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Trait class that identifies whether T is an integral type.
It inherits from integral_constant as being either true_type or false_type, depending on whether T is an integral type:
All fundamental integral types, along with all their aliases (like those in cstdint), are considered integral types by this class, including their const and volatile qualified variants.
Enums are not considered integral types in C++ (see is_enum).
Output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<type_traits>
helper classes
-
false_typeC++11
-
integral_constantC++11
-
true_typeC++11
-
type traits
-
alignment_ofC++11
-
extentC++11
-
has_virtual_destructorC++11
-
is_abstractC++11
-
is_arithmeticC++11
-
is_arrayC++11
-
is_assignableC++11
-
is_base_ofC++11
-
is_classC++11
-
is_compoundC++11
-
is_constC++11
-
is_constructibleC++11
-
is_convertibleC++11
-
is_copy_assignableC++11
-
is_copy_constructibleC++11
-
is_default_constructibleC++11
-
is_destructibleC++11
-
is_emptyC++11
-
is_enumC++11
-
is_floating_pointC++11
-
is_functionC++11
-
is_fundamentalC++11
-
is_integralC++11
-
is_literal_typeC++11
-
is_lvalue_referenceC++11
-
is_member_function_pointerC++11
-
is_member_object_pointerC++11
-
is_member_pointerC++11
-
is_move_assignableC++11
-
is_move_constructibleC++11
-
is_nothrow_assignableC++11
-
is_nothrow_constructibleC++11
-
is_nothrow_copy_assignableC++11
-
is_nothrow_copy_constructibleC++11
-
is_nothrow_default_constructibleC++11
-
is_nothrow_destructibleC++11
-
is_nothrow_move_assignableC++11
-
is_nothrow_move_constructibleC++11
-
is_null_pointerC++14
-
is_objectC++11
-
is_podC++11
-
is_pointerC++11
-
is_polymorphicC++11
-
is_referenceC++11
-
is_rvalue_referenceC++11
-
is_sameC++11
-
is_scalarC++11
-
is_signedC++11
-
is_standard_layoutC++11
-
is_trivialC++11
-
is_trivially_assignableC++11
-
is_trivially_constructibleC++11
-
is_trivially_copy_assignableC++11
-
is_trivially_copy_constructibleC++11
-
is_trivially_copyableC++11
-
is_trivially_default_constructibleC++11
-
is_trivially_destructibleC++11
-
is_trivially_move_assignableC++11
-
is_trivially_move_constructibleC++11
-
is_unionC++11
-
is_unsignedC++11
-
is_voidC++11
-
is_volatileC++11
-
rankC++11
-
type transformations
-
add_constC++11
-
add_cvC++11
-
add_lvalue_referenceC++11
-
add_pointerC++11
-
add_rvalue_referenceC++11
-
add_volatileC++11
-
aligned_storageC++11
-
aligned_unionC++11
-
common_typeC++11
-
conditionalC++11
-
decayC++11
-
enable_ifC++11
-
make_signedC++11
-
make_unsignedC++11
-
remove_all_extentsC++11
-
remove_constC++11
-
remove_cvC++11
-
remove_extentC++11
-
remove_pointerC++11
-
remove_referenceC++11
-
remove_volatileC++11
-
result_ofC++11
-
underlying_typeC++11
-
- Reference
- <type_traits>
- is_integral
class template
<type_traits>
std::is_integral
template <class T> struct is_integral;
Is integral
- integral_constant
- is_integral
Trait class that identifies whether T is an integral type.
It inherits from integral_constant as being either true_type or false_type, depending on whether T is an integral type:
| fundamental integral types |
|---|
| bool |
| char |
| char16_t |
| char32_t |
| wchar_t |
| signed char |
| short int |
| int |
| long int |
| long long int |
| unsigned char |
| unsigned short int |
| unsigned int |
| unsigned long int |
| unsigned long long int |
All fundamental integral types, along with all their aliases (like those in cstdint), are considered integral types by this class, including their const and volatile qualified variants.
Enums are not considered integral types in C++ (see is_enum).
Template parameters
- T
- A type.
Member types
Inherited from integral_constant:| member type | definition |
|---|---|
| value_type | bool |
| type | either true_type or false_type |
Member constants
Inherited from integral_constant:| member constant | definition |
|---|---|
| value | either true or false |
Member functions
Inherited from integral_constant:- operator bool
- Returns value (public member function)
Example
|
|
Output:
is_integral: char: true int: true float: false |
See also
- is_floating_point
- Is floating point (class template)
- is_arithmetic
- Is arithmetic type (class template)
- is_fundamental
- Is fundamental type (class template)
- is_signed
- Is signed type (class template)
- is_unsigned
- Is unsigned type (class template)
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Spotted an error? contact us