Re: [boost] boost::decimal::money - comments on Martin's money classes

From: Martin (adrianm_at_[hidden])
Date: 2005-06-20 18:12:22

> As far as I can see, the second item in the BOOST_MONEY_OPERATOR macro is
> incorrect.  Consider:
> 
> 	money m = 2;
> 	5 - money(2);
> 
> This would result in:
> 
> 	money(2) -= 5;
> 

You are right of course. The macro was only a quick fix for a VC70 bug. Other 
compilers should use the operators library where the left subtraction is 
disabled.

I'm in the process of reworking the library. The focus has changed from 
decimal arithmetic into money and currency.

The current library got basic_money and basic_currency classes based on a 
money_traits class which handles the adaptation for the underlying arithmetic 
class.

template <typename ArithmeticT, typename TraitsT = money_traits<ArithmeticT> >
class basic_money;
template <typename MoneyT, typename CurrencyT = currency_type>
class basic_currency;

typedef basic_money<decimalF64> mymoney;
mymoney m(5.25, decimals(2), round_to_nearest);

const currency_type EUR("EUR"), USD("USD");
typedef basic_currency<basic_money<decimal64> > mycurrency;
mycurrency c(1.23, digits(3), EUR), d(1.23, "USD");