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uint is a built-in unsigned integer type in Go whose size is determined strictly by the target compilation architecture (GOARCH). It represents non-negative whole numbers and is allocated as either 32 bits (e.g., on GOARCH=386 or arm) or 64 bits (e.g., on GOARCH=amd64 or arm64). This size is fixed during compilation, regardless of the host system compiling the code or the operating system executing the resulting binary.

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Technical Specifications

  • Memory Footprint: 4 bytes (32-bit) or 8 bytes (64-bit).
  • Value Range (32-bit): 0 to 4,294,967,295 (232−12^{32} - 1)
  • Value Range (64-bit): 0 to 18,446,744,073,709,551,615 (264−12^{64} - 1)
  • Zero Value: 0

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Type System Behavior

Go enforces strict typing. uint is an entirely distinct type from explicitly sized unsigned integers (uint32, uint64) and signed integers (int). Even on a 64-bit architecture where uint and uint64 share the exact same memory footprint and range, the compiler treats them as separate types. Implicit type coercion is strictly prohibited.

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Syntax and Operations

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Declaration and Initialization

package main

func main() {
    // Explicit declaration
    var x uint = 42

    // Short variable declaration with type conversion from an untyped integer constant
    y := uint(42)

    // Zero value initialization
    var z uint // z is 0
    
    // Blank identifier used to satisfy the compiler's unused variable constraint
    _, _, _ = x, y, z
}

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Type Conversion

Because uint is a distinct type, operations involving other integer types require explicit type conversion. 
package main

func main() {
    var a uint = 100
    var b uint64 = 200
    var c int = 50

    // Invalid: mismatched types
    // result := a + b 

    // Valid: explicit conversion to uint
    result1 := a + uint(b)

    // Valid: explicit conversion to uint64
    result2 := uint64(a) + b

    // Valid: converting signed to unsigned
    result3 := a + uint(c) 
    
    _, _, _ = result1, result2, result3
}

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Determining Architecture Size at Compile Time

You can programmatically reference the bit size of uint for the target architecture using the standard library’s math/bits package. This value is evaluated during compilation, not at runtime. 
package main

import (
    "fmt"
    "math/bits"
)

func main() {
    // bits.UintSize is a compile-time constant evaluating to either 32 or 64
    fmt.Printf("The size of uint on the target architecture is %d bits.\n", bits.UintSize)
}

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Overflow Behavior

Like all fixed-size integer types in Go, uint wraps around upon overflow or underflow. 
package main

func main() {
    var max uint = ^uint(0) // Bitwise NOT on 0 yields the maximum uint value
    max += 1                // Overflows to 0

    var min uint = 0
    min -= 1                // Underflows to the maximum uint value
    
    _, _ = max, min
}
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