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version 2.102.0

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Function std.checkedint.WithNaN.hookOpBinary

Defines hooks for binary operators +, -, *, /, %, ^^, &, |, ^, <<, >>, and >>> for cases where a Checked object is the left-hand side operand. If lhs == WithNaN.defaultValue!Lhs, returns WithNaN.defaultValue!(typeof(lhs + rhs)) without evaluating the operand. Otherwise, evaluates the operand. If evaluation does not overflow, returns the result. Otherwise, returns WithNaN.defaultValue!(typeof(lhs + rhs)).

auto hookOpBinary(string x, L, R) (
  L lhs,
  R rhs
);

Parameters

NameDescription
x The operator symbol
lhs The left-hand side operand (Lhs is the first argument to Checked)
rhs The right-hand side operand

Returns

If lhs != WithNaN.defaultValue!Lhs and the operator does not overflow, the function returns the same result as the built-in operator. In all other cases, returns WithNaN.defaultValue!(typeof(lhs + rhs)).

Example

Checked!(int, WithNaN) x;
assert((x + 1).isNaN);
x = 100;
assert(!(x + 1).isNaN);

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