Count how many times t_TYPE occurs among the listed alternatives.

Synopsis

Declared in <bslstl_variant.h>

template<
    class t_TYPE,
    class t_HEAD = BSLSTL_VARIANT_NOT_A_TYPE,
    class... t_TAIL>
struct Variant_CountType
    : bsl::integral_constant<size_t, bsl::is_same<t_TYPE, t_HEAD>::value + Variant_CountType<t_TYPE, t_TAIL...>::value>

Description

This component‐private metafunction calculates the number of times (template parameter) t_TYPE occurs in (template parameters) t_HEAD, t_TAIL....

An alternative must have the same cv‐qualification as t_TYPE in order to be counted.

Base Classes

Name

Description

bsl::integral_constant<size_t, bsl::is_same<t_TYPE, t_HEAD>::value + Variant_CountType<t_TYPE, t_TAIL...>::value>

Metafunction representing a compile‐time constant of the specified (template parameter) t_TYPE with the specified (template parameter) t_VALUE.

Type Aliases

Name

Description

type

Alias for this integral_constant specialization.

value_type

Alias for the (template parameter) t_TYPE.

Member Functions

Name

Description

operator()

Return a copy of the template argument t_VALUE.

operator t_TYPE

Return a copy of the template argument t_VALUE.

Static Data Members

Name

Description

value

The compile‐time constant value of this metafunction.

Specializations

Name

Description

Variant_CountType<t_TYPE, BSLSTL_VARIANT_NOT_A_TYPE>

Specialization for purposes of the sim_cpp11_features.pl script.

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