| .. Algorithms/Transformation Algorithms//replace |40 |
| |
| replace |
| ======= |
| |
| Synopsis |
| -------- |
| |
| .. parsed-literal:: |
| |
| template< |
| typename Sequence |
| , typename OldType |
| , typename NewType |
| , typename In = |unspecified| |
| > |
| struct replace |
| { |
| typedef |unspecified| type; |
| }; |
| |
| |
| |
| Description |
| ----------- |
| |
| Returns a copy of the original sequence where every type identical to ``OldType`` |
| has been replaced with ``NewType``. |
| |
| |transformation algorithm disclaimer| |
| |
| Header |
| ------ |
| |
| .. parsed-literal:: |
| |
| #include <boost/mpl/replace.hpp> |
| |
| |
| Model of |
| -------- |
| |
| |Reversible Algorithm| |
| |
| |
| Parameters |
| ---------- |
| |
| +---------------+-----------------------------------+-------------------------------+ |
| | Parameter | Requirement | Description | |
| +===============+===================================+===============================+ |
| | ``Sequence`` | |Forward Sequence| | A original sequence. | |
| +---------------+-----------------------------------+-------------------------------+ |
| | ``OldType`` | Any type | A type to be replaced. | |
| +---------------+-----------------------------------+-------------------------------+ |
| | ``NewType`` | Any type | A type to replace with. | |
| +---------------+-----------------------------------+-------------------------------+ |
| | ``In`` | |Inserter| | An inserter. | |
| +---------------+-----------------------------------+-------------------------------+ |
| |
| |
| Expression semantics |
| -------------------- |
| |
| |Semantics disclaimer...| |Reversible Algorithm|. |
| |
| For any |Forward Sequence| ``s``, an |Inserter| ``in``, and arbitrary types ``x`` and ``y``: |
| |
| |
| .. parsed-literal:: |
| |
| typedef replace<s,x,y,in>::type r; |
| |
| :Return type: |
| A type. |
| |
| :Semantics: |
| Equivalent to |
| |
| .. parsed-literal:: |
| |
| typedef replace_if< s,y,is_same<_,x>,in >::type r; |
| |
| |
| Complexity |
| ---------- |
| |
| Linear. Performs exactly ``size<s>::value`` comparisons for |
| identity / insertions. |
| |
| |
| Example |
| ------- |
| |
| .. parsed-literal:: |
| |
| typedef vector<int,float,char,float,float,double> types; |
| typedef vector<int,double,char,double,double,double> expected; |
| typedef replace< types,float,double >::type result; |
| |
| BOOST_MPL_ASSERT(( equal< result,expected > )); |
| |
| |
| See also |
| -------- |
| |
| |Transformation Algorithms|, |Reversible Algorithm|, |reverse_replace|, |replace_if|, |remove|, |transform| |
| |
| |
| .. 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) |