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ircd::string_view: Modernize constant evaluation comparisons.

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This commit is contained in:
Jason Volk 2023-03-10 10:55:44 -08:00
parent cefcc75943
commit 527af013f7
1 changed files with 8 additions and 5 deletions
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11
include/ircd/string_view.h
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@ -16,13 +16,13 @@ namespace ircd
struct string_view; struct string_view;
constexpr size_t _constexpr_strlen(const char *) noexcept; constexpr size_t _constexpr_strlen(const char *) noexcept;
template<size_t N> constexpr size_t _constexpr_strlen(const char (&)[N]) noexcept; template<size_t N> consteval size_t _constexpr_strlen(const char (&)[N]) noexcept;
constexpr bool _constexpr_equal(const char *a, const char *b) noexcept; constexpr bool _constexpr_equal(const char *a, const char *b) noexcept;
constexpr bool _constexpr_equal(const char *a, const char *b, size_t) noexcept; constexpr bool _constexpr_equal(const char *a, const char *b, size_t) noexcept;
constexpr bool _constexpr_equal(const char *a, const size_t, const char *b, const size_t) noexcept; constexpr bool _constexpr_equal(const char *a, const size_t, const char *b, const size_t) noexcept;
constexpr bool _constexpr_equal(const string_view &, const string_view &) noexcept; constexpr bool _constexpr_equal(const string_view &, const string_view &) noexcept;
template<size_t N0, size_t N1> constexpr bool _constexpr_equal(const char (&)[N0], const char (&)[N1]) noexcept; template<size_t N0, size_t N1> consteval bool _constexpr_equal(const char (&)[N0], const char (&)[N1]) noexcept;
constexpr const char *data(const string_view &) noexcept; constexpr const char *data(const string_view &) noexcept;
constexpr size_t size(const string_view &) noexcept; constexpr size_t size(const string_view &) noexcept;
@ -327,7 +327,7 @@ noexcept
template<size_t N0, template<size_t N0,
size_t N1> size_t N1>
constexpr bool consteval bool
ircd::_constexpr_equal(const char (&a)[N0], ircd::_constexpr_equal(const char (&a)[N0],
const char (&b)[N1]) const char (&b)[N1])
noexcept noexcept
@ -347,6 +347,9 @@ ircd::_constexpr_equal(const string_view &a,
const string_view &b) const string_view &b)
noexcept noexcept
{ {
if constexpr(__cplusplus >= 202002L)
return a == b;
else
return _constexpr_equal(data(a), size(a), data(b), size(b)); return _constexpr_equal(data(a), size(a), data(b), size(b));
} }
@ -378,7 +381,7 @@ noexcept
} }
template<size_t N> template<size_t N>
constexpr size_t consteval size_t
ircd::_constexpr_strlen(const char (&a)[N]) ircd::_constexpr_strlen(const char (&a)[N])
noexcept noexcept
{ {