github.com/nevalang/neva@v0.23.1-0.20240507185603-7696a9bb8dda/internal/runtime/funcs/int_decr.go (about)

     1  package funcs
     2  
     3  import (
     4  	"context"
     5  
     6  	"github.com/nevalang/neva/internal/runtime"
     7  )
     8  
     9  type intDecr struct{}
    10  
    11  func (i intDecr) Create(io runtime.FuncIO, _ runtime.Msg) (func(context.Context), error) {
    12  	nIn, err := io.In.Port("n")
    13  	if err != nil {
    14  		return nil, err
    15  	}
    16  
    17  	nOut, err := io.Out.Port("n")
    18  	if err != nil {
    19  		return nil, err
    20  	}
    21  
    22  	return func(ctx context.Context) {
    23  		var n runtime.Msg
    24  
    25  		for {
    26  			select {
    27  			case <-ctx.Done():
    28  				return
    29  			case n = <-nIn:
    30  			}
    31  
    32  			select {
    33  			case <-ctx.Done():
    34  				return
    35  			case nOut <- runtime.NewIntMsg(n.Int() - 1):
    36  			}
    37  		}
    38  	}, nil
    39  }