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AK: Make the constexpr StringView methods actually constexpr

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Also add some tests to ensure that they _remain_ constexpr.
In general, any runtime assertions, weirdo C casts, pointer aliasing,
and such shenanigans should be gated behind the (helpfully newly added)
AK::is_constant_evaluated() function when the intention is to write
constexpr-capable code.
a.k.a. deliver promises of constexpr-ness :P
This commit is contained in:
Ali Mohammad Pur 2021-06-27 22:41:38 +04:30 • committed by Linus Groh
parent 67d1b28b97
commit 37b0f55104
3 changed files with 41 additions and 4 deletions
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10
AK/StdLibExtras.h
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@ -116,6 +116,15 @@ constexpr decltype(auto) to_underlying(V value) requires(IsEnum<V>)
return static_cast<UnderlyingType<V>>(value);
}
constexpr bool is_constant_evaluated()
{
#if __has_builtin(__builtin_is_constant_evaluated)
return __builtin_is_constant_evaluated();
#else
return false;
#endif
}
}
using AK::array_size;
@ -123,6 +132,7 @@ using AK::ceil_div;
using AK::clamp;
using AK::exchange;
using AK::forward;
using AK::is_constant_evaluated;
using AK::max;
using AK::min;
using AK::RawPtr;