Go语言中make与new的区别详解-优快云博客

本文链接：https://blog.youkuaiyun.com/heart66_A/article/details/113838398

本文详细探讨了Go语言中make与new的区别。make()仅用于初始化slice、map和channel，返回已初始化的非零值对象。new()则为任意类型分配零值内存并返回其指针。此外，文章还解答了关于Go零值、返回零值指针的含义，以及为何在slice、map和channel中使用make()的原因。

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make和new的区别

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make和new的区别

作用对象

make 只能用于slice，chan，map 对这些对象进行初始化

new 用于 golang任意type 自定义类型和内置数据类型

语义

make(T,args) 初始化内置数据结构（slice，chan，map）

new(T) 根据传入的类型，分配一片零值的内存空间，并返回指向这片内存空间的指针 value *T ，显示的创建了对象的一个指针，而不必使用&T对获取该对象的地址。

官方

Allocation with `new`

Go has two allocation primitives, the built-in functions new and make. They do different things and apply to different types, which can be confusing, but the rules are simple. Let’s talk about new first. It’s a built-in function that allocates memory, but unlike its namesakes in some other languages it does not initialize the memory, it only zeros it. That is, new(T) allocates zeroed storage for a new item of type T and returns its address, a value of type *T. In Go terminology, it returns a pointer to a newly allocated zero value of type T.

核心意思：new不会初始化内存，new(T)只是分配一个零值的存储空间，并返回指向该空间的一个地址，这个值的类型*T，

Allocation with `make`

Back to allocation. The built-in function make(T,args) serves a purpose different from new(T). It creates slices, maps, and channels only, and it returns an initialized (not zeroed) value of type T (not *T). The reason for the distinction is that these three types represent, under the covers, references to data structures t