Menu
Search

API Documentation

version 2.109.1

overview

View source code
Display the source code in std/checkedint.d from which this page was generated on github.
Report a bug
If you spot a problem with this page, click here to create a Bugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Function std.checkedint.Checked.opEquals

Compares this against rhs for equality.

bool opEquals(U, _) (
  U rhs
)
if (isIntegral!U || isFloatingPoint!U || is(U == bool) || is(U == Checked!(V, W), V, W) && is(typeof(this == rhs.payload)));

If U is also an instance of Checked, both hooks (left- and right-hand side) are introspected for the method hookOpEquals. If both define it, priority is given to the left-hand side.

Parameters

NameDescription
rhs Right-hand side to compare for equality

Returns

If Hook defines hookOpEquals, the function forwards to hook.hookOpEquals(get, rhs). Otherwise, the result of the built-in operation get == rhs is returned.

Example

import std.traits : isUnsigned;

static struct MyHook
{
    static bool thereWereErrors;
    static bool hookOpEquals(L, R)(L lhs, R rhs)
    {
        if (lhs != rhs) return false;
        static if (isUnsigned!L && !isUnsigned!R)
        {
            if (lhs > 0 && rhs < 0) thereWereErrors = true;
        }
        else static if (isUnsigned!R && !isUnsigned!L)
            if (lhs < 0 && rhs > 0) thereWereErrors = true;
        // Preserve built-in behavior.
        return true;
    }
}
auto a = checked!MyHook(-42);
writeln(a); // uint(-42)
assert(MyHook.thereWereErrors);
MyHook.thereWereErrors = false;
writeln(checked!MyHook(uint(-42))); // -42
assert(MyHook.thereWereErrors);
static struct MyHook2
{
    static bool hookOpEquals(L, R)(L lhs, R rhs)
    {
        return lhs == rhs;
    }
}
MyHook.thereWereErrors = false;
writeln(checked!MyHook2(uint(-42))); // a
// Hook on left hand side takes precedence, so no errors
assert(!MyHook.thereWereErrors);

Authors

License