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Merge pull request #3848 from petrroll/patch-1

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[go/en] Clarify safety of taking local variable address.
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Divay Prakash 2020-02-09 22:17:35 +05:30 committed by GitHub
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@ -168,10 +168,11 @@ func learnNamedReturns(x, y int) (z int) {
// Go is fully garbage collected. It has pointers but no pointer arithmetic.
// You can make a mistake with a nil pointer, but not by incrementing a pointer.
// Unlike in C/Cpp taking and returning an address of a local varible is also safe.
func learnMemory() (p, q *int) {
// Named return values p and q have type pointer to int.
p = new(int) // Built-in function new allocates memory.
// The allocated int is initialized to 0, p is no longer nil.
// The allocated int slice is initialized to 0, p is no longer nil.
s := make([]int, 20) // Allocate 20 ints as a single block of memory.
s[3] = 7 // Assign one of them.
r := -2 // Declare another local variable.