https://github.com/danielgatis/go-ptrloop

A helper to iterate over unsafe pointers.
https://github.com/danielgatis/go-ptrloop

c go golang pointer-arithmetic unsafe-pointers

Last synced: 11 months ago
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A helper to iterate over unsafe pointers.

• Host: GitHub
• URL: https://github.com/danielgatis/go-ptrloop
• Owner: danielgatis
• License: mit
• Created: 2020-05-27T20:10:04.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2020-09-26T04:34:33.000Z (over 5 years ago)
• Last Synced: 2025-02-08T20:47:32.753Z (about 1 year ago)
• Topics: c, go, golang, pointer-arithmetic, unsafe-pointers
• Language: Go
• Homepage:
• Size: 6.84 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# go-ptrloop

[![Go Report Card](https://goreportcard.com/badge/github.com/danielgatis/go-ptrloop?style=flat-square)](https://goreportcard.com/report/github.com/danielgatis/go-ptrloop)

[![License MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/danielgatis/go-ptrloop/master/LICENSE)

[![Go Doc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat-square)](https://godoc.org/github.com/danielgatis/go-ptrloop)

A helper to iterate over unsafe pointers.

## Install

```bash

go get -u github.com/danielgatis/go-ptrloop

```

And then import the package in your code:

```go

import "github.com/danielgatis/go-ptrloop/ptrloop"

```

### Example

An example described below is one of the use cases.

```go

package main

/*

#include 

#include 

char** createArray(int n) {

  char** array = (char **) malloc(n * sizeof(char *));

  for (int i = 0; i < n; ++i) {

    array[i] = strdup("hello!");

  }

  return array;

}

*/

import "C"

import (

	"fmt"

	"unsafe"

	"github.com/danielgatis/go-ptrloop/ptrloop"

)

func main() {

	n := 3

	array := C.createArray(C.int(n))

	ptrloop.Loop(unsafe.Pointer(array), int(n), func(ptr unsafe.Pointer, i int) bool {

		s := *(**C.char)(ptr)

		fmt.Printf("%v -> %v\n", i, C.GoString(s))

		return true

	})

}

```

```

❯ go run main.go

0 -> hello!

1 -> hello!

2 -> hello!

```

## License

Copyright (c) 2020-present [Daniel Gatis](https://github.com/danielgatis)

Licensed under [MIT License](./LICENSE)