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std::experimental::reflect:: get_source_line

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C++
Experimental
Extensions for reflection
Concepts
Meta-object operations
Variable
FunctionParameter
Callable
Variable and Callable
Namespace and Callable
ParenthesizedExpression
FunctionCallExpression
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Variable and Function
Defined in header <experimental/reflect>
template < Object T >
struct get_source_line ;
(reflection TS)

Provides the member constant value equal to the presumed line number of the declaration of the entity or typedef-name reflected by T .

Contents

Helper variable template

template < class T >
constexpr auto get_source_line_v = get_source_line < T > :: value ;
(reflection TS)

Inherited from std:: integral_constant

Member constants

value
[static]
the presumed line number of the declaration of the entity or typedef-name reflected by T
(public static member constant)

Member functions

operator std::uint_least32_t
converts the object to std:: uint_least32_t , returns value
(public member function)
operator()
(C++14)
returns value
(public member function)

Member types

Type Definition
value_type std:: uint_least32_t
type std:: integral_constant < std:: uint_least32_t , value >

Example

The following code shows the source code line of an object or a class.

Run this code 
#include<experimental/reflect>
#include<iostream>
using refl = std::experimental::reflect;
float f;
struct P{};
int main()
{
    std::cout << refl::get_source_line_v<reflexpr(f)> << '\n';
    std::cout << refl::get_source_line_v<reflexpr(P)> << '\n';
}

Output: 

6
7

See also

return the line number represented by this object
(public member function of std::source_location )
gets the line number that lexically relates the evaluation represented by the stacktrace_entry
(public member function of std::stacktrace_entry )