FBB::X2a(3) Objects performing x-to-Ascii conversions


#include <bobcat/x2a>
Linking option: -lbobcat


FBB:X2a objects convert values of any (insertable) type to text. The returned text is automatically made available as a standard C++ string.


All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.




  • X2a(T const &value):
    In this constructor T may be any type that can be inserted into an o[string]stream.
  • X2a(double value, size_t behind):
    Double value is truncated to behind digits behind the decimal dot. If a value doesn't occupy behind digits behind the decimal point, then missing digits are added as 0. For example, a value of 7.1, will be displayed as 7.10 if two digits behind the decimal dot are requested. A value of 7 will be displayed as 7.00.
  • X2a(double value, size_t width, size_t behind, std::ios::fmtflags flags = std::ios::right):
    The value is displayed over width character positions, extending the amount if the value so requires. The converted value is placed right-aligned into the field of width characters. The copy constructor is available as well.


  • bool lastFail():
    This member returns true if the last conversion failed (i.e., the object's fail() member returned true and returns false otherwise). This member allows checks on the success of the extraction/conversion using anonymous A2x objects. The member also returns true when no conversions have as yet been performed.
    Note that this member is a thread-unsafe static member: in a multithreaded program locks may be required to ensure that the proper conversion result is inspected.


All members of std::ostringstream are available, as FBB::X2a inherits from this class. In particular ostringstream::str() can be used to obtain the contents of an X2a object's text buffer.


  • operator std::ostream &operator<<(std::ostream &ostr, X2a const &x2a):
    This conversion operator inserts the textual representation of the x2a parameter value into the provided ostream.
  • operator std::string const() const:
    this conversion operator returns the information stored inside the FBB::X2a object. The standard overloaded assignment operator is available as well.


    string is(X2a(5));      // initializes `is' with "5"
    string ds(X2a(5.25));   // initializes `ds' with "5.25"
    cout << X2a(7.0 / 3, 4) << endl;
                            // display a value using 4 digits behind the
                            // decimal dot.
    cout << X2a(7.0 / 3, 8, 4) << endl;
                            // display a value over 8 positions, right
                            // adjusted, 4 digits behind the decimal dot.
    cout << X2a(7.0 / 3, 8, 4, std::ios::left) << endl;
                            // display a value over 8 positions, left
                            // adjusted, 4 digits behind the decimal dot.


bobcat/x2a - defines the class interface


None Reported.


  • bobcat_4.02.00-x.dsc: detached signature;
  • bobcat_4.02.00-x.tar.gz: source archive;
  • bobcat_4.02.00-x_i386.changes: change log;
  • libbobcat1_4.02.00-x_*.deb: debian package holding the libraries;
  • libbobcat1-dev_4.02.00-x_*.deb: debian package holding the libraries, headers and manual pages;
  • http://sourceforge.net/projects/bobcat: public archive location;


Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.


This is free software, distributed under the terms of the GNU General Public License (GPL).


Frank B. Brokken ([email protected]).