performance-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