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<a name="idm75955212752"></a>Description</h4></div></div></div>
<p>A safe type which holds a literal value. This is required to be able
    to initialize other safe types in such a way that an exception code is not
    generated. It is also useful when creating constexpr versions of safe
    types. It contains one immutable value known at compile time and hence can
    be used in any constexpr expression.</p>
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