C++ではnull pointerをdeleteしても安全だった

諸事情でC++のreferenceを見ていて発見した。

If expression evaluates to a null pointer value, no destructors are called, and the deallocation function may or may not be called (it's implementation-defined), but the default deallocation functions are guaranteed to do nothing when handed a null pointer.
(until C++14)

If expression evaluates to a null pointer value, no destructors are called, and the deallocation function is not called.
(since C++14)

C++14を境に微妙に動作が異なるが、null pointerをdeleteしても何も起きないようだ。

やったねif文が減らせるよ！

//現在
if(p){
    delete p;
}

//これから
delete p;