| .. Metafunctions/Arithmetic Operations//minus |20 |
| |
| minus |
| ===== |
| |
| Synopsis |
| -------- |
| |
| .. parsed-literal:: |
| |
| template< |
| typename T1 |
| , typename T2 |
| , typename T3 = |unspecified| |
| |...| |
| , typename T\ *n* = |unspecified| |
| > |
| struct minus |
| { |
| typedef |unspecified| type; |
| }; |
| |
| |
| |
| Description |
| ----------- |
| |
| Returns the difference of its arguments. |
| |
| |
| Header |
| ------ |
| |
| .. parsed-literal:: |
| |
| #include <boost/mpl/minus.hpp> |
| #include <boost/mpl/arithmetic.hpp> |
| |
| |
| Model of |
| -------- |
| |
| |Numeric Metafunction| |
| |
| |
| Parameters |
| ---------- |
| |
| +---------------+---------------------------+-----------------------------------------------+ |
| | Parameter | Requirement | Description | |
| +===============+===========================+===============================================+ |
| | |T1...Tn| | |Integral Constant| | Operation's arguments. | |
| +---------------+---------------------------+-----------------------------------------------+ |
| |
| |Note:| |numeric metafunction note| |-- end note| |
| |
| |
| Expression semantics |
| -------------------- |
| |
| For any |Integral Constant|\ s |c1...cn|: |
| |
| |
| .. parsed-literal:: |
| |
| typedef minus<c1,\ |...|\ c\ *n*\>::type r; |
| |
| :Return type: |
| |Integral Constant|. |
| |
| :Semantics: |
| Equivalent to |
| |
| .. parsed-literal:: |
| |
| typedef integral_c< |
| typeof(c1::value - c2::value) |
| , ( c1::value - c2::value ) |
| > c; |
| |
| typedef minus<c,c3,\ |...|\c\ *n*\>::type r; |
| |
| .. .......................................................................... |
| |
| .. parsed-literal:: |
| |
| typedef minus<c1,\ |...|\ c\ *n*\> r; |
| |
| :Return type: |
| |Integral Constant|. |
| |
| :Semantics: |
| Equivalent to |
| |
| .. parsed-literal:: |
| |
| struct r : minus<c1,\ |...|\ c\ *n*\>::type {}; |
| |
| |
| Complexity |
| ---------- |
| |
| Amortized constant time. |
| |
| |
| Example |
| ------- |
| |
| .. parsed-literal:: |
| |
| typedef minus< int_<-10>, int_<3>, long_<1> >::type r; |
| BOOST_MPL_ASSERT_RELATION( r::value, ==, -14 ); |
| BOOST_MPL_ASSERT(( is_same< r::value_type, long > )); |
| |
| |
| See also |
| -------- |
| |
| |Arithmetic Operations|, |Numeric Metafunction|, |numeric_cast|, |plus|, |negate|, |times| |
| |
| |
| .. copyright:: Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
