<p>Well, the intention of adding <code>noexcept</code> is to prevent exceptions escaping from C++ into C.  </p>

<p>The REAL problem with exceptions is is when one passes through some C code and back into C++ which catches it and continues to execute.  Who knows what state the data being manipulated by the C code will be in since it will never complete its execution.</p>

<p>If an exception tries to exit a noexcept function its an automatic terminate which tells the programmer they screwed up.</p>

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