Obviously, that should always be used, like also the compiler options for checking integer overflow and accesses out-of-bounds.
However, this kind of implicit conversions must really be forbidden in the standard, because the correct program source is different from the one permitted by the standard.
When you activate most compiler options that detect undefined behaviors, the correct program source remains the same, even if the compiler now implements a better behavior for the translated program than the minimal behavior specified by the standard.
That happens because most undefined behaviors are detected at run time. On the other hand, incorrect implicit conversions are a property of the source code, which is always detected during compilation, so such programs must be rejected.
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Obviously, that should always be used, like also the compiler options for checking integer overflow and accesses out-of-bounds.
However, this kind of implicit conversions must really be forbidden in the standard, because the correct program source is different from the one permitted by the standard.
When you activate most compiler options that detect undefined behaviors, the correct program source remains the same, even if the compiler now implements a better behavior for the translated program than the minimal behavior specified by the standard.
That happens because most undefined behaviors are detected at run time. On the other hand, incorrect implicit conversions are a property of the source code, which is always detected during compilation, so such programs must be rejected.