File: constexpr-tuple2.C

package info (click to toggle)
gcc-arm-none-eabi 15%3A8-2019-q3-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 571,828 kB
  • sloc: ansic: 2,937,651; cpp: 881,644; ada: 597,189; makefile: 65,528; asm: 56,499; xml: 46,621; exp: 24,747; sh: 19,684; python: 7,256; pascal: 4,370; awk: 3,497; perl: 2,695; yacc: 316; ml: 285; f90: 234; lex: 198; objc: 194; haskell: 119
file content (20 lines) | stat: -rw-r--r-- 498 bytes parent folder | download | duplicates (6) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
 
// PR c++/58910
// { dg-do compile { target c++11 } }

#include <tuple>

using namespace std;
struct t1{ constexpr t1(){} };
struct t2{ constexpr t2(){} };

int main()
{
  constexpr t1 T1;
  constexpr t2 T2;
  constexpr tuple<t1,t2> Tup1(T1,T2);
  constexpr tuple<t1,t1> Tup2(T1,T1);
  constexpr auto a=get<0>(Tup1 ); //works fine
  constexpr auto b=get<0>(Tup2 ); // error: 
  //'(const std::_Head_base<0ul, t1, true>*)(& Tup2)' 
  //is not a constant expression constexpr auto b=get<0>(Tup2 );
}