File: p8-2a.cpp

package info (click to toggle)
llvm-toolchain-21 1%3A21.1.6-3
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,245,028 kB
  • sloc: cpp: 7,619,726; ansic: 1,434,018; asm: 1,058,748; python: 252,740; f90: 94,671; objc: 70,685; lisp: 42,813; pascal: 18,401; sh: 8,601; ml: 5,111; perl: 4,720; makefile: 3,675; awk: 3,523; javascript: 2,409; xml: 892; fortran: 770
file content (32 lines) | stat: -rw-r--r-- 856 bytes parent folder | download | duplicates (14) 
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
26
27
28
29
30
31
32
 
// RUN: %clang_cc1 -std=c++20 -verify %s

// expected-no-diagnostics

namespace P1937R2 {
struct N {
  constexpr N() {}
  N(N const&) = delete;
};

template<typename T> constexpr void bad_assert_copyable() { T t; T t2 = t; }
using ineffective = decltype(bad_assert_copyable<N>());

template<typename T> consteval void assert_copyable() { T t; T t2 = t; }
// Prior to P1937R2 consteval functions were evaluated even in otherwise
// unevaluated context, now this is well-formed.
using check = decltype(assert_copyable<N>());

template<typename T>
__add_rvalue_reference(T) declval();

constexpr auto add1(auto lhs, auto rhs) {
    return lhs + rhs;
}
using T = decltype(add1(declval<int>(), declval<int>()));

consteval auto add2(auto lhs, auto rhs) {
    return lhs + rhs;
}
using T = decltype(add2(declval<int>(), declval<int>()));
} // namespace P1937R2