为什么const变量有时不需要在lambda中被捕获?

Consider the following example:

考虑下面的例子:

#include <cstdlib>

int main() {
    const int m = 42;
    [] { m; }(); // OK

    const int n = std::rand();
    [] { n; }(); // error: 'n' is not captured
}
#i