missing hash function for std::string
>Submitter-Id: net
>Originator: Goswin Brederlow <goswin.brederlow@student.uni-tuebingen.de>
>Organization: The Debian project
>Confidential: no
>Synopsis: missing hash function for std::string
>Severity: serious
>Priority: medium
>Category: libstdc++
>Class: rejects-legal
>Release: 3.0 (Debian GNU/Linux)
>Environment:
System: Debian GNU/Linux (testing/unstable)
Architecture: i686
host: i386-linux
build: i386-linux
target: i386-linux
configured with: ../src/configure -v --enable-languages=c,c++,java,f77,proto,objc --prefix=/usr --infodir=/share/info --mandir=/share/man --enable-shared --with-gnu-as --with-gnu-ld --with-system-zlib --enable-long-long --enable-nls --without-included-gettext --disable-checking --enable-threads=posix --enable-java-gc=boehm --with-cpp-install-dir=bin --enable-objc-gc i386-linux
>Description:
[ Reported to the Debian BTS as report #87063.
Please CC 87063-quiet@bugs.debian.org on replies.
Log of report can be found at http://bugs.debian.org/87063 ]
The STL hash_map does not work with strings. This is because no
hash<string> spezialisation is defined. The code for char* should be
used for strings also.
Heres a testcase:
----------------------------------------------------------------------
#include <ext/hash_map>
#include <string>
using namespace std;
int main() {
hash_map<string, int> myHashMap;
myHashMap["Hallo"] = 42;
}
----------------------------------------------------------------------
[commented by Laurent Bonnaud <Laurent.Bonnaud@inpg.fr>:]
This one is clearly a bug. In the Stroustrup book v3 (not the
definitive reference, but it's the closest thing I have) §17.6.1
explicitely uses a hash_map<string, int> class. Furthermore, §17.6.2.3
discusses about hashing strings.
>How-To-Repeat:
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