# std::money_put

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< cpp‎ | locale

Defined in header `<locale>` |  |
template< class CharT, class OutputIt = std::ostreambuf_iterator <CharT> > class money_put; |  |

Class `std::money_put` encapsulates the rules for formatting monetary values as strings. The standard I/O manipulator std::put_money uses the `std::money_put` facet of the I/O stream's locale.

Inheritance diagram

If a `std::money_put` specialization is not guaranteed to be provided by the standard library (see below), the behaviors of its put() and do_put() 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_put<char> | creates narrow string representations of monetary values
std::money_put<wchar_t> | creates wide string representations of monetary values

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

- `CharT` is one of
  - char,
  - wchar_t, and
  - any other implementation-defined character container type that meets the requirements for a character on which any of the iostream components can be instantiated; and
- `OutputIt` must meet the requirements of LegacyOutputIterator.

### Nested types

Type | Definition
`char_type` | `CharT`
`string_type` | std::basic_string <CharT>
`iter_type` | `OutputIt`

### Data members

Member | Description
std::locale::id `id` [static] | the identifier of the facet

### Member functions

(constructor) | constructs a new `money_put` facet (public member function)
put | invokes `do_put` (public member function)

### Protected member functions

(destructor) | destructs a `money_put` facet (protected member function)
do_put [virtual] | formats a monetary value and writes to output stream (virtual protected member function)

### Example

Run this code

    #include <iomanip>
    #include <iostream>
    #include <iterator>
    #include <locale>

    int main()
    {
        // using the I/O manipulator
        std::cout.imbue(std::locale("en_US.UTF-8"));
        std::cout << "American locale: "
                  << std::showbase << std::put_money(12345678.9) << '\n';

        // using the facet directly
        std::cout.imbue(std::locale("de_DE.UTF-8"));
        std::cout << "German locale: ";
        auto& f = std::use_facet<std::money_put<char>>(std::cout.getloc());
        f.put({std::cout}, false, std::cout, std::cout.fill(), 12345678.9);
        std::cout << '\n';
    }

Output:

    American locale: $123,456.79
    German locale: 123.456,79 €

### 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_put` 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_put` | can guarantee to accept implementation- defined character container types

### See also

moneypunct | defines monetary formatting parameters used by std::money_get and std::money_put (class template)
money_get | parses and constructs a monetary value from an input character sequence (class template)
put_money (C++11) | formats and outputs a monetary value (function template)

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