new(float*)[]和new float*[]之间的区别

Question

有什么区别:new int*[]和new (int*)[]:

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]

要求分配一个数组？在'浮动'位置(这是没有意义的),这是你得到的错误.这是放置新语法,请参阅更多信息这里新的(float*)[]和新的float*[]或http://en.cppreference.com/w/cpp/language/new 之间的区别在评论中指出