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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/StringView.h
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@ -24,7 +24,8 @@ public:
: m_characters(characters)
, m_length(length)
{
VERIFY(!Checked<uintptr_t>::addition_would_overflow((uintptr_t)characters, length));
if (!is_constant_evaluated())
VERIFY(!Checked<uintptr_t>::addition_would_overflow((uintptr_t)characters, length));
}
ALWAYS_INLINE StringView(const unsigned char* characters, size_t length)
: m_characters((const char*)characters)
@ -93,7 +94,8 @@ public:
[[nodiscard]] constexpr StringView substring_view(size_t start, size_t length) const
{
VERIFY(start + length <= m_length);
if (!is_constant_evaluated())
VERIFY(start + length <= m_length);
return { m_characters + start, length };
}
@ -158,7 +160,7 @@ public:
[[nodiscard]] StringView substring_view_starting_from_substring(const StringView& substring) const;
[[nodiscard]] StringView substring_view_starting_after_substring(const StringView& substring) const;
bool operator==(const char* cstring) const
constexpr bool operator==(const char* cstring) const
{
if (is_null())
return !cstring;
@ -175,7 +177,7 @@ public:
return !*cp;
}
bool operator!=(const char* cstring) const
constexpr bool operator!=(const char* cstring) const
{
return !(*this == cstring);
}