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remove 'another common example', which doesn't work with VC++, and indent
another example properly git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21442 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -292,8 +292,9 @@ file (note that you very rarely have to include this file directly).</p>
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if (isa<<a href="#Constant">Constant</a>>(V) || isa<<a href="#Argument">Argument</a>>(V) || isa<<a href="#GlobalValue">GlobalValue</a>>(V))
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return true;
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<i>// Otherwise, it must be an instruction...</i>
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return !L->contains(cast<<a href="#Instruction">Instruction</a>>(V)->getParent());
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<i>// Otherwise, it must be an instruction...</i>
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return !L->contains(cast<<a href="#Instruction">Instruction</a>>(V)->getParent());
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}
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</pre>
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<p>Note that you should <b>not</b> use an <tt>isa<></tt> test followed
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@ -322,21 +323,12 @@ file (note that you very rarely have to include this file directly).</p>
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call to <tt>isa<></tt> and a call to <tt>cast<></tt> into one
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statement, which is very convenient.</p>
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<p> Another common example is:</p>
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<pre>
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<i>// Loop over all of the phi nodes in a basic block</i>
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BasicBlock::iterator BBI = BB->begin();
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for (; <a href="#PhiNode">PHINode</a> *PN = dyn_cast<<a href="#PHINode">PHINode</a>>(BBI); ++BBI)
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std::cerr << *PN;
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</pre>
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<p>Note that the <tt>dyn_cast<></tt> operator, like C++'s
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<tt>dynamic_cast</tt> or Java's <tt>instanceof</tt> operator, can be abused.
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In particular you should not use big chained <tt>if/then/else</tt> blocks to
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check for lots of different variants of classes. If you find yourself
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wanting to do this, it is much cleaner and more efficient to use the
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InstVisitor class to dispatch over the instruction type directly.</p>
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<tt>InstVisitor</tt> class to dispatch over the instruction type directly.</p>
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</dd>
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