Provided by: libbobcat-dev_4.08.02-2build1_amd64 
NAME
FBB::Ranger - generalizes ranges for range-based for-loops
SYNOPSIS
#include <bobcat/ranger>
DESCRIPTION
The Ranger class template defines ranges that can be used with range-based for-loops. The
standard range-based for-loop requires for its range-specificiation an array or an
iterator range as offered by, e.g., containers (through their begin and end members).
Ranges defined by a pair of pointers or by a subrange defined by iterator expressions
cannot currently be used in combination with range-based for-loops.
Ranger extends the applicability of range-based for-loops by turning pairs of pointers, an
initial pointer and a pointer count, or a pair of iterators into a range that can be used
by range-based for-loops.
Ranger is a class template requiring one template type parameter: Iterator, an iterator or
pointer type reaching the data when dereferenced.
Ranger’s users don’t have to specify Ranger’s template type. The function template ranger
returns the appropriate Ranger object.
NAMESPACE
FBB
All constructors, members, operators and manipulators, mentioned in this man-page, are
defined in the namespace FBB.
FREE FUNCTION
When using the following free functions, any (subrange) of iterators or pointers can be
used. With iterators subranges of reverse iterators can also be specified. The EXAMPLE
section below illustrates the use of the ranger function templates.
o Ranger<Iterator> ranger(Iterator &&begin, Iterator &&end):
this function template returns a Ranger object for the (sub)range defined by two
(reverse) iterators;
o Ranger<Iterator> ranger(Iterator &&begin, size_t count):
this function template returns a Ranger object for the (sub)range defined by the
(reverse) iterator range begin and begin + count;
o Ranger<Data *> ranger(Data *begin, Data *end):
this function template returns a Ranger object for the (sub)range defined by the
two pointers begin and end;
o Ranger<Data *> ranger(Data *begin, size_t count):
this function template returns a Ranger object for the (sub)range defined by the
two pointers begin and begin + count.
CONSTRUCTORS
Below, Iterator refers to the Ranger class template’s type parameter. Although named
’Iterator’ it can also be a pointer to some data type (e.g., std::string *).
o Ranger(Iterator const &begin, Iterator const &end):
A Ranger object can be passed as range-specifier in a range-based for-loop. All
elements defined by the range will subsequently be visited by the range-based
for-loop. The copy and move constructors are available.
OVERLOADED OPERATORS
The copy and move assignment operators are available.
MEMBER FUNCTIONS
o Iterator const &begin() const:
returns (a copy of) the begin iterator passed to the Ranger’s constructor. Note
that if Iterator was a pointer type (like int *) the data to which the iterator
returned by begin() can actually be modified, as the member’s return type (using
int * for Iterator) becomes int * const &, so a reference to a constant pointer to
an int. This is perfectly OK: if the data themselves should be immutable, then the
data type must be defined as int const, which is automatically the case when
passing int const * data. See the EXAMPLE section for an illustration.
o Iterator const &end() const:
returns (a copy of) the end iterator passed to the Ranger’s constructor. If
reverse iterators are passed to Ranger’s constructor, then the begin and end
members return reverse iterators. Since the intended use of Ranger objects is to
define a range for range-base for-loops, members like rbegin and rend can be
omitted from Ranger.
EXAMPLE
#include <vector>
#include <iostream>
#include <bobcat/ranger>
using namespace std;
using namespace FBB;
int main()
{
vector<int> iv {1, 2, 3, 4, 5};
// display and modify a subrange
for(auto &el: ranger(iv.rbegin() + 1, iv.rend() - 1))
cout << el++ << ’ ’;
cout << ’\n’;
// display a reversed range
for(auto &el: ranger(iv.rbegin() + 1, iv.rend() - 1))
cout << el << ’ ’;
cout << ’\n’;
// same: display using a count
for(auto &el: ranger(iv.rbegin() + 1, 3))
cout << el << ’ ’;
cout << ’\n’;
int intArray[] = {1, 2, 3, 4, 5};
// display and modify elements
// in a pointer-based range
for(auto &el: ranger(intArray + 1, intArray + 3))
cout << el++ << ’ ’;
cout << ’\n’;
// data now modified
for(auto &el: ranger(intArray + 1, intArray + 3))
cout << el << ’ ’;
cout << ’\n’;
// using a count rather than an
// end-pointer
for(auto &el: ranger(intArray + 1, 3))
cout << el << ’ ’;
cout << ’\n’;
int const constInts[] = {1, 2, 3, 4, 5};
// data can’t be modified
for(auto &el: ranger(constInts + 1, constInts + 3))
cout << el << ’ ’;
cout << ’\n’;
}
FILES
bobcat/ranger - defines the class interface
SEE ALSO
bobcat(7)
BUGS
None Reported.
DISTRIBUTION FILES
o bobcat_4.08.02-x.dsc: detached signature;
o bobcat_4.08.02-x.tar.gz: source archive;
o bobcat_4.08.02-x_i386.changes: change log;
o libbobcat1_4.08.02-x_*.deb: debian package holding the libraries;
o libbobcat1-dev_4.08.02-x_*.deb: debian package holding the libraries, headers and
manual pages;
o http://sourceforge.net/projects/bobcat: public archive location;
BOBCAT
Bobcat is an acronym of `Brokken’s Own Base Classes And Templates’.
COPYRIGHT
This is free software, distributed under the terms of the GNU General Public License
(GPL).
AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl).