Mercurial > projects > ldc
view dmd2/lstring.h @ 1418:f5f8c21ce6ef
Make "`aa[key]`" use the same runtime call as "`key in aa`". The runtime calls
these were using were different, but with equivalent definitions.
With `ldc -O3`, the following functions now all compile to the exact same code:
{{{
int[int] y;
void foo(int x) {
if (x in y) {
auto z = x in y;
sink(*z);
}
}
void bar(int x) {
if (x in y) {
sink(y[x]);
}
}
void baz(int x) {
if (auto p = x in y) {
sink(*p);
}
}
}}}
author | Frits van Bommel <fvbommel wxs.nl> |
---|---|
date | Mon, 25 May 2009 12:50:40 +0200 |
parents | f04dde6e882c |
children |
line wrap: on
line source
// lstring.h // length-prefixed strings // Copyright (c) 1999-2002 by Digital Mars // All Rights Reserved // written by Walter Bright // www.digitalmars.com // License for redistribution is by either the Artistic License // in artistic.txt, or the GNU General Public License in gnu.txt. // See the included readme.txt for details. #ifndef LSTRING_H #define LSTRING_H 1 #include "dchar.h" struct Lstring { unsigned length; // Disable warning about nonstandard extension #pragma warning (disable : 4200) dchar string[]; static Lstring zero; // 0 length string // No constructors because we want to be able to statically // initialize Lstring's, and Lstrings are of variable size. #if M_UNICODE #define LSTRING(p,length) { length, L##p } #else #define LSTRING(p,length) { length, p } #endif #if __GNUC__ #define LSTRING_EMPTY() { 0 } #else #define LSTRING_EMPTY() LSTRING("", 0) #endif static Lstring *ctor(const dchar *p) { return ctor(p, Dchar::len(p)); } static Lstring *ctor(const dchar *p, unsigned length); static unsigned size(unsigned length) { return sizeof(Lstring) + (length + 1) * sizeof(dchar); } static Lstring *alloc(unsigned length); Lstring *clone(); unsigned len() { return length; } dchar *toDchars() { return string; } hash_t hash() { return Dchar::calcHash(string, length); } hash_t ihash() { return Dchar::icalcHash(string, length); } static int cmp(const Lstring *s1, const Lstring *s2) { int c = s2->length - s1->length; return c ? c : Dchar::memcmp(s1->string, s2->string, s1->length); } static int icmp(const Lstring *s1, const Lstring *s2) { int c = s2->length - s1->length; return c ? c : Dchar::memicmp(s1->string, s2->string, s1->length); } Lstring *append(const Lstring *s); Lstring *substring(int start, int end); }; #endif