build: don't use a space in user string literals

This fixes errors in clang-17

ascii.hpp

@@ -189,7 +189,7 @@ namespace cruft::ascii {
 /// The supplied string must have a length that is a multiple of 2.
 std::vector<std::uint8_t>
 inline
-operator"" _hex2u08 (const char *str, size_t len)
+operator""_hex2u08 (const char *str, size_t len)
 {
     CHECK_MOD (len, 2);
     std::vector<uint8_t> res (len/2);
@@ -206,7 +206,7 @@ operator"" _hex2u08 (const char *str, size_t len)
 /// The supplied string must have a length that is a multiple of 2.
 template <typename CharT, CharT ...StrV>
 constexpr auto
-operator"" _hex2array (void)
+operator""_hex2array (void)
 {
     static_assert (sizeof ...(StrV) % 2 == 0);
 

test/hash/fasthash.cpp

@@ -5,17 +5,6 @@
 #include <cinttypes>
 
 
-///////////////////////////////////////////////////////////////////////////////
-std::vector<uint8_t>
-operator"" _u8s (const char *str, size_t len)
-{
-    std::vector<uint8_t> res;
-    res.resize (len);
-    std::copy_n (str, len, std::begin (res));
-    return res;
-}
-
-
 ///////////////////////////////////////////////////////////////////////////////
 int
 main (void)

test/hash/murmur.cpp

@@ -8,7 +8,7 @@
 
 ///////////////////////////////////////////////////////////////////////////////
 std::vector<uint8_t>
-operator"" _u8s (const char *str, size_t len)
+operator""_u8s (const char *str, size_t len)
 {
     std::vector<uint8_t> res;
     res.resize (len);

test/hash/xxhash.cpp

@@ -14,7 +14,7 @@
 
 ///////////////////////////////////////////////////////////////////////////////
 std::vector<uint8_t>
-operator"" _u8s (const char *str, size_t len)
+operator""_u8s (const char *str, size_t len)
 {
     std::vector<uint8_t> res;
     res.resize (len);

utf8.cpp

@@ -37,7 +37,7 @@ struct test {
 
 //-----------------------------------------------------------------------------
 static constexpr test<uint32_t>
-operator"" _test (const char *str, size_t len)
+operator""_test (const char *str, size_t len)
 {
     uint32_t mask = 0;
     uint32_t bits = 0;