misc-move-const-arg¶
The check warns
- if std::move() is called with a constant argument,
- if std::move() is called with an argument of a trivially-copyable type,
- if the result of std::move() is passed as a const reference argument.
In all three cases, the check will suggest a fix that removes the std::move().
Here are examples of each of the three cases:
const string s;
return std::move(s); // Warning: std::move of the const variable has no effect
int x;
return std::move(x); // Warning: std::move of the variable of a trivially-copyable type has no effect
void f(const string &s);
string s;
f(std::move(s)); // Warning: passing result of std::move as a const reference argument; no move will actually happen