colvarbias_histogram.h
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	// -- c++ --

	// This file is part of the Collective Variables module (Colvars).
	// The original version of Colvars and its updates are located at:
	// https://github.com/colvars/colvars
	// Please update all Colvars source files before making any changes.
	// If you wish to distribute your changes, please submit them to the
	// Colvars repository at GitHub.

	#ifndef COLVARBIAS_HISTOGRAM_H
	#define COLVARBIAS_HISTOGRAM_H

	#include <vector>
	#include <list>
	#include <sstream>
	#include <iomanip>

	#include "colvarbias.h"
	#include "colvargrid.h"

	/// Histogram "bias" (does as the name says)
	class colvarbias_histogram : public colvarbias {

	public:

	colvarbias_histogram(char const *key);
	~colvarbias_histogram();
	virtual int init(std::string const &conf);
	virtual int update();
	virtual int write_output_files();

	protected:

	/// n-dim histogram
	colvar_grid_scalar *grid;
	std::vector<int> bin;
	std::string out_name, out_name_dx;
	size_t output_freq;

	/// If one or more of the variables are \link type_vector \endlink, treat them as arrays of this length
	size_t colvar_array_size;
	/// If colvar_array_size is larger than 1, weigh each one by this number before accumulating the histogram
	std::vector<cvm::real> weights;

	virtual std::istream & read_state_data(std::istream &is);
	virtual std::ostream & write_state_data(std::ostream &os);
	};

	#endif