英文:
What is a string in Go?
问题
Go中的“string”类型类似于C中的“char*”（或“char[]”）或C++中的类“string”吗？还是其他什么东西？
我不明白一个字符串如何成为原始类型。
英文:
Is a string in Go is like a char* in C (or a char[]) or a class string in C++... or something else?
I don't understand how a string can be a primitive type.
答案1
得分: 17
在Go中，字符串是由C中的这个结构表示的：
struct String
{
byte* str;
intgo len;
};
str指针指向实际的字符串数据，但它没有以空字符结尾 - 长度保存在len成员中。
因此，从C的角度来看，Go字符串与原始类型相差甚远，它是一个指针、一个长度和一块内存区域。
然而，Go不是C，所有这些实现细节对Go程序是不可见的。在Go中，字符串是一种原始的不可变类型。
英文:
A string in go is represented by this structure in C
struct String
{
byte* str;
intgo len;
};
The str pointer points to the actual string data but this is not null terminated - the length is held in the len member.
So in C terms a go string is a long way from a primitive type, it is a pointer, a length and an area of memory.
However Go is not C and all of those implementation details are invisible to Go programs. In Go a string is a primitive immutable type.
答案2
得分: 6
string类型的文档中说：
> string是由所有8位字节组成的字符串集合，通常但不一定表示UTF-8编码的文本。字符串可以为空，但不能为nil。string类型的值是不可变的。
它们是不可变的，这似乎使它们与你进行比较的C概念不太相似，更像是const char []，其中的const确实意味着const。
在编程语言中，任何东西都可以是原始类型，这取决于设计者。"作为原始类型"并不一定意味着实际上是原始的，你知道的。 
英文:
The documentation for the type string says:
> string is the set of all strings of 8-bit bytes, conventionally but not necessarily representing UTF-8-encoded text. A string may be empty, but not nil. Values of string type are immutable.
They are immutable, which would seem to make them less like the C concepts you compare to, and more like maybe a const char [] where the const really means const.
Anything can be a primitive type in a programming language, it's up to the designers. "Being a primitive" doesn't have to mean actually being, you know, primitive.
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