File: sfinae47.C

package info (click to toggle)
gcc-arm-none-eabi 15%3A7-2018-q2-5
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 539,188 kB
  • sloc: ansic: 2,739,935; cpp: 848,238; ada: 602,637; makefile: 62,919; asm: 55,635; xml: 46,238; exp: 23,020; sh: 19,616; python: 6,371; pascal: 3,889; awk: 3,278; perl: 2,691; yacc: 316; ml: 285; f90: 234; lex: 198; objc: 194; haskell: 119
file content (25 lines) | stat: -rw-r--r-- 409 bytes parent folder | download | duplicates (10) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
 
// Source: Comment 16 of PR51213
// { dg-do compile { target c++11 } }

template <class T>
T && declval();

template <class T>
constexpr auto hasSize(int) -> decltype(declval<T&>().size(), bool())
{ return true; }

template <class T>
constexpr bool hasSize(...)
{ return false; }

struct A
{
  int size();
};

struct B : private A
{
};

static_assert(hasSize<A>(0),  "A");
static_assert(!hasSize<B>(0), "B");