1 // RUN: %check_clang_tidy %s hicpp-ignored-remove-result %t
2 // RUN: %check_clang_tidy -check-suffixes=NOCAST %s hicpp-ignored-remove-result %t -- -config='{CheckOptions: {hicpp-ignored-remove-result.AllowCastToVoid: false}}'
3
4 namespace std {
5
6 template <typename ForwardIt, typename T>
7 ForwardIt remove(ForwardIt, ForwardIt, const T &);
8
9 template <typename ForwardIt, typename UnaryPredicate>
10 ForwardIt remove_if(ForwardIt, ForwardIt, UnaryPredicate);
11
12 template <typename ForwardIt>
13 ForwardIt unique(ForwardIt, ForwardIt);
14
15 template <class InputIt, class T>
16 InputIt find(InputIt, InputIt, const T&);
17
18 struct unique_disposable {
19 void* release();
20 };
21
22 class error_code {
23 };
24
25 } // namespace std
26
errorFunc()27 std::error_code errorFunc() {
28 return std::error_code();
29 }
30
warning()31 void warning() {
32 std::remove(nullptr, nullptr, 1);
33 // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
34 // CHECK-MESSAGES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning
35 // CHECK-MESSAGES-NOCAST: [[@LINE-3]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
36
37 std::remove_if(nullptr, nullptr, nullptr);
38 // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
39 // CHECK-MESSAGES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning
40 // CHECK-MESSAGES-NOCAST: [[@LINE-3]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
41
42 std::unique(nullptr, nullptr);
43 // CHECK-MESSAGES: [[@LINE-1]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
44 // CHECK-MESSAGES: [[@LINE-2]]:3: note: cast the expression to void to silence this warning
45 // CHECK-MESSAGES-NOCAST: [[@LINE-3]]:3: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
46 }
47
optionalWarning()48 void optionalWarning() {
49 // No warning unless AllowCastToVoid=false
50 (void)std::remove(nullptr, nullptr, 1);
51 // CHECK-MESSAGES-NOCAST: [[@LINE-1]]:9: warning: the value returned by this function should not be disregarded; neglecting it may lead to errors
52 }
53
noWarning()54 void noWarning() {
55
56 auto RemoveRetval = std::remove(nullptr, nullptr, 1);
57
58 auto RemoveIfRetval = std::remove_if(nullptr, nullptr, nullptr);
59
60 auto UniqueRetval = std::unique(nullptr, nullptr);
61
62 // Verify that other checks in the baseclass are not used.
63 // - no warning on std::find since the checker overrides
64 // bugprone-unused-return-value's checked functions.
65 std::find(nullptr, nullptr, 1);
66 // - no warning on return types since the checker disable
67 // bugprone-unused-return-value's checked return types.
68 errorFunc();
69 (void) errorFunc();
70
71 std::unique_disposable{}.release();
72 }
73