File: p8-2a.cpp

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (32 lines) | stat: -rw-r--r-- 856 bytes parent folder | download | duplicates (15) 
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