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ircd: Add template for constexpr literal overloads.
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1 changed files with 35 additions and 5 deletions
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@ -16,7 +16,10 @@ namespace ircd
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struct string_view;
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constexpr size_t _constexpr_strlen(const char *) noexcept;
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template<size_t N> constexpr size_t _constexpr_strlen(const char (&)[N]) noexcept;
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constexpr bool _constexpr_equal(const char *a, const char *b) noexcept;
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template<size_t N0, size_t N1> constexpr bool _constexpr_equal(const char (&)[N0], const char (&)[N1]) noexcept;
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constexpr const char *data(const string_view &) noexcept;
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constexpr size_t size(const string_view &) noexcept;
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@ -270,17 +273,44 @@ noexcept
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return str.data();
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}
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/// Compile-time comparison of string literals
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///
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template<size_t N0,
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size_t N1>
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constexpr bool
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ircd::_constexpr_equal(const char *a,
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const char *b)
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ircd::_constexpr_equal(const char (&a)[N0],
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const char (&b)[N1])
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noexcept
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{
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if constexpr(_constexpr_strlen(a) != _constexpr_strlen(b))
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return false;
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for(size_t i(0); i < _constexpr_strlen(a); ++i)
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if constexpr(a[i] != b[i])
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return false;
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return true;
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}
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constexpr bool
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ircd::_constexpr_equal(const char *const a,
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const char *const b)
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noexcept
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{
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return *a == *b && (*a == '\0' || _constexpr_equal(a + 1, b + 1));
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}
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[[gnu::pure]]
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template<size_t N>
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constexpr size_t
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ircd::_constexpr_strlen(const char (&a)[N])
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noexcept
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{
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size_t i(0);
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while(i < N)
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if constexpr(a[i] == '\0')
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return i;
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return N;
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}
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constexpr size_t
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ircd::_constexpr_strlen(const char *const s)
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noexcept
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