Provided by: libbobcat-dev_6.06.02-1_amd64 
NAME
FBB::Mbuf - std::streambuf handling messages
SYNOPSIS
#include <bobcat/mbuf>
Linking option: -lbobcat
DESCRIPTION
Objects of this class are derived from std::streambuf, and are used to handle messages in a standardized
way. Messages may be prefixed with order (line) numbers and/or labels.
By default all messages are inserted into the standard output stream, but other destinations (standard
error, a named file, etc.) can easily be configured.
FBB::Mbuf objects themselves are std::streambuf objects, so they can be used to construct std::ostream
objects. However, they are intended to be used by mstream(3bobcat) objects, and passing Mbuf objects to
other kind of ostream objects is deprecated and results in undefined behavior.
NAMESPACE
FBB
All elements mentioned in this man-page, are defined in the namespace FBB.
INHERITS FROM
std::streambuf
CONSTRUCTORS
o Mbuf():
The default constructor handles messages using the std::streambuf also used by std::cout. There is
no limit to the number of messages that may be inserted. No message or line numbers are shown, no
exception are thrown when inserting messages.
o explicit Mbuf(std::streambuf *buf, size_t maxCount = std::numeric_limits<size_t>::max(),
std::string const &tag = "", bool throwing = false):
This constructor uses buf to handle messages. By default (using the default argument values) there
is no limit to the number of messages that may be inserted. No message or line numbers are shown,
no exception are thrown when inserting messages. Specifying any other value than
std::numeric_limits<size_t>::max() sets the maximum number of messages that can be inserted to
that value. The tag defines the text of the message label (e.g., Error). When throwing is
specified as true an FBB::Exception exception is thrown after completing a message. The generated
exception holds the id (see below for the member id) of the FBB::Mbuf object from which the
exception was thrown as well as the text FBB::Mbuf.
o explicit Mbuf(std::string const &name, size_t maxCount = std::numeric_limits<size_t>::max(),
std::string const &tag = "", bool throwing = false):
This constructor creates a std::ofstream from the provided name parameter that receives the
messages handled by the constructed FBB:Mbuf object. It throws an FBB::Exception exception if the
stream cannot be opened for writing. If a file by that name already exists it is rewritten. The
remaining parameters are identical to those of the previous two constructors.
Copy and move constructors (and assignment operators) are not available.
MEMBER FUNCTIONS
o size_t count() const:
returns the number of inserted messages (if setCount has been called: the value set by the last
setCount call plus the number of inserted messages since that call).
o bool lineExcess() const:
returns true after attempting to insert an additional message after maxCount() number of messages
have been inserted.
o std::string const &lineTag() const:
returns the currently used line-tag (by default `Line’).
o size_t maxCount() const:
returns the maximum number of messages that can be inserted. If the returned value equals
std::numeric_limits<size_t>::max() then there is no limit to the number of messages that can be
inserted.
o void noLineNr():
calling this member will suppress the display of a line number if it is called after calling
setLineNr (see below) but before a message is being (or has been) inserted.
o void reset(std::streambuf *buf, size_t maxCount, std::string const &tag, bool throwing):
messages inserted into FBB::Mbuf objects are handled by std::streambuf buf. By specifying
std::numeric_limits<size_t>::max() for maxCount there is no limit to the number of messages that
may be handled by this std::streambuf. The tag defines the text of the message label (e.g., Error
or the empty string for no message label). When throwing is specified as true an FBB::Exception
exception is thrown after completing a message.
o void reset(std::string const &name, size_t maxCount, std::string const &tag, bool throwing):
messages inserted into FBB::Mbuf objects are handled by a std::ofstream created using the provided
name parameter. It throws an FBB::Exception exception if the stream cannot be opened for writing.
If a file by that name already exists it is rewritten. The remaining parameters are identical to
those of the previous reset members.
o void reset(FBB::Mbuf const &mbuf):
the current object is reset using the parameters of the mbuf parameter. Following the reset all of
the current object’s parameters can independently be modified from those used by mbuf.
o void setCount(size_t count):
assigns the value count to the object’s message counter.
o void setLineNr(size_t lineNr):
specifies the value lineNr as the message’s line number when the next line is displayed (see also
noLineNr). This value is not changed by the FBB::Mbuf object. To display another line number the
member will have to be called again (i.e., the line number is not displayed automatically again at
every new line).
o void setLineTag(std::string const &tag):
specifies the tag prefixing line numbers. By default the line tag equals `Line’.
o void setMaxCount(size_t maxCount):
defines maxCount as the maximum number of messages that can be inserted into the FBB::Mbuf object.
o void setTag(std::string const &tag):
specifies the tag prefixing messages. By default the tag is empty. If not empty the tag is
enclosed by square brackets. E.g., specifying the tag `Error’ will prefix messages with [Error].
o std::string const &tag() const:
returns the currently used message tag (by default an empty string).
o bool throws():
returns true when the FBB::Mbuf object will throw an FBB::Exception exception at the next
completed message. The generated exception holds the id (see earlier for the member id) of the
FBB::Mbuf object from which the exception was thrown as well as the text FBB::Mbuf.
o void throwing(bool ifTrue):
modifies the behavior of FBB::Mbuf objects at completed messages. After passing true FBB::Mbuf
objects will throw an FBB::Exception exception at the next completed message, otherwise this
exception is not thrown.
EXAMPLE
See the mstream(3bobcat) example.
FILES
bobcat/mbuf - defines the class interface
SEE ALSO
bobcat(7), exception(3bobcat), mstream(3bobcat)
BUGS
None Reported.
BOBCAT PROJECT FILES
o https://fbb-git.gitlab.io/bobcat/: gitlab project page;
o bobcat_6.06.02-x.dsc: detached signature;
o bobcat_6.06.02-x.tar.gz: source archive;
o bobcat_6.06.02-x_i386.changes: change log;
o libbobcat1_6.06.02-x_*.deb: debian package containing the libraries;
o libbobcat1-dev_6.06.02-x_*.deb: debian package containing the libraries, headers and manual pages;
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).