clang/test/Analysis/lambdas-generalized-capture.cpp


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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

// RUN: %clang_analyze_cc1 -std=c++14 -analyzer-checker=core,deadcode,debug.ExprInspection -verify %s

int clang_analyzer_eval(int);

void generalizedCapture() {
  int v = 7;
  auto lambda = [x=v]() {
    return x;
  };

  int result = lambda();
  clang_analyzer_eval(result == 7); // expected-warning {{TRUE}}
}

void sideEffectsInGeneralizedCapture() {
  int v = 7;
  auto lambda = [x=v++]() {
    return x;
  };
  clang_analyzer_eval(v == 8); // expected-warning {{TRUE}}

  int r1 = lambda();
  int r2 = lambda();
  clang_analyzer_eval(r1 == 7); // expected-warning {{TRUE}}
  clang_analyzer_eval(r2 == 7); // expected-warning {{TRUE}}
  clang_analyzer_eval(v == 8); // expected-warning {{TRUE}}
}

int addOne(int p) {
 return p + 1;
}

void inliningInGeneralizedCapture() {
  int v = 7;
  auto lambda = [x=addOne(v)]() {
    return x;
  };

  int result = lambda();
  clang_analyzer_eval(result == 8); // expected-warning {{TRUE}}
}

void caseSplitInGeneralizedCapture(bool p) {
  auto lambda = [x=(p ? 1 : 2)]() {
    return x;
  };

  int result = lambda();
  clang_analyzer_eval(result == 1); // expected-warning {{FALSE}} expected-warning {{TRUE}}
}