A RAxisGrow that has a label assigned to each bin and a bin width of 1. 
While filling still works through coordinates (i.e. arrays of doubles), RAxisLabels allows to convert a string to a bin number or the bin's coordinate center. The number of labels and the number of bins reported by RAxisGrow might differ: the RAxisGrow will only grow when seeing a Fill(), while the RAxisLabels will add a new label whenever GetBinCenter() is called.
Implementation details: Filling happens often; GetBinCenter() needs to be fast. Thus the unordered_map. The painter needs the reverse: it wants the label for bin 0, bin 1 etc. The axis should only store the bin labels once; referencing them is (due to re-allocation, hashing etc) non-trivial. So instead, build a vector<string_view> for the few times the axis needs to be painted. 
Definition at line 742 of file RAxis.hxx.
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|   | RAxisLabels (const std::vector< std::string > &labels) | 
|   | Construct a RAxisLables from a vector of strings.  
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|   | RAxisLabels (const std::vector< std::string_view > &labels) | 
|   | Construct a RAxisLables from a vector of string_views.  
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|   | RAxisLabels (std::string_view title, const std::vector< std::string > &labels) | 
|   | Construct a RAxisLables from a vector of strings, with title.  
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|   | RAxisLabels (std::string_view title, const std::vector< std::string_view > &labels) | 
|   | Construct a RAxisLables from a vector of string_views, with title.  
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| LabelsCmpFlags  | CompareBinLabels (const RAxisLabels &other) const noexcept | 
|   | Compare the labels of this axis with those of another axis.  
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| int  | FindBinByName (const std::string &label) | 
|   | Get the bin index with label.  
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| double  | GetBinCenterByName (const std::string &label) | 
|   | Get the center of the bin with label.  
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| std::vector< std::string_view >  | GetBinLabels () const | 
|   | Build a vector of labels. The position in the vector defines the label's bin.  
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|   | operator RAxisConfig () const | 
|   | Convert to RAxisConfig.  
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|   | RAxisGrow (int nbins, double low, double high) noexcept | 
|   | Initialize a RAxisGrow.  
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|   | RAxisGrow (std::string_view title, int nbins, double low, double high) noexcept | 
|   | Initialize a RAxisGrow.  
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| bool  | CanGrow () const noexcept final | 
|   | This axis kind can increase its range.  
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| int  | Grow (int toBin) | 
|   | Grow this axis to make the "virtual bin" toBin in-range.  
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|   | operator RAxisConfig () const | 
|   | Convert to RAxisConfig.  
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|   | RAxisEquidistant ()=default | 
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|   | RAxisEquidistant (int nbinsNoOver, double low, double high) noexcept | 
|   | Initialize a RAxisEquidistant.  
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|   | RAxisEquidistant (std::string_view title, int nbinsNoOver, double low, double high) noexcept | 
|   | Initialize a RAxisEquidistant.  
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| int  | FindBin (double x) const noexcept final | 
|   | Find the adjusted bin index (returning kUnderflowBin for underflow and kOverflowBin for overflow) for the given coordinate.  
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| double  | GetBinCenter (int bin) const final | 
|   | Get the bin center for the given bin index.  
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| double  | GetBinFrom (int bin) const final | 
|   | Get the low bin border for the given bin index.  
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| int  | GetBinIndexForLowEdge (double x) const noexcept final | 
|   | If the coordinate x is within 10 ULPs of a bin low edge coordinate, return the bin for which this is a low edge.  
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| double  | GetBinWidth () const noexcept | 
|   | Get the width of the bins.  
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| double  | GetInverseBinWidth () const noexcept | 
|   | Get the inverse of the width of the bins.  
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| int  | GetNBinsNoOver () const noexcept final | 
|   | Get the number of bins, excluding under- and overflow.  
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|   | operator RAxisConfig () const | 
|   | Convert to RAxisConfig.  
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| double  | GetBinTo (int bin) const | 
|   | Get the high bin border ("right edge") for the given bin index.  
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| int  | GetFirstBin () const noexcept | 
|   | Get the bin index for the first bin of the axis.  
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| int  | GetLastBin () const noexcept | 
|   | Get the bin index for the last bin of the axis.  
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| double  | GetMaximum () const | 
|   | Get the high end of the axis range.  
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| double  | GetMinimum () const | 
|   | Get the low end of the axis range.  
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| int  | GetNBins () const noexcept | 
|   | Get the number of bins, including under- and overflow.  
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| int  | GetNOverflowBins () const noexcept | 
|   | Get the number of over- and underflow bins: 0 for growable axes, 2 otherwise.  
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| int  | GetOverflowBin () const noexcept | 
|   | Get the bin index for the overflow bin (or kInvalidBin if CanGrow()).  
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| const std::string &  | GetTitle () const | 
|   | Get the axis's title.  
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| int  | GetUnderflowBin () const noexcept | 
|   | Get the bin index for the underflow bin (or kInvalidBin if CanGrow()).  
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| bool  | HasSameBinningAs (const RAxisBase &other) const | 
|   | Check if two axes use the same binning convention, i.e.  
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| const_iterator  | begin () const noexcept | 
|   | Get a const_iterator pointing to the first regular bin.  
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| const_iterator  | end () const noexcept | 
|   | Get a const_iterator pointing beyond the last regular bin.  
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