File: for-range-copy-warn-on-all-auto-copies.cpp

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (40 lines) | stat: -rw-r--r-- 1,071 bytes parent folder | download | duplicates (11) 
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
 
// RUN: %check_clang_tidy %s performance-for-range-copy %t -- \
// RUN:     -config="{CheckOptions: [{key: "performance-for-range-copy.WarnOnAllAutoCopies", value: true}]}"

template <typename T>
struct Iterator {
  void operator++() {}
  const T& operator*() {
    static T* TT = new T();
    return *TT;
  }
  bool operator!=(const Iterator &) { return false; }
};
template <typename T>
struct View {
  T begin() { return T(); }
  T begin() const { return T(); }
  T end() { return T(); }
  T end() const { return T(); }
};

struct S {
  S();
  S(const S &);
  ~S();
  S &operator=(const S &);
};

void NegativeLoopVariableNotAuto() {
  for (S S1 : View<Iterator<S>>()) {
    S* S2 = &S1;
  }
}

void PositiveTriggeredForAutoLoopVariable() {
  for (auto S1 : View<Iterator<S>>()) {
    // CHECK-MESSAGES: [[@LINE-1]]:13: warning: the loop variable's type is not a reference type; this creates a copy in each iteration; consider making this a reference [performance-for-range-copy]
    // CHECK-FIXES: for (const auto& S1 : View<Iterator<S>>()) {
    S* S2 = &S1;
  }
}