/usr/include/FL/Fl_Float_Input.H is in libfltk1.3-dev 1.3.0-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// "$Id: Fl_Float_Input.H 8726 2011-05-23 18:32:47Z AlbrechtS $"
//
// Floating point input header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2011 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
/* \file
Fl_Float_Input widget . */
#ifndef Fl_Float_Input_H
#define Fl_Float_Input_H
#include "Fl_Input.H"
/**
The Fl_Float_Input class is a subclass of Fl_Input
that only allows the user to type floating point numbers (sign,
digits, decimal point, more digits, 'E' or 'e', sign, digits).
*/
class FL_EXPORT Fl_Float_Input : public Fl_Input {
public:
/**
Creates a new Fl_Float_Input widget using the given position,
size, and label string. The default boxtype is FL_DOWN_BOX.
Inherited destructor destroys the widget and any value associated with it.
*/
#if defined(FL_DLL) // implementation in src/Fl_Input.cxx
Fl_Float_Input(int X,int Y,int W,int H,const char *l = 0);
#else
Fl_Float_Input(int X,int Y,int W,int H,const char *l = 0)
: Fl_Input(X,Y,W,H,l) {type(FL_FLOAT_INPUT);}
#endif
};
#endif
//
// End of "$Id: Fl_Float_Input.H 8726 2011-05-23 18:32:47Z AlbrechtS $".
//
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