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    <p>I highly recommend reading "Inside the C++ Object Model" by Stanely B. Lippman for detailed information and some historical backround on how the named return value optimization works.</p> <p>For example, in chapter 2.1 he has this to say about named return value optimization:</p> <blockquote> <p>In a function such as bar(), where all return statements return the same named value, it is possible for the compiler itself to optimize the function by substituting the result argument for the named return value. For example, given the original definition of bar():</p> <pre><code>X bar() { X xx; // ... process xx return xx; } </code></pre> <p>__result is substituted for xx by the compiler:</p> <pre><code>void bar( X &amp;__result ) { // default constructor invocation // Pseudo C++ Code __result.X::X(); // ... process in __result directly return; } </code></pre> <p>(....)</p> <p>Although the NRV optimization provides significant performance improvement, there are several criticisms of this approach. One is that because the optimization is done silently by the compiler, whether it was actually performed is not always clear (particularly since few compilers document the extent of its implementation or whether it is implemented at all). A second is that as the function becomes more complicated, the optimization becomes more difficult to apply. In cfront, for example, the optimization is applied only if all the named return statements occur at the top level of the function. Introduce a nested local block with a return statement, and cfront quietly turns off the optimization.</p> </blockquote>
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    1. POReturn value optimizations and side-effects
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    1. COI agree its confusing and I added the quotes.
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    2. COIt's easier just to mark everything and press Ctrl-Q ;)
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    3. CO@DyP thanks, both for editing and teaching me ;)
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