#include <bslmf_isempty.h>
Additional Inherited Members | |
 Public Types inherited from bsl::integral_constant< t_TYPE, t_VAL > | |
| typedef t_TYPE | value_type |
| typedef integral_constant | type |
| Public Member Functions inherited from bsl::integral_constant< t_TYPE, t_VAL > | |
| integral_constant ()=default | |
| integral_constant (const integral_constant &)=default | |
| integral_constant | operator= (const integral_constant &)=default |
| ~integral_constant ()=default | |
| BSLS_KEYWORD_CONSTEXPR | operator value_type () const BSLS_KEYWORD_NOEXCEPT |
Return t_VAL. | |
| Static Public Attributes inherited from bsl::integral_constant< t_TYPE, t_VAL > | |
| static const t_TYPE | value = t_VAL |
Detailed Description
struct bsl::is_empty< t_TYPE >
This struct is a meta-function to determine whether the (template parameter) t_TYPE is an empty class type. This struct derives from bsl::true_type if the t_TYPE is empty, and from bsl::false_type otherwise. This meta-function has the same syntax as the is_empty meta-function defined in the C++11 standard [meta.unary.prop]; on C++03 platforms, however, this meta-function defaults to true_type if t_TYPE is a class or struct with no non-static data members other than bit-fields of length 0, no virtual member functions, no virtual base classes, and no base class B for which is_empty<B>::value is false; otherwise is_empty defaults to false_type. Note that this meta-function will fail to compile for a union that is the same size as an empty class in C++03.
This struct is a meta-function to determine whether the (template parameter) t_TYPE is an empty class type. is_empty inherits from true_type if t_TYPE is a class or struct with no non-static data members other than bit-fields of length 0, no virtual member functions, no virtual base classes, and no base class B for which is_empty<B>::value is false; otherwise is_empty inherits from false_type. Note that this meta-function will fail to compile for a union that is the same size as an empty class in C++03.
The documentation for this struct was generated from the following file:
