Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 12]

►Nmumufit	The multi-library, multi-algorithm fit wrapper library
CMinimizer	A main class to run fitting
CMinimizerResult	Result of minimization round
CParameter	A fittable parameter with value, error, step, and limits
CParameters	A collection of fit parameters
CAngularSpecScan	Scan type with inclination angles as coordinate values and a unique wavelength
CAttLimits	Attributes and limits of a fit parameter, and coupling between these properties
CAxes	Wrapper for detector axes units, required for a better representation of detector axes units in python
CAxisInfo	Information about an axis in specific units
CBasicLattice2D	A two-dimensional Bravais lattice with no special symmetry
CBasicVector3D	Three-dimensional vector template, for use with integer, double, or complex components
CBeam	An incident neutron or x-ray beam
CBin1D
CBin1DCVector	An one-dimensional range of cvector_t's
CBin1DKVector	An one-dimensional range of kvector_t's
CChiSquaredModule	Calculation of chi2 between two data sets
CConstantBackground	Class representing a constant background signal
CConstKBinAxis	Axis with fixed bin size in sin(angle) space
CCrystal	A crystal structure, defined by a Bravais lattice, a basis, and a position variance
CCustomBinAxis	Axis with fixed bin size in sin(angle) space used for numerical comparison with IsGisaxs
CDepthProbeSimulation
CDetectorMask	Collection of detector masks
CDirection	A direction in three-dimensional space
CDistributionCosine	Cosine distribution
CDistributionGate	Uniform distribution function with half width hwhm
CDistributionGaussian	Gaussian distribution with standard deviation std_dev
CDistributionLogNormal	Log-normal distribution
CDistributionLorentz	Lorentz distribution with half width hwhm
CDistributionTrapezoid	Trapezoidal distribution
CEllipse	An ellipse, for use in detector masks
CFitObjective	Holds vector of `SimDataPair`s (experimental data and simulation results) for use in fitting
CFitOptions	General fitting options
CFixedBinAxis	Axis with fixed bin size
CFootprintGauss	Gaussian beam footprint
CFootprintSquare	Rectangular beam footprint
CFormFactorAnisoPyramid	A frustum (truncated pyramid) with rectangular base
CFormFactorBox	A rectangular prism (parallelepiped)
CFormFactorCantellatedCube	A cube, with truncation of all edges and corners, as in Croset (2017) Fig 7
CFormFactorCone	A conical frustum (cone truncated parallel to the base) with circular base
CFormFactorCone6	A frustum (truncated pyramid) with regular hexagonal base
CFormFactorCosineRippleBox	The form factor for a cosine ripple, with box profile in elongation direction
CFormFactorCosineRippleGauss	The form factor for a cosine ripple, with Gaussian profile in elongation direction
CFormFactorCosineRippleLorentz	The form factor for a cosine ripple, with Lorentz form factor in elongation direction
CFormFactorCrystal	The form factor of a MesoCrystal
CFormFactorCuboctahedron	A truncated bifrustum with quadratic base
CFormFactorCylinder	A circular cylinder
CFormFactorDodecahedron	A regular dodecahedron
CFormFactorDot	A dot, with scattering power as a sphere of radius rscat, but with F(q)=const
CFormFactorEllipsoidalCylinder	A cylinder with elliptical base
CFormFactorFullSphere	A full sphere
CFormFactorFullSpheroid	A full spheroid (an ellipsoid with two equal axes, hence with circular cross section)
CFormFactorGaussSphere	The form factor of a Gaussian sphere
CFormFactorHemiEllipsoid	An hemi ellipsoid, obtained by truncating a full ellipsoid in the middle plane spanned by two principal axes
CFormFactorHollowSphere	Integrated full sphere form factor over a uniform distribution of radii
CFormFactorIcosahedron	A regular icosahedron
CFormFactorLongBoxGauss	The form factor for a long rectangular box
CFormFactorLongBoxLorentz	The form factor for a long rectangular box
CFormFactorPrism3	A prism based on an equilateral triangle
CFormFactorPrism6	A prism based on a regular hexagonal
CFormFactorPyramid	A frustum with a quadratic base
CFormFactorSawtoothRippleBox	The form factor for a cosine ripple, with box profile in elongation direction
CFormFactorSawtoothRippleGauss	The form factor for a cosine ripple, with Gaussian profile in elongation direction
CFormFactorSawtoothRippleLorentz	The form factor for a cosine ripple, with Lorentz form factor in elongation direction
CFormFactorSphereGaussianRadius	A sphere with gaussian radius distribution
CFormFactorSphereLogNormalRadius	A sphere with log normal radius distribution
CFormFactorTetrahedron	A frustum with equilateral trigonal base
CFormFactorTruncatedCube	A cube, with tetrahedral truncation of all corners
CFormFactorTruncatedSphere	A truncated Sphere
CFormFactorTruncatedSpheroid	A truncated spheroid
CFormFactorWeighted	Coherent sum of different scalar IFormFactors with different weights
CFTDecayFunction1DCauchy	One-dimensional Cauchy decay function in reciprocal space; corresponds to exp(-\|x\|/decay_length) in real space
CFTDecayFunction1DGauss	One-dimensional Gauss decay function in reciprocal space; corresponds to exp[-x^2/(2*decay_length^2)] in real space
CFTDecayFunction1DTriangle	One-dimensional triangle decay function in reciprocal space; corresponds to 1-\|x\|/decay_length if \|x\|<decay_length (and 0 otherwise) in real space
CFTDecayFunction1DVoigt	One-dimensional pseudo-Voigt decay function in reciprocal space; corresponds to etaGauss + (1-eta)Cauchy
CFTDecayFunction2DCauchy	Two-dimensional Cauchy decay function in reciprocal space; corresponds to exp(-r) in real space, with $r=\sqrt{(\frac{x}{\omega_x})^2 + (\frac{y}{\omega_y})^2}$
CFTDecayFunction2DGauss	Two-dimensional Gauss decay function in reciprocal space; corresponds to exp(-r^2/2) in real space, with $r=\sqrt{(\frac{x}{\omega_x})^2 + (\frac{y}{\omega_y})^2}$
CFTDecayFunction2DVoigt	Two-dimensional pseudo-Voigt decay function in reciprocal space; corresponds to etaGauss + (1-eta)Cauchy
CFTDistribution1DCauchy	Exponential IFTDistribution1D exp(-\|omega*x\|); its Fourier transform evaluate(q) is a Cauchy-Lorentzian starting at evaluate(0)=1
CFTDistribution1DCosine	IFTDistribution1D consisting of one cosine wave [1+cos(pi*x/omega) if \|x\|<omega, and 0 otherwise]; its Fourier transform evaluate(q) starts at evaluate(0)=1
CFTDistribution1DGate	Square gate IFTDistribution1D; its Fourier transform evaluate(q) is a sinc function starting at evaluate(0)=1
CFTDistribution1DGauss	Gaussian IFTDistribution1D; its Fourier transform evaluate(q) is a Gaussian starting at evaluate(0)=1
CFTDistribution1DTriangle	Triangle IFTDistribution1D [1-\|x\|/omega if \|x\|<omega, and 0 otherwise]; its Fourier transform evaluate(q) is a squared sinc function starting at evaluate(0)=1
CFTDistribution1DVoigt	IFTDistribution1D that provides a Fourier transform evaluate(q) in form of a pseudo-Voigt decay function etaGauss + (1-eta)Cauchy, with both components starting at 1 for q=0
CFTDistribution2DCauchy	Two-dimensional Cauchy distribution in Fourier space; corresponds to a normalized exp(-r) in real space, with $r=\sqrt{(\frac{x}{\omega_x})^2 + (\frac{y}{\omega_y})^2}$
CFTDistribution2DCone	Two-dimensional cone distribution in Fourier space; corresponds to 1-r if r<1 (and 0 otherwise) in real space with $r=\sqrt{(\frac{x}{\omega_x})^2 + (\frac{y}{\omega_y})^2}$
CFTDistribution2DGate	Two-dimensional gate distribution in Fourier space; corresponds to normalized constant if r<1 (and 0 otherwise) in real space, with $r=\sqrt{(\frac{x}{\omega_x})^2 + (\frac{y}{\omega_y})^2}$
CFTDistribution2DGauss	Two-dimensional Gauss distribution in Fourier space; corresponds to normalized exp(-r^2/2) in real space with $r=\sqrt{(\frac{x}{\omega_x})^2 + (\frac{y}{\omega_y})^2}$
CFTDistribution2DVoigt	Two-dimensional Voigt distribution in Fourier space; corresponds to etaGauss + (1-eta)Cauchy
CGISASSimulation	Main class to run a Grazing-Incidence Small-Angle Scattering simulation
CHexagonalLattice2D	A two-dimensional Bravais lattice with hexagonal symmetry
CHistogram1D	One dimensional histogram
CHistogram2D	Two dimensional histogram
CHorizontalLine	An infinite horizontal line
CIdentityRotation	The identity rotation, which leaves everything in place
CIntensityDataIOFactory	Provides users with possibility to read and write IntensityData from/to files in different format
CInterferenceFunction1DLattice	Interference function of a 1D lattice
CInterferenceFunction2DLattice	Interference function of a 2D lattice
CInterferenceFunction2DParaCrystal	Interference function of a 2D paracrystal
CInterferenceFunction2DSuperLattice	Interference function of a 2D superlattice with a configurable interference function for each lattice site
CInterferenceFunction3DLattice	Interference function of a 3D lattice
CInterferenceFunctionFinite2DLattice	Interference function of a finite 2D lattice
CInterferenceFunctionFinite3DLattice	Interference function of a finite 3D lattice
CInterferenceFunctionHardDisk	Percus-Yevick hard disk interference function
CInterferenceFunctionNone	Default interference function (i.e
CInterferenceFunctionRadialParaCrystal	Interference function of radial paracrystal
CInterferenceFunctionTwin	Interference function for two particles at a mean distance and given standard deviation from each other in a given direction
CIsGISAXSDetector	A spherical detector used for validation with IsGISAXS results
CIterationInfo	Stores fit iteration info to track fit flow from various observers
►CLattice2D	A two-dimensional Bravais lattice
CReciprocalBases
CLattice3D	A Bravais lattice, characterized by three basis vectors, and optionally an ISelectionRule
CLayer	A layer in a MultiLayer sample
CLayerRoughness	A roughness of interface between two layers
CLine	A line segment, for use in detector masks
CMaterial	A wrapper for underlying material implementation
CMesoCrystal	A particle with an internal structure of smaller particles
CMinimizerCatalog	Hard-coded information about all minimizers available
CMinimizerFactory	Factory to create minimizers
CMultiLayer	Our sample model: a stack of layers one below the other
COffSpecularSimulation	Main class to run an off-specular simulation
COutputData	Templated class to store data of type double or CumulativeValue in multi-dimensional space
CParameterDistribution	A parametric distribution function, for use with any model parameter
CParameterPool	Container with parameters for IParametricComponent object
CParameterSample	A parameter value with a weight, as obtained when sampling from a distribution
CParticle	A particle with a form factor and refractive index
CParticleComposition	A composition of particles at fixed positions
CParticleCoreShell	A particle with a core/shell geometry
CParticleDistribution	A particle type that is a parametric distribution of IParticle's
CParticleLayout	Decorator class that adds particles to ISampleNode objects
CPoissonNoiseBackground	Class representing Poisson noise on top of the scattered intensity
CPolygon	A polygon, for use in detector masks
CPyBuilderCallback	Builds simulation object using a Python callable
CPyCallback	Base class to wrap Python callable and pass it to C++
CPyObserverCallback	Observer for FitObjective based on Python callable
CQSpecScan	Scan type with z-components of scattering vector as coordinate values
CRangedDistributionCosine	Cosine distribution
CRangedDistributionGate	Uniform distribution function
CRangedDistributionGaussian	Gaussian distribution with standard deviation std_dev
CRangedDistributionLogNormal	Log-normal distribution
CRangedDistributionLorentz	Lorentz distribution with median and hwhm
CRealLimits	Limits for a real fit parameter
CRealParameter	Wraps a parameter of type double
CRectangle	A rectangle, for use in detector masks
CRectangularDetector	A flat rectangular detector with axes and resolution function
CResolutionFunction2DGaussian	Simple gaussian two-dimensional resolution function
CRotationEuler	A sequence of rotations about the z-x'-z'' axes
CRotationX	A rotation about the x axis
CRotationY	A rotation about the y axis
CRotationZ	A rotation about the z axis
CRoughnessModelWrap
CSampleBuilderFactory	Factory to create standard pre-defined samples
CScanResolution	Container for reflectivity resolution data
CSimulationOptions	Collect the different options for simulation
CSimulationResult	Wrapper around OutputData<double> that also provides unit conversions
CSpecularSimulation	Main class to run a specular simulation
CSphericalDetector	A detector with coordinate axes along angles phi and alpha
CSquareLattice2D	A two-dimensional Bravais lattice with square unit cell
CThreadInfo	Information to run simulation with dedicated number of threads
CTransform3D	Vector transformations in three dimensions
CVariableBinAxis	Axis with variable bin size
CVarianceConstantFunction	Returns 1.0 as variance value
CVarianceSimFunction	Returns max(sim, epsilon)
CVerticalLine	An infinite vertical line
CWavevectorInfo	Holds all wavevector information relevant for calculating form factors