std::money_get

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< cpp‎ | locale
 
C++
 
Localization library
 
std::money_get
 
Defined in header <locale>
template<

    class CharT,
    class InputIt = std::istreambuf_iterator<CharT>

> class money_get;

Class template std::money_get encapsulates the rules for parsing monetary values from character streams. The standard I/O manipulator std::get_money uses the std::money_get facet of the I/O stream's locale.

cpp/locale/locale/facetstd-money get-inheritance.svg

Inheritance diagram

If a std::money_get specialization is not guaranteed to be provided by the standard library (see below), the behaviors of its get() and do_get() are not guaranteed as specified.

Specializations

The standard library is guaranteed to provide the following specializations (they are required to be implemented by any locale object):

Defined in header <locale>
std::money_get<char> parses narrow string representations of monetary values
std::money_get<wchar_t> parses wide string representations of monetary values

In addition, the standard library is also guaranteed to provide every specialization that satisfies the following type requirements:

Member types

Member type Definition
char_type CharT
string_type std::basic_string<CharT>
iter_type InputIt

Member functions

 constructs a new money_get facet
(public member function)
invokes do_get
(public member function)

Protected member functions

 destructs a money_get facet
(protected member function)
[virtual]
 parses a monetary value from an input stream
(virtual protected member function)

Member objects

static std::locale::id id
 id of the locale
(public member object)

Example

Run this code
#include <iomanip>
#include <iostream>
#include <iterator>
#include <locale>
#include <sstream>
 
int main()
{
    std::string str = "$1.11 $2.22 $3.33";
    std::cout << std::fixed << std::setprecision(2);
 
    std::cout << '\"' << str << "\" parsed with the I/O manipulator: ";
    std::istringstream s1(str);
    s1.imbue(std::locale("en_US.UTF-8"));
 
    long double val;
    while (s1 >> std::get_money(val))
        std::cout << val / 100 << ' ';
    std::cout << '\n';
 
    str = "USD  1,234.56";
    std::cout << '\"' << str << "\" parsed with the facet directly: ";
    std::istringstream s2(str);
    s2.imbue(std::locale("en_US.UTF-8"));
 
    auto& f = std::use_facet<std::money_get<char>>(s2.getloc());
    std::ios_base::iostate err;
    std::istreambuf_iterator<char> beg(s2), end;
    f.get(beg, end, true, s2, err, val);
 
    std::cout << val / 100 << '\n';
}

Output: 

"$1.11 $2.22 $3.33" parsed with the I/O manipulator: 1.11 2.22 3.33
"USD  1,234.56" parsed with the facet directly: 1234.56

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 427 C++98 money_get was guaranteed to accept any CharT that
meets the requirements for a character on which
any of the iostream components can be instantiated 		only guarantees to accept char,
wchar_t and other implementation-
defined character types
LWG 2392 C++98 only character type CharT could be
guaranteed to be accepted by money_get 		can guarantee to accept implementation-
defined character container types

See also

 defines monetary formatting parameters used by std::money_get and std::money_put
(class template)
formats a monetary value for output as a character sequence
(class template)
(C++11)
 parses a monetary value
(function template)
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