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    <p>The first one is easy:</p> <pre><code>AutoA b_auto_to_a_auto(b_auto); //fails to compile </code></pre> <p>This fails on VC6 since it requires <em>member function templates</em>, something VC6's standard library doesn't support. It compiles on standard-compliant compilers, though.</p> <p>Workaround:</p> <pre><code>AutoA b_auto_to_a_auto( b_auto.release() ); </code></pre> <p>The second one is much more subtle :)</p> <pre><code>sink(b_raw_to_b_auto); //fails to compile </code></pre> <p>This one shouldn't compile on a standards-compliant compiler, because there's an implicit conversion going on. The compiler turns the above into</p> <pre><code>sink( std::auto_ptr&lt;A&gt;( b_raw_to_b_auto ) ); </code></pre> <p>however, <code>sink</code> takes <code>std::auto_ptr&lt;A&gt;</code> <em>by</em> <em>value</em>, so the temporary <code>std::auto_ptr&lt;A&gt;</code> created implicitly by the compiler needs to be <em>copy-constructed</em> into the argument to <code>sink</code>. Now, temporaries like that are <em>rvalues</em>. Rvalues don't bind to non-const references, but <code>std::auto_ptr</code>'s "copy constructor" takes it's argument by <em>non-const</em> reference.</p> <p>There you go - compile error. AFAICS this is standards-conforming behaviour. C++-0x "move semantics" will fix that by adding a "copy constructor" that takes an rvalue reference, though I'm not sure how much love <code>std::auto_ptr</code> will still receive in the future, what with <code>std::shared_ptr</code> and all.</p> <p>Workaround for the second one:</p> <pre><code>AutoA tmp( b_raw_to_b_auto/*.release() for VC6*/ ); sink( tmp ); </code></pre>
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    1. POstd::auto_ptr Compile Issue in Visual Studio 6.0
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    1. USMarc Mutz - mmutz
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    1. COThanks for the answer. I had a feeling it had to do with VC6's templates, I've had issues with it before. I was expecting it was all a problem with VC6, interesting to find out the reasons why not. I didn't know about that rvalues detail, that's good info to know. After getting home, I was able to get the same build results matching what you say conforms to the standard. Thanks everyone else for your replies.
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