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## Class template wrapping_int

boost::date_time::wrapping_int — A wrapping integer used to support time durations (WARNING: only instantiate with a signed type).

## Synopsis

    template<typename int_type_, int_type_ wrap_val>
    class wrapping_int {
    public:
      // types
      typedef int_type_ int_type;

      // construct/copy/destruct
      wrapping_int(int_type);

      // public member functions
      int_type as_int() const;
      operator int_type() const;
      int_type add(int_type) ;
      int_type subtract(int_type) ;

      // public static functions
      static int_type wrap_value() ;

      // private member functions
      int_type calculate_wrap(int_type) ;
    };

## Description

In composite date and time types this type is used to wrap at the day boundary. Ex: A wrapping_int<short, 10> will roll over after nine, and roll under below zero. This gives a range of [0,9]

NOTE: it is strongly recommended that wrapping_int2 be used instead of wrapping_int as wrapping_int is to be depricated at some point soon.

Also Note that warnings will occur if instantiated with an unsigned type. Only a signed type should be used!

### `wrapping_int` construct/copy/destruct

1.     wrapping_int(int_type v);

### `wrapping_int` public member functions

1.     int_type as_int() const;

2.     operator int_type() const;

3.     int_type add(int_type v) ;

   The sign of the returned value will indicate which direction the wraps went. Ex: add a negative number and wrapping under could occur, this would be indicated by a negative return value. If wrapping over took place, a positive value would be returned

4.     int_type subtract(int_type v) ;

   The sign of the returned value will indicate which direction the wraps went (positive indicates wrap under, negative indicates wrap over). Ex: subtract a negative number and wrapping over could occur, this would be indicated by a negative return value. If wrapping under took place, a positive value would be returned.

### `wrapping_int` public static functions

1.     static int_type wrap_value() ;

### `wrapping_int` private member functions

1.     int_type calculate_wrap(int_type wrap) ;

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