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Added string_view::contains methods.

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These methods were added in C++23.

Also updated string_view/ref tests:

- Added tests for string_view::contains.
- Added missing includes.
- Added missing std:: qualification.
- Removed tabs.
- Fixed misleading indentation (fixes gcc warnings).
- Fixed decrementing pointer before beginning of the string.

Closes https://github.com/boostorg/utility/issues/93.
This commit is contained in:
Andrey Semashev
2022-05-03 01:26:18 +03:00
parent 0106ffda5f
commit c63d36cf5b
6 changed files with 99 additions and 53 deletions
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22
test/string_view_constexpr_test1.cpp
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@@ -30,12 +30,12 @@ struct constexpr_char_traits
static constexpr bool eq(char_type c1, char_type c2) noexcept { return c1 == c2; }
static constexpr bool lt(char_type c1, char_type c2) noexcept { return c1 < c2; }
static constexpr int compare(const char_type* s1, const char_type* s2, size_t n) noexcept;
static constexpr size_t length(const char_type* s) noexcept;
static constexpr const char_type* find(const char_type* s, size_t n, const char_type& a) noexcept;
static constexpr char_type* move(char_type* s1, const char_type* s2, size_t n) noexcept;
static constexpr char_type* copy(char_type* s1, const char_type* s2, size_t n) noexcept;
static constexpr char_type* assign(char_type* s, size_t n, char_type a) noexcept;
static constexpr int compare(const char_type* s1, const char_type* s2, std::size_t n) noexcept;
static constexpr std::size_t length(const char_type* s) noexcept;
static constexpr const char_type* find(const char_type* s, std::size_t n, const char_type& a) noexcept;
static constexpr char_type* move(char_type* s1, const char_type* s2, std::size_t n) noexcept;
static constexpr char_type* copy(char_type* s1, const char_type* s2, std::size_t n) noexcept;
static constexpr char_type* assign(char_type* s, std::size_t n, char_type a) noexcept;
static constexpr int_type not_eof(int_type c) noexcept { return eq_int_type(c, eof()) ? ~eof() : c; }
static constexpr char_type to_char_type(int_type c) noexcept { return char_type(c); }
@@ -49,7 +49,7 @@ struct constexpr_char_traits
// else, a negative value if, for some j in [0,n), X::lt(s1[j],s2[j]) is true and
// for each i in [0,j) X::eq(s2[i],s2[i]) is true;
// else a positive value.
constexpr int constexpr_char_traits::compare(const char_type* s1, const char_type* s2, size_t n) noexcept
constexpr int constexpr_char_traits::compare(const char_type* s1, const char_type* s2, std::size_t n) noexcept
{
for (; n != 0; --n, ++s1, ++s2)
{
@@ -61,10 +61,10 @@ constexpr int constexpr_char_traits::compare(const char_type* s1, const char_typ
return 0;
}
// yields: the smallest i such that X::eq(s[i],charT()) is true.
constexpr size_t constexpr_char_traits::length(const char_type* s) noexcept
// yields: the smallest i such that X::eq(s[i],charT()) is true.
constexpr std::size_t constexpr_char_traits::length(const char_type* s) noexcept
{
size_t len = 0;
std::size_t len = 0;
for (; !eq(*s, char_type(0)); ++s)
++len;
return len;
@@ -76,7 +76,7 @@ int main()
{
constexpr string_view sv1;
constexpr string_view sv2{"abc", 3}; // ptr, len
constexpr string_view sv3{"def"}; // ptr
constexpr string_view sv3{"def"}; // ptr
constexpr const char *s1 = "";
constexpr const char *s2 = "abc";