46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package stack
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// Boolean represents a boolean value on the stack
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type Boolean struct {
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*abstractItem
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val bool
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}
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//NewBoolean returns a new boolean stack item
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func NewBoolean(val bool) *Boolean {
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return &Boolean{
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&abstractItem{},
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val,
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}
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}
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// Boolean overrides the default implementation
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// by the abstractItem, returning a Boolean struct
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func (b *Boolean) Boolean() (*Boolean, error) {
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return b, nil
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}
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// Value returns the underlying boolean value
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func (b *Boolean) Value() bool {
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return b.val
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}
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// Not returns a Boolean whose underlying value is flipped.
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// If the value is True, it is flipped to False and viceversa
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func (b *Boolean) Not() *Boolean {
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return NewBoolean(!b.Value())
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}
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// And returns a Boolean whose underlying value is obtained
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// by applying the && operator to two Booleans' values.
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func (b *Boolean) And(a *Boolean) *Boolean {
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c := b.Value() && a.Value()
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return NewBoolean(c)
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}
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// Or returns a Boolean whose underlying value is obtained
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// by applying the || operator to two Booleans' values.
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func (b *Boolean) Or(a *Boolean) *Boolean {
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c := b.Value() || a.Value()
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return NewBoolean(c)
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}
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