Reference to a pointer to a pointer

This is a discussion on Reference to a pointer to a pointer within the C++ Programming forums, part of the General Programming Boards category; Turn up compiler warnings to level 4. I suspect you will get a warning, since this is a Microsoft extension ...

  1. #16
    C++まいる!Cをこわせ! Elysia's Avatar
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    Turn up compiler warnings to level 4. I suspect you will get a warning, since this is a Microsoft extension (accepting a non-const reference to a temporary).
    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.

  2. #17
    Registered User Sharke's Avatar
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    I can also do this with no warnings:

    Code:
    class X
    {
        int n;
    public:
        X() {}
        void set_n(int nn) {n = nn;}
    };
    
    X f1() {X x; return x;}
    
    void f2(X& x) {X& y = x; y.set_n(5);}
    
    int main() { f2(f1()); }

  3. #18
    Registered User Sharke's Avatar
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    Quote Originally Posted by Elysia View Post
    Turn up compiler warnings to level 4. I suspect you will get a warning, since this is a Microsoft extension (accepting a non-const reference to a temporary).
    Is now my default!

  4. #19
    C++まいる!Cをこわせ! Elysia's Avatar
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    Warning 1 warning C4239: nonstandard extension used : 'argument' : conversion from 'X' to 'X &'
    This is what you should see with the highest warning level.
    If you select to disable language extensions, it will yield a compile error.
    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.

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