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RooConstVar.cxx
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1/*****************************************************************************
2 * Project: RooFit *
3 * Package: RooFitCore *
4 * @(#)root/roofitcore:$Id$
5 * Authors: *
6 * WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu *
7 * DK, David Kirkby, UC Irvine, dkirkby@uci.edu *
8 * *
9 * Copyright (c) 2000-2005, Regents of the University of California *
10 * and Stanford University. All rights reserved. *
11 * *
12 * Redistribution and use in source and binary forms, *
13 * with or without modification, are permitted according to the terms *
14 * listed in LICENSE (http://roofit.sourceforge.net/license.txt) *
15 *****************************************************************************/
16
17/**
18\file RooConstVar.cxx
19\class RooConstVar
20\ingroup Roofitcore
21
22Represents a constant real-valued object.
23**/
24
25#include "RooConstVar.h"
26#include "RooNumber.h"
27
29
30
31////////////////////////////////////////////////////////////////////////////////
32/// Constructor with value
33RooConstVar::RooConstVar(const char *name, const char *title, double value) :
34 RooAbsReal(name,title)
35{
36 _fast = true;
37 _value = value;
38 setAttribute("Constant",true) ;
39}
40
41
42
43////////////////////////////////////////////////////////////////////////////////
44/// Copy constructor
45RooConstVar::RooConstVar(const RooConstVar& other, const char* name) :
46 RooAbsReal(other, name)
47{
48 _fast = true;
49}
50
51////////////////////////////////////////////////////////////////////////////////
52/// Write object contents to stream
53
54void RooConstVar::writeToStream(std::ostream& os, bool /*compact*/) const
55{
56 os << _value ;
57}
58
59////////////////////////////////////////////////////////////////////////////////
60
62{
63 // Just return a stringy-field version of the const value.
64 // Formats to the maximum precision.
65 constexpr auto max_precision{std::numeric_limits<double>::digits10 + 1};
66 std::stringstream ss;
67 ss.precision(max_precision);
68 // Just use toString to make sure we do not output 'inf'.
69 // This is really ugly for large numbers...
70 ss << std::fixed << RooNumber::toString(_value);
71 ctx.addResult(this, ss.str());
72}
#define ClassImp(name)
Definition Rtypes.h:377
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void value
char name[80]
Definition TGX11.cxx:110
bool _fast
Definition RooAbsArg.h:715
void setAttribute(const Text_t *name, bool value=true)
Set (default) or clear a named boolean attribute of this object.
Abstract base class for objects that represent a real value and implements functionality common to al...
Definition RooAbsReal.h:59
double _value
Cache for current value of object.
Definition RooAbsReal.h:543
Represents a constant real-valued object.
Definition RooConstVar.h:23
void writeToStream(std::ostream &os, bool compact) const override
Write object contents to stream.
void translate(RooFit::Detail::CodeSquashContext &ctx) const override
This function defines a translation for each RooAbsReal based object that can be used to express the ...
A class to maintain the context for squashing of RooFit models into code.
void addResult(RooAbsArg const *key, std::string const &value)
A function to save an expression that includes/depends on the result of the input node.
static std::string toString(double x)
Returns an std::to_string compatible number (i.e.
Definition RooNumber.cxx:31