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Go supports pointers,
allowing you to pass references to values and records
within your program.
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package main
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import "fmt"
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We’ll show how pointers work in contrast to values with
2 functions: zeroval and zeroptr. zeroval has an
int parameter, so arguments will be passed to it by
value. zeroval will get a copy of ival distinct
from the one in the calling function.
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func zeroval(ival int) {
ival = 0
}
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zeroptr in contrast has an *int parameter, meaning
that it takes an int pointer. The *iptr code in the
function body then dereferences the pointer from its
memory address to the current value at that address.
Assigning a value to a dereferenced pointer changes the
value at the referenced address.
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func zeroptr(iptr *int) {
*iptr = 0
}
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func main() {
i := 1
fmt.Println("initial:", i)
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zeroval(i)
fmt.Println("zeroval:", i)
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The &i syntax gives the memory address of i,
i.e. a pointer to i.
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zeroptr(&i)
fmt.Println("zeroptr:", i)
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Pointers can be printed too.
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fmt.Println("pointer:", &i)
}
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