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<a href="https://gitlab.com/rockdaboot">Tim Rühsen</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/1151#note_276085450">lib/hello_ext.c</a>:
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="c"> <span class="n" style="color: #333;">hello_ext_ctx_st</span> <span class="n" style="color: #333;">ctx</span><span class="p">;</span></span>
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<td class="diff-line-num old_line" data-linenumber="297" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="c"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">&=</span> <span class="n" style="color: #333;">GNUTLS_EXT_FLAG_SET_ONLY_FLAGS_MASK</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="c"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">&=</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">gnutls_ext_flags_t</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">GNUTLS_EXT_FLAG_SET_ONLY_FLAGS_MASK</span><span class="p">;</span></span>
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<p dir="auto">No - we need enum type safety here. <code>gnutls_ext_flags_t</code> is a collection of some single bit values. <code>GNUTLS_EXT_FLAG_SET_ONLY_FLAGS_MASK</code> is <em>not</em> a <code>gnutls_ext_flags_t</code>. Since an enum has no fixed type (every compiler is free to use any integer type, signed or unsigned), we'll either need this cast <em>or</em> we have to make <code>GNUTLS_EXT_FLAG_SET_ONLY_FLAGS_MASK</code> a <code>gnutls_ext_flags_t</code>.</p>
<p dir="auto">I chose the first possibility. If you like the second possibility more, I can change it (but fear it will become even more strange). Using unsigned int for <code>msg</code> doesn't really help here.</p>
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