code.vegaprotocol.io/vega@v0.79.0/libs/test/helpers.go (about)

     1  // Copyright (C) 2023 Gobalsky Labs Limited
     2  //
     3  // This program is free software: you can redistribute it and/or modify
     4  // it under the terms of the GNU Affero General Public License as
     5  // published by the Free Software Foundation, either version 3 of the
     6  // License, or (at your option) any later version.
     7  //
     8  // This program is distributed in the hope that it will be useful,
     9  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    10  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    11  // GNU Affero General Public License for more details.
    12  //
    13  // You should have received a copy of the GNU Affero General Public License
    14  // along with this program.  If not, see <http://www.gnu.org/licenses/>.
    15  
    16  package test
    17  
    18  import (
    19  	"sync"
    20  )
    21  
    22  func OnlyOnce(f func()) func() {
    23  	var once sync.Once
    24  
    25  	return func() {
    26  		once.Do(f)
    27  	}
    28  }