std::experimental::reflect::get_source_line

< cpp‎ | experimental‎ | reflect

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.

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.

#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

line	return the line number represented by this object (public member function of `std::source_location`)
source_line (C++23)	gets the line number that lexically relates the evaluation represented by the `stacktrace_entry` (public member function of `std::stacktrace_entry`)