The "reflect" package in Go provides a way to inspect and manipulate Go objects such as variables, structs, and interfaces at runtime. It provides a set of functions to get information about an object's type, its fields, methods, and values. It also allows modifying the values and invoking the methods of the object dynamically.
Code Examples:
1. Value Pointer Example:
The Value.Pointer method returns a pointer to the data represented by the reflect value. This example creates a reflect.Value object representing a string variable and gets its pointer:
package main
import ( "fmt" "reflect" )
func main() { str := "Hello, World!" value := reflect.ValueOf(str)
In this example, reflect.ValueOf creates a new Value struct representing the string "Hello, World!". The Value.Pointer method is then called to retrieve a uintptr to the underlying data in the string variable.
2. Value Set Pointer Example:
The Value.SetPointer method sets the data pointer of the value to the given pointer. This allows updating the value of a variable dynamically.
package main
import ( "fmt" "reflect" )
func main() { var str string = "Hello" value := reflect.ValueOf(&str).Elem() ptr := value.Pointer()
Output: Old Pointer: uintptr(123145200) New Pointer: uintptr(1234567890) String Value: S☻☼
This example creates a new Value struct representing a pointer to string variable "str". The Value.Pointer method is then called to retrieve a uintptr to the underlying data in the string variable.
The Value.SetPointer method is then called to set the data pointer to a new value 1234567890, which updates the value of the string variable dynamically.
We can observe that the old pointer is different from the new pointer and the string value is also updated as per the new pointer.
Package Library: reflect
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