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Add starts_with to basic_string_view. (#3080)

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Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
This commit is contained in:
Vladislav Shchapov 2022-09-04 23:41:16 +05:00 committed by GitHub
parent d59b89e9cd
commit bac53951b8
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2 changed files with 22 additions and 0 deletions
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12
include/fmt/core.h
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@ -486,6 +486,18 @@ template <typename Char> class basic_string_view {
size_ -= n; size_ -= n;
} }
FMT_CONSTEXPR_CHAR_TRAITS bool starts_with(
basic_string_view<Char> sv) const noexcept {
return size_ >= sv.size_ &&
std::char_traits<Char>::compare(data_, sv.data_, sv.size_) == 0;
}
FMT_CONSTEXPR_CHAR_TRAITS bool starts_with(Char c) const noexcept {
return size_ >= 1 && std::char_traits<Char>::eq(*data_, c);
}
FMT_CONSTEXPR_CHAR_TRAITS bool starts_with(const Char* s) const {
return starts_with(basic_string_view<Char>(s));
}
// Lexicographically compare this string reference to other. // Lexicographically compare this string reference to other.
FMT_CONSTEXPR_CHAR_TRAITS auto compare(basic_string_view other) const -> int { FMT_CONSTEXPR_CHAR_TRAITS auto compare(basic_string_view other) const -> int {
size_t str_size = size_ < other.size_ ? size_ : other.size_; size_t str_size = size_ < other.size_ ? size_ : other.size_;

10
test/core-test.cc
View File

@ -70,6 +70,16 @@ TEST(string_view_test, compare) {
EXPECT_LT(string_view("foo").compare(string_view("fop")), 0); EXPECT_LT(string_view("foo").compare(string_view("fop")), 0);
EXPECT_GT(string_view("foo").compare(string_view("fo")), 0); EXPECT_GT(string_view("foo").compare(string_view("fo")), 0);
EXPECT_LT(string_view("fo").compare(string_view("foo")), 0); EXPECT_LT(string_view("fo").compare(string_view("foo")), 0);
EXPECT_TRUE(string_view("foo").starts_with('f'));
EXPECT_FALSE(string_view("foo").starts_with('o'));
EXPECT_FALSE(string_view().starts_with('o'));
EXPECT_TRUE(string_view("foo").starts_with("fo"));
EXPECT_TRUE(string_view("foo").starts_with("foo"));
EXPECT_FALSE(string_view("foo").starts_with("fooo"));
EXPECT_FALSE(string_view().starts_with("fooo"));
check_op<std::equal_to>(); check_op<std::equal_to>();
check_op<std::not_equal_to>(); check_op<std::not_equal_to>();
check_op<std::less>(); check_op<std::less>();