This rule is part of MISRA C++:2023.
Usage of this content is governed by Sonar’s terms and conditions. Redistribution is
prohibited.
Rule 8.2.7 - A cast should not convert a pointer type to an integral type
[expr.reinterpret.cast] Implementation 4, 5
Category: Advisory
Analysis: Decidable,Single Translation Unit
Rationale
Casting between a pointer and an integer type makes it harder for tools and developers to understand and reason about code behaviour. For example,
pointer tracking within tools may become unreliable when pointers are cast to integers.
Note: casting between pointers and integers may be unavoidable when addressing memory mapped registers or other hardware specific
features. When the advice given in this rule is not followed, the use of std::uintptr_t or std::intptr_t is required by
M23_369: MISRA C++ 2023 Rule 8.2.8 as these types are guaranteed to be able to represent all possible pointer values.
Example
The following examples violate M23_369: MISRA C++ 2023 Rule 8.2.8:
struct S;
void f( S * s )
{
std::intptr_t p = reinterpret_cast< std::intptr_t >( s ); // Non-compliant
std::uint8_t q = reinterpret_cast< std::uint8_t >( s ); // Non-compliant
}
Copyright The MISRA Consortium Limited © 2023
