.TH "FBB::Hash" "3bobcat" "2005\-2023" "libbobcat\-dev_6\&.03\&.02" "Key hashing containers"

.PP 
.SH "NAME"
FBB::Hash \- Various mapping template classes using hashing
.PP 
.SH "SYNOPSIS"
\fB#include <bobcat/hash>\fP
.br 

.PP 
.SH "DESCRIPTION"
The \fBFBB:Hash\fP group of template classes offer hashing\-based
mapping\&. Various variants are available, all based on the facilities offered by
the \fBunordered_map\fP\&.
.PP 
The hash\-map offered in the \fBunordered_map\fP container has a fairly
complex construction interface, and \fIHash\fP is an attempt to simplify this
part of its interface\&. In practice, hashing uses a textual key, which may be
\fBstd::string\fP or \fIchar *\fP based, and the keys may be used either case
sensitively or case insensitively\&. \fIHash\fP merely requires its users to
specify the map\(cq\&s value type, while the key may be a \fIchar const *\fP or
\fIstd::string\fP, used case sensitively or case insensitively\&.
.PP 
.SH "NAMESPACE"
\fBFBB\fP
.br 
All constructors, members, operators and manipulators, mentioned in this
man\-page, are defined in the namespace \fBFBB\fP\&.
.PP 
.SH "INHERITS FROM"
\fBstd::unordered_map\fP, using various instantiations\&.
.PP 
.SH "TYPE"

.PP 
All variants define \fIvalue_type\fP as the corresponding \fIunordered_map
value_type\fP\&. In practice a \fIvalue_type\fP defines a \fIstd::pair<Key, Value>\fP,
where \fIKey\fP represents the hash\(cq\&s key\-type and \fIValue\fP represents the
hash\(cq\&s value type\&.
.PP 
.SH "CONSTRUCTORS"

.PP 
Variants of the \fIFBB::Hash\fP container are available for \fIchar const *\fP
or \fIstd::string\fP keys, used case sensitively or case insensitively\&.
.PP 
All variants support default and move construction (as well as move
assignment), support construction from initializer lists\&. and support
construction from iterators defining a half\-open range of \fIvalue_type\fP
values\&.
.PP 
The following variants are available (showing their default
constructors)\&. \fIValue\fP refers to the value type stored in the hash table\&.
.PP 
.IP o 
\fBHashCharPtr<Value>()\fP:
.br 
this hash table uses \fIcase sensitive\fP \fBchar
const *\fP keys;
.IP 
.IP o 
\fBHashCharCasePtr<Value>()\fP:
.br 
this hash table uses \fIcase insensitive\fP
\fBchar const *\fP keys;
.IP 
.IP o 
\fBHashString<Value>()\fP:
.br 
this hash table uses \fIcase sensitive\fP
\fBstd::string\fP keys;
.IP 
.IP o 
\fBHashStringCase<Value>()\fP:
.br 
this hash table uses \fIcase insensitive\fP
\fBstd::string\fP keys;

.PP 
.SH "OVERLOADED OPERATOR"
In addition to the index operator inherited from \fIunordered_map\fP the
overloaded copy and move assignment operators are available for all \fIHash\fP
containers\&.
.PP 
.SH "MEMBER FUNCTIONS"
All members of the \fIunordered_map\fP container are available, as \fIHash\fP
inherits from this template class\&.
.PP 
.SH "EXAMPLE"
.nf 

    #include <iostream>
    #include <bobcat/hash>

    using namespace std;
    using namespace FBB;

    pair<char const *, size_t> ap[] =
    {
        pair<char const *, size_t>(\(dq\&one\(dq\&, 1),
        pair<char const *, size_t>(\(dq\&two\(dq\&, 2),
    };

    int main()
    {
        HashCharPtr<size_t> hcp;
        HashCharPtr<size_t> hcp2(ap, ap + 2);
        HashCharPtr<size_t> hcp3(hcp2);

        hcp = hcp2;

        cout << hcp2[\(dq\&one\(dq\&] << endl;
    }
        
.fi 

.PP 
.SH "FILES"
\fIbobcat/hash\fP \- defines the class interface
.PP 
.SH "SEE ALSO"
\fBbobcat\fP(7)
.PP 
.SH "BUGS"
None Reported\&.
.PP 
.SH "BOBCAT PROJECT FILES"

.PP 
.IP o 
\fIhttps://fbb\-git\&.gitlab\&.io/bobcat/\fP: gitlab project page;
.IP o 
\fIbobcat_6\&.03\&.02\-x\&.dsc\fP: detached signature;
.IP o 
\fIbobcat_6\&.03\&.02\-x\&.tar\&.gz\fP: source archive;
.IP o 
\fIbobcat_6\&.03\&.02\-x_i386\&.changes\fP: change log;
.IP o 
\fIlibbobcat1_6\&.03\&.02\-x_*\&.deb\fP: debian package containing the
libraries;
.IP o 
\fIlibbobcat1\-dev_6\&.03\&.02\-x_*\&.deb\fP: debian package containing the
libraries, headers and manual pages;

.PP 
.SH "BOBCAT"
Bobcat is an acronym of `Brokken\(cq\&s Own Base Classes And Templates\(cq\&\&.
.PP 
.SH "COPYRIGHT"
This is free software, distributed under the terms of the
GNU General Public License (GPL)\&.
.PP 
.SH "AUTHOR"
Frank B\&. Brokken (\fBf\&.b\&.brokken@rug\&.nl\fP)\&.
.PP