MISRA.CONV.NUM.NARROWER

Implicit numeric conversion to narrower type.

MISRA-C++ Rule 5-0-6 (required): An implicit integral or floating-point conversion shall not reduce the size of the underlying type.

[Undefined 4.9(1)]

Rationale

An implicit conversion that results in the size of a type being reduced may result in a loss of information.

Example

void f ( )
{
   int32_t s32;
   int16_t s16;
   s16 = s32;                              // Non-compliant
   s16 = static_cast< int16_t > ( s32 );   // Compliant
}