WithNaN.hookOpUnary

Defines hooks for unary operators -, ~, ++, and --.

For - and ~, if v == WithNaN.defaultValue!T, returns WithNaN.defaultValue!T. Otherwise, the semantics is the same as for the built-in operator.

For ++ and --, if v == WithNaN.defaultValue!Lhs or the operation would result in an overflow, sets v to WithNaN.defaultValue!T. Otherwise, the semantics is the same as for the built-in operator.

struct WithNaN

static

auto

hookOpUnary

(

string x

)

(

ref T v

)

Parameters

x: The operator symbol
v T: The left-hand side of the comparison (T is the first argument to Checked)

Return Value

Type: auto

For x == "-" || x == "~": If v == WithNaN.defaultValue!T, the function returns WithNaN.defaultValue!T. Otherwise it returns the normal result of the operator.
For x == "++" || x == "--": The function returns void.

Examples

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

WithNaN.hookOpUnary

Parameters

Return Value

Examples

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