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format.conv: Add conversion from bool to String

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This commit is contained in:
Eugen Wissner 2017-07-26 06:49:33 +02:00
parent 1389b03842
commit a9cc135318
1 changed files with 24 additions and 5 deletions
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29
source/tanya/format/conv.d
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@ -13,6 +13,7 @@
module tanya.format.conv; module tanya.format.conv;
import std.traits; import std.traits;
import tanya.container.string;
import tanya.memory; import tanya.memory;
/** /**
@ -348,17 +349,22 @@ private @nogc unittest
} }
/** /**
* Converts a boolean to a number. $(D_KEYWORD true) is `1`, $(D_KEYWORD false) * Converts a boolean to $(D_PARAM To).
* is `0`. *
* If $(D_PARAM To) is a numeric type, then $(D_KEYWORD true) becomes `1`,
* $(D_KEYWORD false) `0`.
*
* If $(D_PARAM To) is a $(D_PSYMBOL String), then `"true"` or `"false"`
* is returned.
* *
* Params: * Params:
* From = Source type. * From = Source type.
* To = Target type. * To = Target type.
* from = Source value. * from = Source value.
* *
* Returns: `1` if $(D_PARAM from) is $(D_KEYWORD true), otherwise `0`. * Returns: $(D_PARAM from) converted to $(D_PARAM To).
*/ */
To to(To, From)(From from) To to(To, From)(const From from)
if (is(Unqual!From == bool) && isNumeric!To && !is(Unqual!To == Unqual!From)) if (is(Unqual!From == bool) && isNumeric!To && !is(Unqual!To == Unqual!From))
{ {
return from; return from;
@ -386,6 +392,20 @@ pure nothrow @safe @nogc unittest
assert(false.to!int == 0); assert(false.to!int == 0);
} }
/// Ditto.
To to(To, From)(const From from)
if (is(Unqual!From == bool) && is(To == String))
{
return String(from ? "true" : "false");
}
///
@nogc unittest
{
assert(true.to!String == "true");
assert(false.to!String == "false");
}
/** /**
* Converts a floating point number to an integral type. * Converts a floating point number to an integral type.
* *
@ -486,7 +506,6 @@ private @nogc unittest
* *
* Throws: $(D_PSYMBOL ConvException) if $(D_PARAM from) is not a member of * Throws: $(D_PSYMBOL ConvException) if $(D_PARAM from) is not a member of
* $(D_PSYMBOL To). * $(D_PSYMBOL To).
*/ */
To to(To, From)(From from) To to(To, From)(From from)
if (isIntegral!From && is(To == enum)) if (isIntegral!From && is(To == enum))