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AK: Implement Span::starts_with()

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Useful for checking for contents at the start of a span.
This commit is contained in:
Valtteri Koskivuori 2021-05-03 21:46:18 +03:00 committed by Linus Groh
parent aacbee8ed8
commit 1069979ddf
2 changed files with 24 additions and 0 deletions
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8
AK/Span.h
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@ -176,6 +176,14 @@ public:
return false;
}
bool constexpr starts_with(Span<const T> other) const
{
if (size() < other.size())
return false;
return TypedTransfer<T>::compare(data(), other.data(), other.size());
}
ALWAYS_INLINE constexpr const T& at(size_t index) const
{
VERIFY(index < this->m_size);

16
Tests/AK/TestSpan.cpp
View file

@ -123,3 +123,19 @@ TEST_CASE(span_from_c_string)
const char* str = "Serenity";
[[maybe_unused]] ReadonlyBytes bytes { str, strlen(str) };
}
TEST_CASE(starts_with)
{
const char* str = "HeyFriends!";
ReadonlyBytes bytes { str, strlen(str) };
const char* str_hey = "Hey";
ReadonlyBytes hey_bytes { str_hey, strlen(str_hey) };
EXPECT(bytes.starts_with(hey_bytes));
const char* str_nah = "Nah";
ReadonlyBytes nah_bytes { str_nah, strlen(str_nah) };
EXPECT(!bytes.starts_with(nah_bytes));
const u8 hey_array[3] = { 'H', 'e', 'y' };
ReadonlyBytes hey_bytes_u8 { hey_array, 3 };
EXPECT(bytes.starts_with(hey_bytes_u8));
}