_value += 1; 
                return x; 
            } 
        }; 
    
    int main() 
    { 
        
         utils::int_type array[1048576]; 
        int i; 
    
        for(i = 0; i < 1048576; i++) 
            array[i].m_value = i; 
    
        std::transform(array, array + 1048576, array, utils::transform_predicate); 
        return 0; 
    }
    works fine.

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