Modern Finance IsValid

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IsValid

Returns false if the Currency is Invalid; the only reliable test for a bad value.

Syntax

IsValid( ) as boolean

Notes

• The only correct test. An Invalid value never compares equal to anything, itself included -- the same rule the chrono types follow, and for the same reason: an equality that succeeded would let bad values through validation.
• Worth checking after a parse and after any arithmetic that could overflow.
• A default-constructed Currency is zero, and valid.

Examples

#import "std/money"
using money

dim as Currency c = CurrencyFromInt( 10 )
print c.IsValid( )           '' true

dim as Currency zero_
print zero_.IsValid( )       '' true -- default-constructed is 0, not Invalid

print CurrencyInvalid( ).IsValid( )           '' false

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Library: Finance
Category: Finance
Documented under: Members