1.. title:: clang-tidy - performance-move-const-arg
2
3performance-move-const-arg
4==========================
5
6The check warns
7
8- if ``std::move()`` is called with a constant argument,
9
10- if ``std::move()`` is called with an argument of a trivially-copyable type,
11
12- if the result of ``std::move()`` is passed as a const reference argument.
13
14In all three cases, the check will suggest a fix that removes the
15``std::move()``.
16
17Here are examples of each of the three cases:
18
19.. code-block:: c++
20
21  const string s;
22  return std::move(s);  // Warning: std::move of the const variable has no effect
23
24  int x;
25  return std::move(x);  // Warning: std::move of the variable of a trivially-copyable type has no effect
26
27  void f(const string &s);
28  string s;
29  f(std::move(s));  // Warning: passing result of std::move as a const reference argument; no move will actually happen
30
31Options
32-------
33
34.. option:: CheckTriviallyCopyableMove
35
36   If `true`, enables detection of trivially copyable types that do not
37   have a move constructor. Default is `true`.
38