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F.21 updated C++17 example

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Sergey Zubkov 2016-07-13 14:53:17 -04:00
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@ -2570,8 +2570,7 @@ With C++11 we can write this, putting the results directly in existing local var
With C++17 we may be able to write something like this, also declaring the variables:
auto { iter, success } = myset.insert("Hello");
if (success) do_something_with(iter);
if (auto [ iter, success ] = myset.insert("Hello"); success) do_something_with(iter);
**Exception**: For types like `string` and `vector` that carry additional capacity, it can sometimes be useful to treat it as in/out instead by using the "caller-allocated out" pattern,
which is to pass an output-only object by reference to non-`const` so that when the callee writes to it the object can reuse any capacity or other resources that it already contains.