Provide a compile-time check for determining arithmetic types.
More...
Detailed Description
- Outline
-
-
- Purpose:
- Provide a compile-time check for determining arithmetic types.
-
- Classes:
-
- See also:
- Component bslmf_integralconstant
-
- Description:
- This component defines a meta-function,
bsl::is_arithmetic
and a template variable bsl::is_arithmetic_v
that represents the result value of the bsl::is_arithmetic
meta-function, that may be used to query whether a template parameter type is an arithmetic type.
bsl::is_arithmetic
meets the requirements of the is_arithmetic
template defined in the C++11 standard [meta.unary.comp].
- Note that the template variable
is_arithmetic_v
is defined in the C++17 standard as an inline variable. If the current compiler supports the inline variable C++17 compiler feature, bsl::is_arithmetic_v
is defined as an inline constexpr bool
variable. Otherwise, if the compiler supports the variable templates C++14 compiler feature, bsl::is_arithmetic_v
is defined as a non-inline constexpr bool
variable. See BSLS_COMPILERFEATURES_SUPPORT_INLINE_VARIABLES
and BSLS_COMPILERFEATURES_SUPPORT_VARIABLE_TEMPLATES
macros in bsls_compilerfeatures component for details.
-
- Usage:
- In this section we show intended use of this component.
-
- Example 1: Verify Arithmetic Types:
- Suppose that we want to assert whether a set of types are arithmetic types.
- Now, we instantiate the
bsl::is_arithmetic
template for these types, and assert the value
static data member of each instantiation: Note that if the current compiler supports the variable templates C++14 feature then we can re-write the snippet of code above using the bsl::is_arithmetic_v
variable as follows: #ifdef BSLS_COMPILERFEATURES_SUPPORT_VARIABLE_TEMPLATES
assert(false == bsl::is_arithmetic_v<int& >);
assert(false == bsl::is_arithmetic_v<int *>);
assert(true == bsl::is_arithmetic_v<int >);
#endif