File: int-ptr-cast-SFINAE.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 (22 lines) | stat: -rw-r--r-- 947 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
 
// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++14
// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++17

void foo(int* a, int *b) {
  a -= b; // expected-error {{incompatible integer to pointer conversion assigning to 'int *' from}}
}

template<typename T> T declval();
struct true_type { static const bool value = true; };
struct false_type { static const bool value = false; };
template<bool, typename T, typename U> struct select { using type = T; };
template<typename T, typename U> struct select<false, T, U> { using type = U; };


template<typename T>
typename select<(sizeof(declval<T>() -= declval<T>(), 1) != 1), true_type, false_type>::type test(...);
template<typename T> false_type test(...);

template<typename T>
static const auto has_minus_assign = decltype(test<T>())::value;

static_assert(has_minus_assign<int*>, "failed"); // expected-error {{static assertion failed due to requirement 'has_minus_assign<int *>': failed}}