目录
概述
new：new(T)分配了零值填充的T类型的内存空间，并且返回其地址，即一个*T类型的值。其自身是一个指针．可用于初始化任何类型
make: 返回一个有初始值(非零)的T类型，而不是*T，其只能用来初始化：slice,map和channel三种类型。
func make(t Type, size ...IntegerType) Type
The make built-in function allocates and initializes an object of type
slice, map, or chan (only). Like new, the first argument is a type, not a
value. Unlike new, make's return type is the same as the type of its
argument, not a pointer to it. The specification of the result depends on
the type:
Slice: The size specifies the length. The capacity of the slice is
equal to its length. A second integer argument may be provided to
specify a different capacity; it must be no smaller than the
length. For example, make([]int, 0, 10) allocates an underlying array
of size 10 and returns a slice of length 0 and capacity 10 that is
backed by this underlying array.
Map: An empty map is allocated with enough space to hold the
specified number of elements. The size may be omitted, in which case
a small starting size is allocated.
Channel: The channel's buffer is initialized with the specified
buffer capacity. If zero, or the size is omitted, the channel is
unbuffered.
func new(Type) *Type
The new built-in function allocates memory. The first argument is a type,
not a value, and the value returned is a pointer to a newly
allocated zero value of that type.
代码示例
package main
import (
"fmt"
"reflect"
)
type Books struct {
Title,
Content,
Author string
}
func main() {
a := new([]int)
fmt.Println(a)
//输出&[]，ａ本身是一个地址
b := make([]int, 1)
fmt.Println(b)
//输出[0]，ｂ本身是一个slice对象，其内容默认为0
}