libigl/include/igl/randperm.h

// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2013 Alec Jacobson <[email protected]>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_RANDPERM_H
#define IGL_RANDPERM_H
#include "igl_inline.h"
#include "generate_default_urbg.h"
#include <Eigen/Core>
#include <random>
namespace igl
{
  /// Like matlab's randperm(n) but minus 1
  ///
  /// When urbg is not specified, randperm will use default random bit generator
  /// std::minstd_rand initialized with random seed generated by std::rand()
  ///
  /// @param[in] n  number of elements
  /// @param[out] I  n list of rand permutation of 0:n-1
  /// @param[in,out] urbg An instance of UnformRandomBitGenerator.
  template <typename DerivedI, typename URBG = DEFAULT_URBG>
  IGL_INLINE void randperm(
    const int n,
    Eigen::PlainObjectBase<DerivedI> & I,
    URBG && urbg = igl::generate_default_urbg());
}
#ifndef IGL_STATIC_LIBRARY
#  include "randperm.cpp"
#endif
#endif