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Added hash and comparisons for std::string.

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This commit is contained in:
Cotton Seed 2011-12-29 11:51:58 -05:00
parent e4f420e693
commit 33278ed545
3 changed files with 46 additions and 1 deletions
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10
lib/lib.cpp
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@ -72,3 +72,13 @@ alpha_to_int (char c)
return - (c - 'A' + 1);
}
}
hash_t
hash (const std::string &s)
{
size_t n = s.length ();
hash_t h = hash (n);
for (unsigned i = 0; i < n; i ++)
h = hash_combine (h, hash (s[i]));
return h;
}

17
lib/lib.h
View File

@ -47,6 +47,23 @@ inline hash_t hash (unsigned long x) { return (hash_t)x; }
inline hash_t hash (uint64 x) { return (hash_t)((x >> 32) ^ x); }
hash_t hash (const std::string &s);
inline bool operator == (const std::string &s, const std::string &t)
{
return strcmp (s.c_str (), t.c_str ()) == 0;
}
inline bool operator < (const std::string &s, const std::string &t)
{
return strcmp (s.c_str (), t.c_str ()) < 0;
}
inline bool operator <= (const std::string &s, const std::string &t)
{
return strcmp (s.c_str (), t.c_str ()) <= 0;
}
template<class T>
inline hash_t hash (const T &x)
{

20
main.cpp
View File

@ -143,7 +143,25 @@ main ()
}
#endif
#if 1
map<std::string, int> m;
m.push ("foo", 3);
m.push ("barz", 4);
m.push ("pazazz", 39);
assert (m % "foo");
assert (m("foo") == 3);
assert (! (m % "fop"));
hashmap<std::string, int> m2;
m2.push ("foo", 3);
m2.push ("barz", 4);
m2.push ("pazazz", 39);
assert (m2 % "foo");
assert (m2("foo") == 3);
assert (! (m2 % "fop"));
#if 0
test_ring<Z2> (2);
test_ring<Z> (0);
test_ring<Q> (0);