std::experimental::reflect::Object

 

C++

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Freestanding and hosted

Language

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Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

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Strings library

Containers library

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Ranges library (C++20)

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Technical specifications

Symbols index

External libraries

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

Concepts (concepts TS)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

 

Extensions for reflection

Concepts
Object ObjectSequence TemplateParameterScope      Named Alias RecordMember Enumerator Variable ScopeMember	Typed Namespace GlobalScope      Class Enum Record Scope Type Constant	Base FunctionParameter Callable Expression ParenthesizedExpression FunctionCallExpression FunctionalTypeConversion      Function	MemberFunction SpecialMemberFunction Constructor Destructor Operator ConversionOperator Lambda LambdaCapture
Meta-object operations
Object reflects_same get_source_line get_source_column get_source_file_name ObjectSequence get_size get_element unpack_sequence Named is_unnamed get_name get_display_name Alias get_alias Type get_type get_reflected_type is_enum is_union uses_class_keyuses_struct_key ScopeMember get_scope	RecordMember and Base is_public is_protected is_private Record get_public_data_membersget_accessible_data_membersget_data_members get_public_member_functionsget_accessible_member_functionsget_member_functions      get_constructors get_operators get_destructor get_public_member_typesget_accessible_member_typesget_member_types get_public_base_classesget_accessible_base_classesget_base_classes Enum is_scoped_enum get_enumerators get_underlying_type	Variable get_constant is_thread_local FunctionParameter has_default_argument Callable get_parameters is_vararg is_noexcept is_deleted Variable and Callable is_constexpr Namespace and Callable is_inline ParenthesizedExpression get_subexpression FunctionCallExpression get_callable FunctionalConversion get_constructor Variable and Function get_pointer	MemberFunction is_constis_volatilehas_lvalueref_qualifierhas_rvalueref_qualifier is_override is_implicitly_declared is_defaulted is_explicit is_virtual is_pure_virtual Record and MemberFunction is_final Variable and MemberFunction is_static Lambda get_captures uses_default_copy_captureuses_default_reference_capture is_call_operator_const LambdaCapture is_explicitly_captured is_init_capture

 

Defined in header <experimental/reflect>
template< class T > concept Object = /* see below */;		(reflection TS)

The Object concept is satisfied if and only if T is a meta-object type.

Example

Run this code

#include <experimental/reflect>
 
namespace reflect = std::experimental::reflect;
 
template<reflect::Object M>
struct meta_t {
    template<reflect::Object M1>
    friend constexpr bool operator==(meta_t, meta_t<M1>) noexcept
    {
        return reflect::reflects_same_v<M, M1>;
    }
    template<reflect::Object M1>
    friend constexpr bool operator!=(meta_t, meta_t<M1>) noexcept
    {
        return !reflect::reflects_same_v<M, M1>;
    }
};
 
template<reflect::Object M>
constexpr meta_t<M> meta{};
 
int main()
{
    static_assert(meta<reflexpr(int)> == meta<reflexpr(signed int)>, "");
    // meta<int>; // error: int is not a meta-object type
}