diff options
Diffstat (limited to 'gcc/vec.h')
| -rw-r--r-- | gcc/vec.h | 50 |
1 files changed, 50 insertions, 0 deletions
@@ -2495,4 +2495,54 @@ make_array_slice (T *base, unsigned int size) # pragma GCC poison m_vec m_vecpfx m_vecdata #endif +/* string_slice inherits from array_slice, specifically to refer to a substring + of a character array. + It includes some string like helpers. */ +class string_slice : public array_slice<const char> +{ +public: + string_slice () : array_slice<const char> () {} + string_slice (const char *str) : array_slice (str, strlen (str)) {} + explicit string_slice (const char *str, size_t len) + : array_slice (str, len) {} + explicit string_slice (const char *start, const char *end) + : array_slice (start, end - start) {} + + friend bool operator== (const string_slice &lhs, const string_slice &rhs) + { + if (!lhs.is_valid () || !rhs.is_valid ()) + return false; + if (lhs.size () != rhs.size ()) + return false; + /* Case where either is a NULL pointer and therefore, as both are valid, + both are empty slices with length 0. */ + if (lhs.size () == 0) + return true; + return memcmp (lhs.begin (), rhs.begin (), lhs.size ()) == 0; + } + + friend bool operator!= (const string_slice &lhs, const string_slice &rhs) + { + return !(lhs == rhs); + } + + /* Returns an invalid string_slice. */ + static string_slice invalid () + { + return string_slice (nullptr, ~0U); + } + + /* tokenize is used to split a string by some deliminator into + string_slice's. Similarly to the posix strtok_r.but without modifying the + input string, and returning all tokens which may be empty in the case + of an empty input string of consecutive deliminators. */ + static string_slice tokenize (string_slice *str, string_slice delims); + + /* Removes white space from the front and back of the string_slice. */ + string_slice strip (); + + /* Compares two string_slices in lexographical ordering. */ + static int strcmp (string_slice str1, string_slice str2); +}; + #endif // GCC_VEC_H |