Getting the pointer to string literals in Go can be achieved by: 1. Use variables to get the address, first declare the string variable and then use the & operator to get the address; 2. Return the string pointer through the function, you can define the function or use an anonymous function to directly pass the literals; 3. Declare the *string type field in the structure and assign a value; 4. Use anonymous variables and compound literals to write temporarily. These methods are suitable for different scenarios, such as ordinary assignment, structure initialization, or where concise code is needed. Although the form is different, the core is to convert the string literal into addressable variables before obtaining its pointer.
Getting pointers to string literals in Go is actually a very common problem, especially when you need to pass strings as pointers to functions or structure fields. While the string itself is a value type, Go provides a very concise way to do this.
Use the & operator to get the address directly
The easiest way is to use the & operator to get the address of a string variable. Although you can't use &"hello" directly for literals, you can declare a string variable first and then take its address:
s := "hello" sp := &s
This way you get a pointer to the string *string . This approach works for most scenarios, especially when you want to pass a string to a function that accepts a pointer.
Return a string pointer through a function
If you want a line of code to be done, you can write a small function or use a short declaration to create a string and return its pointer:
func strPtr(s string) *string {
return &s
}
//How to use:
p := strPtr("hello")Or a little more compact:
p := func(s string) *string { return &s }("hello")Although it looks a bit tangible, it will be more convenient when initializing the structure field.
Use string pointer fields in structure
When you define a structure and want a field to be a pointer to a string, you can directly declare it as *string type:
type User struct {
Name string
Bio *string
}
bio := "loves coding"
user := User{
Name: "Alice",
Bio: &bio,
} This way you can flexibly determine whether the field is empty (such as Bio == nil ), rather than relying on an empty string.
Tips: Quickly create zero-time writing of string pointers
If you don't want to declare variables separately every time, and want to keep the code concise, you can combine anonymous variables with composite literals:
p := (*string)(&"temporary")
Although this is a bit weird, it does generate a pointer to a string constant. However, it should be noted that this writing method is not readable and is recommended to only be used in special occasions.
- Actually equivalent to:
- Created a temporary variable
"temporary" - Take its address
- Convert to
*stringtype
- Created a temporary variable
Basically these methods. Not complicated, but it is easy to encounter in actual development.
The above is the detailed content of How to get a pointer to a string literal in Go?. For more information, please follow other related articles on the PHP Chinese website!
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