VariantUtils.hh File Reference

Host-only utilities for use with std::variant. More...

#include <type_traits>
#include <utility>
#include "corecel/Assert.hh"
#include "detail/VariantUtilsImpl.hh"

This graph shows which files directly or indirectly include this file:

Classes
struct	celeritas::Overload< Ts >
	Helper class for dispatching type-specific lambdas. More...
class	celeritas::ContainerVisitor< T, U >
	Visit a container's element by calling "visit" on the corresponding index. More...

Typedefs
template<class E , template< E > class ETraits>
using	celeritas::EnumVariant = typename detail::EnumVariantImpl< E, ETraits >::type
	Define a variant that contains all the classes mapped by an enum+traits.

Functions
template<class... Ts>
	celeritas::Overload (Ts &&...) -> Overload< Ts... >
template<class... Ts>
	celeritas::Overload (Ts &...) -> Overload< Ts... >
template<class T , class F >
detail::ReturnAsImpl< T, F >	celeritas::return_as (F &&func)
	Create a wrapper functor for unifying the return type.
template<class T >
	celeritas::ContainerVisitor (T &&) -> ContainerVisitor< T >

Detailed Description

Host-only utilities for use with std::variant.

Typedef Documentation

EnumVariant

template<class E , template< E > class ETraits>

using celeritas::EnumVariant = typedef typename detail::EnumVariantImpl<E, ETraits>::type

Define a variant that contains all the classes mapped by an enum+traits.

For example:

using VariantSurface = EnumVariant<SurfaceType, SurfaceTypeTraits>;

is equivalent to:

using VariantSurface = std::variant<PlaneX, PlaneY, ..., GeneralQuadric>;

See also

EnumClassUtils.hh

Function Documentation

return_as()

template<class T , class F >

detail::ReturnAsImpl< T, F > celeritas::return_as

(

F &&

func

)

Create a wrapper functor for unifying the return type.

This provides a unified return type T (usually a variant) that can be implicitly constructed from all return types of a functor F that operates on a generic type U . The class is necessary because std::visit requires all return types to be the same.

Example:

std::visit(return_as<VariantTransform>(Translate{{1,2,3}}), value);