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package stringsx
import "sync"
// Pool implements a string pool safe for concurrent use.
//
// For details, see https://stackoverflow.com/a/51983331/1705598
type Pool struct {
mu sync.Mutex
cache map[string]string
}
// NewPool returns a new, empty string pool.
func NewPool() *Pool {
return &Pool{
cache: map[string]string{},
}
}
// Interned returns the string instance from the pool that is equal to s.
// If s is not yet in the pool, it is put into it and returned.
func (p *Pool) Interned(s string) string {
p.mu.Lock()
defer p.mu.Unlock()
if s2, ok := p.cache[s]; ok {
return s2
}
// New string, store it
p.cache[s] = s
return s
}
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