Planet
navi homePPSaboutscreenshotsdownloaddevelopmentforum

source: downloads/boost_1_34_1/libs/mpl/doc/src/refmanual/replace.rst @ 29

Last change on this file since 29 was 29, checked in by landauf, 17 years ago

updated boost from 1_33_1 to 1_34_1
File size: 2.5 KB

replace

Synopsis

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|

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:

typedef replace<s,x,y,in>::type r;
Return type:

A type.
Semantics:

Equivalent to

typedef replace_if< s,y,is_same<_,x>,in >::type r;

Complexity

Linear. Performs exactly size<s>::value comparisons for identity / insertions.

Example

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 > ));

Docutils System Messages

????????????????
Note: See TracBrowser for help on using the repository browser.