ion::base::VariantTypeResolver< VariantType, TypeToResolve > Struct Template Reference

The VariantTypeResolver struct allows users of the Variant class to determine which type defined by a particular Variant can be used to store a value of a particular type. More...

#include "varianttyperesolver.h"

Public Types
typedef internal::ResolverHelper < VariantType, TypeToResolve, TypeToResolve >::Type	Type

Detailed Description

template<typename VariantType, typename TypeToResolve>
struct ion::base::VariantTypeResolver< VariantType, TypeToResolve >

The VariantTypeResolver struct allows users of the Variant class to determine which type defined by a particular Variant can be used to store a value of a particular type.

For a defined Variant type T, VariantTypeResolver<VariantType, T>::Type will be T if T is one of the defined types or is a type derived from one of the defined types. Note that other type conversions are not allowed.

For example, suppose you have: typedef Variant<int, double, BaseClass> MyVariant;

Then: VariantTypeResolver<MyVariant, int>::Type will be int because int is one of the defined types. VariantTypeResolver<MyVariant, double>::Type will be double for the same reason. VariantTypeResolver<MyVariant, float>::Type will be void, because float is not one of the defined types (and no conversions are allowed). VariantTypeResolver<MyVariant, BaseClass>::Type will be BaseClass. VariantTypeResolver<MyVariant, DerivedClass>::Type will be BaseClass if DerivedClass is derived from BaseClass.

Definition at line 139 of file varianttyperesolver.h.

Member Typedef Documentation

template<typename VariantType, typename TypeToResolve>

typedef internal::ResolverHelper< VariantType, TypeToResolve, TypeToResolve>::Type ion::base::VariantTypeResolver< VariantType, TypeToResolve >::Type

Definition at line 141 of file varianttyperesolver.h.

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The documentation for this struct was generated from the following file:

• base/varianttyperesolver.h