spline.hpp

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/*
 * $Id: spline.hpp 293 2012-12-17 20:27:36Z jdl3 $
 * Copyright (C) 2012 John D Lamb
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This program 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
#ifndef CCGSL_SPLINE_HPP
#define CCGSL_SPLINE_HPP
 
#include<new>
#include<gsl/gsl_spline.h>
#include"interp.hpp"
 
namespace gsl {
  class spline {
  public:
    typedef gsl_interp_type type;
    spline(){
      ccgsl_pointer = 0;
      count = 0; // initially nullptr will do
    }
    // Refines random access container
    // Refines assignable
    explicit spline( type const* T, size_t const n ){
      ccgsl_pointer = gsl_spline_alloc( T, n );
      // just plausibly we could allocate spline but not count
      try { count = new size_t; } catch( std::bad_alloc& e ){
    // try to tidy up before rethrowing
    gsl_spline_free( ccgsl_pointer );
    throw e;
      }
      *count = 1; // initially there is just one reference to ccgsl_pointer
    }
    explicit spline( gsl_spline* v ){
      ccgsl_pointer = v;
      // just plausibly we could fail to allocate count: no further action needed.
      count = new size_t;
      *count = 1; // initially there is just one reference to ccgsl_pointer
    }
    // copy constructor
    spline( spline const& v ){ ccgsl_pointer = v.ccgsl_pointer;
      count = v.count; if( count != 0 ) ++*count; }
    // assignment operator
    spline& operator=( spline const& v ){
      // first, possibly delete anything pointed to by this
      if( count == 0 or --*count == 0 ){
    if( ccgsl_pointer != 0 ) gsl_spline_free( ccgsl_pointer );
    delete count;
      } // Then copy
      ccgsl_pointer = v.ccgsl_pointer; count = v.count; if( count != 0 ) ++*count; return *this;
    }
    // destructor
    ~spline(){
      if( count == 0 or --*count == 0 ){
    // could have allocated null pointer
    if( ccgsl_pointer != 0 ) gsl_spline_free( ccgsl_pointer );
    delete count;
      }
    }
#ifdef __GXX_EXPERIMENTAL_CXX0X__
    spline( spline&& v ) : ccgsl_pointer( v.ccgsl_pointer ), count( nullptr ){
      std::swap( count, v.count );
      v.ccgsl_pointer = nullptr;
    }
    spline& operator=( spline&& v ){
      spline( std::move( v ) ).swap( *this );
      return *this;
    }
#endif
    // Refines equality comparable
    // == operator
    bool operator==( spline const& v ) const { return ccgsl_pointer == v.ccgsl_pointer; }
    // != operator
    bool operator!=( spline const& v ) const { return not operator==( v ); }
    // Refines forward container
    // Refines less than comparable
    // operator<
    bool operator<( spline const& v ) const { return ccgsl_pointer < v.ccgsl_pointer; }
    // operator>
    bool operator>( spline const& v ) const { return ccgsl_pointer > v.ccgsl_pointer; }
    // operator<=
    bool operator<=( spline const& v ) const { return ccgsl_pointer <= v.ccgsl_pointer; }
    // operator>=
    bool operator>=( spline const& v ) const { return ccgsl_pointer >= v.ccgsl_pointer; }
    bool empty() const { return ccgsl_pointer == 0; }
    // swap() --- should work even if sizes don't match
    void swap( spline& v ){
      std::swap( ccgsl_pointer, v.ccgsl_pointer );
      std::swap( count, v.count );
    }
  private:
    gsl_spline* ccgsl_pointer;
    size_t* count;
  public:
    // shared reference functions
    gsl_spline* get() const { return ccgsl_pointer; }
    bool unique() const { return count != 0 and *count == 1; }
    size_t use_count() const { return count == 0 ? 0 : *count; }
#ifdef __GXX_EXPERIMENTAL_CXX0X__
    explicit
#endif
    operator bool() const { return ccgsl_pointer != 0; }
 
    int init( double const xa[], double const ya[], size_t size ){
      return gsl_spline_init( get(), xa, ya, size ); }
 
    template<typename XA,typename YA>
    int init( XA const& xa, YA const& ya ){
      return gsl_spline_init( get(), xa.data(), ya.data(), xa.size() ); }
 
    char const* name() const { return gsl_spline_name( get() ); }
 
    unsigned int min_size() const { return gsl_spline_min_size( get() ); }
 
    int eval_e( double x, interp::accel& a, double* y ) const {
      return gsl_spline_eval_e( get(), x, a.get(), y ); }
    int eval_e( double x, interp::accel& a, double& y ) const {
      return gsl_spline_eval_e( get(), x, a.get(), &y ); }
 
    double eval( double x, interp::accel& a ) const {
      return gsl_spline_eval( get(), x, a.get() ); }
 
    int eval_deriv_e( double x, interp::accel& a, double* y ) const {
      return gsl_spline_eval_deriv_e( get(), x, a.get(), y ); }
    int eval_deriv_e( double x, interp::accel& a, double& y ) const {
      return gsl_spline_eval_deriv_e( get(), x, a.get(), &y ); }
 
    double eval_deriv( double x, interp::accel& a ) const {
      return gsl_spline_eval_deriv( get(), x, a.get() ); }
 
    int eval_deriv2_e( double x, interp::accel& a, double* y ) const {
      return gsl_spline_eval_deriv2_e( get(), x, a.get(), y ); }
    int eval_deriv2_e( double x, interp::accel& a, double& y ) const {
      return gsl_spline_eval_deriv2_e( get(), x, a.get(), &y ); }
 
    double eval_deriv2( double x, interp::accel& a ) const {
      return gsl_spline_eval_deriv2( get(), x, a.get() ); }
 
    int eval_integ_e( double a, double b, interp::accel& acc, double* y ) const {
      return gsl_spline_eval_integ_e( get(), a, b, acc.get(), y ); }
    int eval_integ_e( double a, double b, interp::accel& acc, double& y ) const {
      return gsl_spline_eval_integ_e( get(), a, b, acc.get(), &y ); }
 
    double eval_integ( double a, double b, interp::accel& acc ) const {
      return gsl_spline_eval_integ( get(), a, b, acc.get() ); }
 
  };
}
#endif