1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Base/Math/IntegratorGK.h
//! @brief Defines classes RealIntegrator, ComplexIntegrator.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#ifdef SWIG
#error no need to expose this header to Swig
#endif // SWIG
#ifndef BORNAGAIN_BASE_MATH_INTEGRATORGK_H
#define BORNAGAIN_BASE_MATH_INTEGRATORGK_H
#include <functional>
#include <gsl/gsl_integration.h>
#include <heinz/Complex.h>
//! To integrate a real function of a real variable.
class RealIntegrator {
public:
RealIntegrator();
~RealIntegrator();
double integrate(const std::function<double(double)>& f, double lmin, double lmax);
private:
static double m_Cfunction(double x, void* p)
{
return (*(const std::function<double(double)>*)(p))(x);
};
gsl_function m_gsl_f;
gsl_integration_workspace* m_workspace;
};
//! To integrate a complex function of a real variable.
class ComplexIntegrator {
public:
complex_t integrate(const std::function<complex_t(double)>& f, double lmin, double lmax);
private:
RealIntegrator realPart;
RealIntegrator imagPart;
};
#endif // BORNAGAIN_BASE_MATH_INTEGRATORGK_H
|
