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590160ddbb
The added helper functions - SetLength() and ExtendCapacity() - replace error-prone code with simple function calls.
24 lines
639 B
Go
24 lines
639 B
Go
package slicesutil
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// ExtendCapacity returns a with the capacity extended to len(a)+itemsToAdd.
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//
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// It may allocate new slice if cap(a) is smaller than len(a)+itemsToAdd.
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func ExtendCapacity[T any](a []T, itemsToAdd int) []T {
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aLen := len(a)
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if n := aLen + itemsToAdd - cap(a); n > 0 {
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a = append(a[:cap(a)], make([]T, n)...)
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return a[:aLen]
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}
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return a
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}
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// SetLength sets len(a) to newLen and returns the result.
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//
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// It may allocate new slice if cap(a) is smaller than newLen.
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func SetLength[T any](a []T, newLen int) []T {
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if n := newLen - cap(a); n > 0 {
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a = append(a[:cap(a)], make([]T, n)...)
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}
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return a[:newLen]
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}
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