49 lines
1.2 KiB
Markdown
49 lines
1.2 KiB
Markdown
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# size - calculates variable's memory consumption at runtime
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### Part of the [Transflow Project](http://transflow.ru/)
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Sometimes you may need a tool to measure the size of object in your Go program at runtime. This package makes an attempt to do so. Package based on `binary.Size()` from Go standard library.
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Features:
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- supports non-fixed size variables and struct fields: `struct`, `int`, `slice`, `string`, `map`;
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- supports complex types including structs with non-fixed size fields;
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- supports all basic types (numbers, bool);
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- supports `chan` and `interface`;
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- supports pointers;
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- implements infinite recursion detection (i.e. pointer inside struct field references to parent struct).
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### Usage example
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```
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package main
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import (
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"fmt"
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// Use latest tag.
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"github.com/DmitriyVTitov/size"
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)
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func main() {
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a := struct {
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a int
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b string
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c bool
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d int32
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e []byte
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f [3]int64
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}{
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a: 10, // 8 bytes
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b: "Text", // 16 (string itself) + 4 = 20 bytes
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c: true, // 1 byte
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d: 25, // 4 bytes
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e: []byte{'c', 'd', 'e'}, // 24 (slice itself) + 3 = 27 bytes
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f: [3]int64{1, 2, 3}, // 3 * 8 = 24 bytes
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} // 84 + 3 (padding) = 87 bytes
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fmt.Println(size.Of(a))
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}
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// Output: 87
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```
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