c++ - new (float*)[] 和 new float*[] 的区别

Question

new int*[] 和 new (int*)[] 之间有什么区别:

int** pA = new int*[2] // returns a pointer to an array of pointers to int.

new (int*)[2] // what should this return ? Shouldn't it be same as the above. 

同样，

float* pB1 = new float[3]; // compiles successfully.

float* pB2 = new (float)[3] //Gives an error. Shouln't it return an array of floats ?

但是，编译器说:

A value of type 'float' cannot be used to initialize a value of type float* .

我在这里错过了什么？我正在使用 VS2015 社区 IDE。

Answer 1

float* pB1 = new float[3];

正在分配一个float数组

float* pB2 = new (float)[3]

要求分配一个 ??在“ float ”位置(无意义)，这就是您遇到的错误。这是放置新语法，请在此处查看更多信息 Difference between new (float*)[] and new float*[]或 http://en.cppreference.com/w/cpp/language/new正如评论中指出的