File: concepts-no-early-substitution.cpp

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (33 lines) | stat: -rw-r--r-- 611 bytes parent folder | download | duplicates (12) 
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
33
 
// RUN: %clang_cc1 -std=c++20 -x c++ %s -verify -fsyntax-only
// expected-no-diagnostics

template <typename T0>
concept HasMemberBegin = requires(T0 t) { t.begin(); };

struct GetBegin {
  template <HasMemberBegin T1>
  void operator()(T1);
};

GetBegin begin;

template <typename T2>
concept Concept = requires(T2 t) { begin(t); };

struct Subrange;

template <typename T3>
struct View {
  Subrange &getSubrange();

  operator bool()
    requires true;

  operator bool()
    requires requires { begin(getSubrange()); };

  void begin();
};

struct Subrange : View<void> {};
static_assert(Concept<Subrange>);