This rule is part of MISRA C++:2023.
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Rule 5.13.5 - The lowercase form of L shall not be used as the first character in a literal suffix
Category: Required
Analysis: Decidable,Single Translation Unit
Amplification
This rule does not apply to _user-defined-literal_s.
Rationale
Using the uppercase suffix L removes the potential ambiguity between 1 (digit 1) and l (lowercase
L) when declaring numeric literals. The ambiguity only occurs when lowercase L is used as the first letter of a suffix.
Example
int64_t const a = 0L; // Compliant
int64_t const b = 0l; // Non-compliant
uint64_t const c = 1Lu; // Compliant
uint64_t const d = 1lU; // Non-compliant
uint64_t const e = 2uLL; // Compliant
uint64_t const f = 2Ull; // Compliant
long long const g = 3LL; // Compliant
long long const h = 3ll; // Non-compliant
long double const i = 1.2L; // Compliant
long double const j = 3.4l; // Non-compliant
constexpr Litre operator"" _l( long double val ) noexcept
{
return Litre { val }; // Assumes type Litre is defined
}
auto volume = 42.1_l; // Rule does not apply
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