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std::
is_union
From cppreference.com
<
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types
C++
Compiler support
Freestanding and hosted
Language
Standard library
Standard library headers
Named requirements
Feature test macros
(C++20)
Language support library
Concepts library
(C++20)
Diagnostics library
Memory management library
Metaprogramming library
(C++11)
General utilities library
Containers library
Iterators library
Ranges library
(C++20)
Algorithms library
Strings library
Text processing library
Numerics library
Date and time library
Input/output library
Filesystem library
(C++17)
Concurrency support library
(C++11)
Execution control library
(C++26)
Technical specifications
Symbols index
External libraries
[edit]
Metaprogramming library
Type traits
Type categories
is_void
(C++11)
is_null_pointer
(C++11)
(
DR*
)
is_array
(C++11)
is_pointer
(C++11)
is_enum
(C++11)
is_union
(C++11)
is_class
(C++11)
is_function
(C++11)
is_reference
(C++11)
is_object
(C++11)
is_scalar
(C++11)
is_compound
(C++11)
is_integral
(C++11)
is_floating_point
(C++11)
is_fundamental
(C++11)
is_arithmetic
(C++11)
is_lvalue_reference
(C++11)
is_rvalue_reference
(C++11)
is_member_pointer
(C++11)
is_member_object_pointer
(C++11)
is_member_function_pointer
(C++11)
Type properties
is_const
(C++11)
is_volatile
(C++11)
is_empty
(C++11)
is_polymorphic
(C++11)
is_final
(C++14)
is_abstract
(C++11)
is_aggregate
(C++17)
is_implicit_lifetime
(C++23)
is_trivial
(C++11)
(deprecated in C++26)
is_trivially_copyable
(C++11)
is_standard_layout
(C++11)
is_literal_type
(C++11)
(
until C++20*
)
is_pod
(C++11)
(deprecated in C++20)