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Source file src/encoding/gob/error.go

Documentation: encoding/gob

  // Copyright 2009 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package gob
  
  import "fmt"
  
  // Errors in decoding and encoding are handled using panic and recover.
  // Panics caused by user error (that is, everything except run-time panics
  // such as "index out of bounds" errors) do not leave the file that caused
  // them, but are instead turned into plain error returns. Encoding and
  // decoding functions and methods that do not return an error either use
  // panic to report an error or are guaranteed error-free.
  
  // A gobError is used to distinguish errors (panics) generated in this package.
  type gobError struct {
  	err error
  }
  
  // errorf is like error_ but takes Printf-style arguments to construct an error.
  // It always prefixes the message with "gob: ".
  func errorf(format string, args ...interface{}) {
  	error_(fmt.Errorf("gob: "+format, args...))
  }
  
  // error wraps the argument error and uses it as the argument to panic.
  func error_(err error) {
  	panic(gobError{err})
  }
  
  // catchError is meant to be used as a deferred function to turn a panic(gobError) into a
  // plain error. It overwrites the error return of the function that deferred its call.
  func catchError(err *error) {
  	if e := recover(); e != nil {
  		ge, ok := e.(gobError)
  		if !ok {
  			panic(e)
  		}
  		*err = ge.err
  	}
  }
  

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