internal

Documentation

Index

• Constants
• Variables
• func ParseFloat(s []byte, bitSize int) (f float64, err error)
• func ParseInt(s []byte, base int, bitSize int) (i int64, err error)
• func ParseUint(s []byte, base int, bitSize int) (n uint64, err error)
• type NumError
  • func (e *NumError) Error() string

Constants

const IntSize = intSize

IntSize is the size in bits of an int or uint value.

Variables

var ErrRange = errors.New("value out of range")

ErrRange indicates that a value is out of range for the target type.

var ErrSyntax = errors.New("invalid syntax")

ErrSyntax indicates that a value does not have the right syntax for the target type.

Functions

func ParseFloat

func ParseFloat(s []byte, bitSize int) (f float64, err error)

ParseFloat converts the string s to a floating-point number with the precision specified by bitSize: 32 for float32, or 64 for float64. When bitSize=32, the result still has type float64, but it will be convertible to float32 without changing its value.

If s is well-formed and near a valid floating point number, ParseFloat returns the nearest floating point number rounded using IEEE754 unbiased rounding.

The errors that ParseFloat returns have concrete type *NumError and include err.Num = s.

If s is not syntactically well-formed, ParseFloat returns err.Err = ErrSyntax.

If s is syntactically well-formed but is more than 1/2 ULP away from the largest floating point number of the given size, ParseFloat returns f = ±Inf, err.Err = ErrRange.

func ParseInt

func ParseInt(s []byte, base int, bitSize int) (i int64, err error)

ParseInt interprets a string s in the given base (2 to 36) and returns the corresponding value i. If base == 0, the base is implied by the string's prefix: base 16 for "0x", base 8 for "0", and base 10 otherwise.

The bitSize argument specifies the integer type that the result must fit into. Bit sizes 0, 8, 16, 32, and 64 correspond to int, int8, int16, int32, and int64.

The errors that ParseInt returns have concrete type *NumError and include err.Num = s. If s is empty or contains invalid digits, err.Err = ErrSyntax and the returned value is 0; if the value corresponding to s cannot be represented by a signed integer of the given size, err.Err = ErrRange and the returned value is the maximum magnitude integer of the appropriate bitSize and sign.

func ParseUint

func ParseUint(s []byte, base int, bitSize int) (n uint64, err error)

ParseUint is like ParseInt but for unsigned numbers, and oeprating on []byte

Types

type NumError

type NumError struct {
	Func string // the failing function (ParseBool, ParseInt, ParseUint, ParseFloat)
	Num  string // the input
	Err  error  // the reason the conversion failed (ErrRange, ErrSyntax)
}

A NumError records a failed conversion.

func (*NumError) Error

func (e *NumError) Error() string