TryParseInt64 v0.1.0

Package: Format

Signature

func TryParseInt64(
    str: Slice<char8>,
    value: *var int64
) -> bool;

func TryParseInt64(
    str: String,
    value: *var int64
) -> bool;

Parameters

Returns

true when str parsed, with the value written through value; false otherwise, leaving value untouched. A null value pointer also returns false.

This is the same parse as ParseInt64 — the same accepted form and the same limits — with the outcome flattened to a bool for a caller that only wants the value and a yes-or-no, and does not need to know which ParseError a failure was.

Example

import Format::TryParseInt64;
import Io::PrintLine;

func Main() -> int {
    var n: int64 = 0;
    if TryParseInt64("100", @n) {
        PrintLine(n);           // 100
    }

    if !TryParseInt64("12x", @n) {
        PrintLine(n);           // still 100 -- left unchanged on failure
    }
    return 0;
}

See also

• Format — the package overview
• ParseInt64 — the same parse, returning a Result with the reason for a failure
• TryParseFloat64 — the floating-point counterpart