1 // RUN: %check_clang_tidy -std=c++11-or-later %s cppcoreguidelines-misleading-capture-default-by-value %t
2 
3 struct Obj {
lambdas_that_warn_default_capture_copyObj4   void lambdas_that_warn_default_capture_copy() {
5     int local{};
6     int local2{};
7 
8     auto explicit_this_capture = [=, this]() { };
9     // CHECK-MESSAGES: :[[@LINE-1]]:35: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
10     // CHECK-FIXES: auto explicit_this_capture = [this]() { };
11 
12     auto explicit_this_capture_locals1 = [=, this]() { return (local+x) > 10; };
13     // CHECK-MESSAGES: :[[@LINE-1]]:43: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
14     // CHECK-FIXES: auto explicit_this_capture_locals1 = [local, this]() { return (local+x) > 10; };
15 
16     auto explicit_this_capture_locals2 = [=, this]() { return (local+local2) > 10; };
17     // CHECK-MESSAGES: :[[@LINE-1]]:43: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
18     // CHECK-FIXES: auto explicit_this_capture_locals2 = [local, local2, this]() { return (local+local2) > 10; };
19 
20     auto explicit_this_capture_local_ref = [=, this, &local]() { return (local+x) > 10; };
21     // CHECK-MESSAGES: :[[@LINE-1]]:45: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
22     // CHECK-FIXES: auto explicit_this_capture_local_ref = [this, &local]() { return (local+x) > 10; };
23 
24     auto explicit_this_capture_local_ref2 = [=, &local, this]() { return (local+x) > 10; };
25     // CHECK-MESSAGES: :[[@LINE-1]]:46: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
26     // CHECK-FIXES: auto explicit_this_capture_local_ref2 = [&local, this]() { return (local+x) > 10; };
27 
28     auto explicit_this_capture_local_ref3 = [=, &local, this, &local2]() { return (local+x) > 10; };
29     // CHECK-MESSAGES: :[[@LINE-1]]:46: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
30     // CHECK-FIXES: auto explicit_this_capture_local_ref3 = [&local, this, &local2]() { return (local+x) > 10; };
31 
32     auto explicit_this_capture_local_ref4 = [=, &local, &local2, this]() { return (local+x) > 10; };
33     // CHECK-MESSAGES: :[[@LINE-1]]:46: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
34     // CHECK-FIXES: auto explicit_this_capture_local_ref4 = [&local, &local2, this]() { return (local+x) > 10; };
35 
36     auto explicit_this_capture_local_ref_extra_whitespace = [=, &  local, &local2, this]() { return (local+x) > 10; };
37     // CHECK-MESSAGES: :[[@LINE-1]]:62: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
38     // CHECK-FIXES: auto explicit_this_capture_local_ref_extra_whitespace = [&  local, &local2, this]() { return (local+x) > 10; };
39 
40     auto explicit_this_capture_local_ref_with_comment = [=, & /* byref */ local, &local2, this]() { return (local+x) > 10; };
41     // CHECK-MESSAGES: :[[@LINE-1]]:58: warning: lambdas that capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
42     // CHECK-FIXES: auto explicit_this_capture_local_ref_with_comment = [& /* byref */ local, &local2, this]() { return (local+x) > 10; };
43 
44     auto implicit_this_capture = [=]() { return x > 10; };
45     // CHECK-MESSAGES: :[[@LINE-1]]:35: warning: lambdas that implicitly capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
46     // CHECK-FIXES: auto implicit_this_capture = [this]() { return x > 10; };
47 
48     auto implicit_this_capture_local = [=]() { return (local+x) > 10; };
49     // CHECK-MESSAGES: :[[@LINE-1]]:41: warning: lambdas that implicitly capture 'this' should not specify a by-value capture default [cppcoreguidelines-misleading-capture-default-by-value]
50     // CHECK-FIXES: auto implicit_this_capture_local = [local, this]() { return (local+x) > 10; };
51   }
52 
lambdas_that_dont_warn_default_capture_refObj53   void lambdas_that_dont_warn_default_capture_ref() {
54     int local{};
55     int local2{};
56 
57     auto ref_explicit_this_capture = [&, this]() { };
58     auto ref_explicit_this_capture_local = [&, this]() { return (local+x) > 10; };
59 
60     auto ref_implicit_this_capture = [&]() { return x > 10; };
61     auto ref_implicit_this_capture_local = [&]() { return (local+x) > 10; };
62     auto ref_implicit_this_capture_locals = [&]() { return (local+local2+x) > 10; };
63   }
64 
lambdas_that_dont_warnObj65   void lambdas_that_dont_warn() {
66     int local{};
67     int local2{};
68     auto explicit_this_capture = [this]() { };
69     auto explicit_this_capture_local = [this, local]() { return local > 10; };
70     auto explicit_this_capture_local_ref = [this, &local]() { return local > 10; };
71 
72     auto no_captures = []() {};
73     auto capture_local_only = [local]() {};
74     auto ref_capture_local_only = [&local]() {};
75     auto capture_many = [local, &local2]() {};
76   }
77 
78   int x;
79 };
80