Difference between revisions of "cpp/io/manip/get money"

Latest revision as of 22:29, 15 September 2023

When used in an expression in >> get_money(mon, intl), parses the character input as a monetary value, as specified by the std::money_get facet of the locale currently imbued in in, and stores the value in mon.

The extraction operation in in >> get_money(mon, intl) behaves as a FormattedInputFunction.

[edit] Parameters

[edit] Return value

An object of unspecified type such that

• if in is an object of type std::basic_istream<CharT, Traits>, the expression in >> get_money(mon, intl)
  • has type std::basic_istream<CharT, Traits>&
  • has value in
  • behaves as if it called f(in, mon, intl)

where the function f is defined as:

template<class CharT, class Traits, class MoneyT>
void f(std::basic_ios<CharT, Traits>& str, MoneyT& mon, bool intl)
{
    using Iter = std::istreambuf_iterator<CharT, Traits>;
    using MoneyGet = std::money_get<CharT, Iter>;
 
    std::ios_base::iostate err = std::ios_base::goodbit;
    const MoneyGet& mg = std::use_facet<MoneyGet>(str.getloc());
 
    mg.get(Iter(str.rdbuf()), Iter(), intl, str, err, mon);
 
    if (err != std::ios_base::goodbit)
        str.setstate(err);
}

[edit] Example

#include <iomanip>
#include <iostream>
#include <locale>
#include <sstream>
 
int main()
{
    std::istringstream in("$1,234.56 2.22 USD  3.33");
    long double v1, v2;
    std::string v3;
 
    in.imbue(std::locale("en_US.UTF-8"));
    in >> std::get_money(v1) >> std::get_money(v2) >> std::get_money(v3, true);
 
    if (in)
        std::cout << std::quoted(in.str()) << " parsed as: "
                  << v1 << ", " << v2 << ", " << v3 << '\n';
    else
        std::cout << "Parse failed";
}

"$1,234.56 2.22 USD  3.33" parsed as: 123456, 222, 333

[edit] See also