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Adding note suggested by @jwakely in #1165

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Andrew Pardoe 2018-03-26 12:03:46 -07:00
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@ -15273,6 +15273,10 @@ of - typically better still - a `const` reference:
Most handlers do not modify their exception and in general we [recommend use of `const`](#Res-const).
##### Note
To rethrow a caught exception use `throw;` not `throw e;`. Using `throw e;` would throw a new copy of `e` (sliced to the static type `std::exception`) instead of rethrowing the original exception of type `std::runtime_error`. (But keep [Don't try to catch every exception in every function](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Re-not-always) and [Minimize the use of explicit `try`/`catch`](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Re-catch) in mind.)
##### Enforcement
Flag by-value exceptions if their types are part of a hierarchy (could require whole-program analysis to be perfect).