to

Converts from to a boolean.

If From is a numeric type, then 1 becomes $(D_KEYWORD true), 0 $(D_KEYWORD false). Otherwise $(D_PSYMBOL ConvException) is thrown.

If To is a string (built-in string or $(D_PSYMBOL String)), then "true" or "false" are converted to the appropriate boolean value. Otherwise $(D_PSYMBOL ConvException) is thrown.

template to(To)
To to(From from)
To to(From from)
To to(From from)
To to(From from)
To to(From from)
To
to
(
To
From
)
(
auto ref const From from
)
if (
(
is(From == String) ||
isSomeString!From
) &&
is(Unqual!To == bool)
)
To to(From from)
To to(From from)

Parameters

From: Source type.
To: Target type.
from From: Source value.

Return Value

Type: To

$(D_KEYWORD from) converted to a boolean.

Throws

$(D_PSYMBOL ConvException) if from isn't convertible.

Examples

assert(!0.0.to!bool);
assert(0.2.to!bool);
assert(0.5.to!bool);
assert(1.0.to!bool);

assert(!0.to!bool);
assert(1.to!bool);

assert("true".to!bool);
assert(!"false".to!bool);
assert(String("true").to!bool);
assert(!String("false").to!bool);

to

Parameters

Return Value

Throws

Examples

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