This rule is part of MISRA C++:2023.
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Rule 4.1.2 - Deprecated features should not be used
[depr]
Category: Advisory
Analysis: Decidable,Single Translation Unit
Amplification
Deprecated features are those identified in Annex D of the C++ Standard, excluding those in [depr.c.headers].
Rationale
Features are deprecated by the C++ Standard when they are superseded by safer or better alternatives, or are considered to exhibit undesirable
behaviour. Features deprecated by a particular version of the C++ Standard may be withdrawn in a later version.
For example:
- The
<codecvt> header was deprecated in C++17; and
- The noexcept-specifier
throw was deprecated in C++17 (and removed in C++20).
Note: use of the C versions of the C++ Standard Library headers ([depr.c.headers]) is not prohibited as these headers provide
features that are equivalent to the ones in the C++ versions.
Example
#include <codecvt> // Non-compliant - [depr.locale.stdcvt]
void foo() throw() // Non-compliant - [depr.except.spec]
{
}
In the following example, the generation of the copy constructor of C1 is deprecated when the destructor is user-declared:
struct C1
{
~C1() = default;
};
C1 c1a {}; // Compliant - no use of copy constructor
C1 c1b { c1a }; // Non-compliant - [depr.impldec]
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