As you can see in the following code I cannot avoid to type the
IDs twice in the structureExchanges enum:
```d
public struct structureExchange { /// solely‐intended to help
build code at compilation‐time; for client‐code classExchanges
should be used instead
public typeLocation location;
public dstring ID;
public dstring name;
public dstring currencyID;
}
/// implementation: exchange properties are «almost» immutable;
eg: NYSE is (and will always be) on NY, USA trading in USD
/// implementation: from the app perspective (think integrity)
giving the user read‐only exchange data is a plus … ie: don't
mess with this
/// implementation: however, would it be possible to
dynamically‐load the following enums from a file at
compilation‐time ?
public immutable enum structureLocations = [
r"BUE"d : typeLocation(r"arg"d, r"Buenos Aires"d, r"ART"d),
r"GRU"d : typeLocation(r"bra"d, r"São Paulo"d, r"BRT"d),
r"HHN"d : typeLocation(r"deu"d, r"Frankfurt am Main"d,
r"CET"d),
r"LHR"d : typeLocation(r"gbr"d, r"London"d, r"UTC"d),
r"NYC"d : typeLocation(r"usa"d, r"New York"d, r"EST"d)
];
public immutable enum structureExchanges = [
r"B3"d : structureExchange(structureLocations[r"GRU"d],
r"B3"d, r"B3 formerly Bolsa de Valores de São Paulo (aka
BOVESPA)"d, r"BRL"d),
r"BCBA"d : structureExchange(structureLocations[r"BUE"d],
r"BCBA"d, r"Bolsa de Comercio de Buenos Aires"d, r"ARS"d),
r"LSE"d : structureExchange(structureLocations[r"LHR"d],
r"LSE"d, r"London Stock Exchange"d, r"GBP"d),
r"NASDAQ"d : structureExchange(structureLocations[r"NYC"d],
r"NASDAQ"d, r"National Association of Securities Dealers
Automated Quotations"d, r"USD"d),
r"NYSE"d : structureExchange(structureLocations[r"NYC"d],
r"NYSE"d, r"New York Stock Exchange"d, r"USD"d),
r"XETRA"d : structureExchange(structureLocations[r"HHN"d],
r"XETRA"d, r"Deutsche Börse"d, r"EUR"d)
]; /// byKeyValue is not available at compile‐time; hence the
redundancy of IDs
```
I attempted to use byKeyValue to get rid of the second set of IDs
to no avail; eg:
```d
static foreach(
structureExchange sudtExchange;
structureExchanges.byKeyValue
) {
... sudtExchange.key
... sudtExchange.value
}
```
