| Topic: |
DEVELOP > c-Plus-Plus |
| User: |
"Andrew Wingorodov" |
| Date: |
27 Dec 2007 04:59:53 AM |
| Object: |
remove spaces from begin a string |
im made subj like this:
inline
bool isnt_space (int sp) { return (::isspace (sp)) ? false : true; }
str.erase (
std.begin ()
, std::find_if ( str.begin(), str.end(), isnt_space)
);
How i can use std for better away?
Can i invert result of the ::isspace by means of bind2nd?
--
www.andr.mobi
.
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| User: "Daniel T." |
|
| Title: Re: remove spaces from begin a string |
27 Dec 2007 11:02:06 AM |
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Andrew Wingorodov <mail@andr.ca> wrote:
im made subj like this:
inline
bool isnt_space (int sp) { return (::isspace (sp)) ? false : true; }
The above could have been written more compactly as:
inline bool isnt_space( int sp ) { return !::isspace( sp ); }
str.erase (
std.begin ()
, std::find_if ( str.begin(), str.end(), isnt_space)
);
How i can use std for better away?
Can i invert result of the ::isspace by means of bind2nd?
Try this:
str.erase( str.begin(), find_if( str.begin(), str.end(),
not1( ptr_fun( &::isspace ) ) ) );
ptr_fun turns the function into an adaptable unary function
(http://www.sgi.com/tech/stl/AdaptableUnaryFunction.html)
not1 creates a unary_negate object, which inverts the result of the
function passed to it.
(http://www.sgi.com/tech/stl/unary_negate.html)
There may be a question as to whether what I provided is a "better way"
than what you did.
Of course you could always do both...
const unary_negate<pointer_to_unary_function<int, int> >
isnt_space = not1( ptr_fun( &::isspace ) );
str.erase( str.begin(),
find_if( str.begin(), str.end(), isnt_space ) );
.
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| User: "Andrew Wingorodov" |
|
| Title: Re: remove spaces from begin a string |
28 Dec 2007 01:55:16 AM |
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Daniel T. <daniel_t@earthlink.net> wrote:
bool isnt_space (int sp) { return (::isspace (sp)) ? false : true; }
inline bool isnt_space( int sp ) { return !::isspace( sp ); }
OK
Try this:
str.erase( str.begin(), find_if( str.begin(), str.end(),
not1( ptr_fun( &::isspace ) ) ) );
str.erase( str.begin(),
find_if( str.begin(), str.end(), isnt_space ) );
10x
--
www.andr.mobi
.
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| User: "Jim Langston" |
|
| Title: Re: remove spaces from begin a string |
28 Dec 2007 10:17:37 AM |
|
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Andrew Wingorodov wrote:
im made subj like this:
inline
bool isnt_space (int sp) { return (::isspace (sp)) ? false : true; }
str.erase (
std.begin ()
, std::find_if ( str.begin(), str.end(), isnt_space)
);
How i can use std for better away?
Can i invert result of the ::isspace by means of bind2nd?
This is what I use to trim spaces from the beginning and end of a
std::string:
std::string trim( const std::string& text, const char TrimChar = ' ' );
std::string trim( const std::string& text, const char TrimChar )
{
std::string::size_type First = text.find_first_not_of(TrimChar);
if ( First == std::string::npos )
return "";
return text.substr( First, text.find_last_not_of(TrimChar) - First +
1);
}
This will remove the trim char (defaults to space, but you can make it
anything) from the beginning and end of a string.
--
Jim Langston
tazmaster@rocketmail.com
.
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| User: "Daniel T." |
|
| Title: Re: remove spaces from begin a string |
28 Dec 2007 12:40:16 PM |
|
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"Jim Langston" <tazmaster@rocketmail.com> wrote:
Andrew Wingorodov wrote:
inline
bool isnt_space (int sp) { return (::isspace (sp)) ? false : true; }
str.erase (
std.begin ()
, std::find_if ( str.begin(), str.end(), isnt_space)
);
How i can use std for better away?
Can i invert result of the ::isspace by means of bind2nd?
This is what I use to trim spaces from the beginning and end of a
std::string:
std::string trim( const std::string& text, const char TrimChar = ' ' );
std::string trim( const std::string& text, const char TrimChar )
{
std::string::size_type First = text.find_first_not_of(TrimChar);
if ( First == std::string::npos )
return "";
return text.substr( First, text.find_last_not_of(TrimChar) - First +
1);
}
This will remove the trim char (defaults to space, but you can make it
anything) from the beginning and end of a string.
Note, isspace returns true for 6 different characters...
.
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| User: "Pavel Shved" |
|
| Title: Re: remove spaces from begin a string |
27 Dec 2007 05:29:08 AM |
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On 27 =C4=C5=CB, 13:59, Andrew Wingorodov <m...@andr.ca> wrote:
im made subj like this:
inline
bool isnt_space (int sp) { return (::isspace (sp)) ? false : true; }
str.erase (
=9A =9A =9A =9A =9A std.begin ()
=9A =9A =9A =9A , std::find_if ( str.begin(), str.end(), isnt_space)
);
How i can use std for better away?
You can read manual on STL. Check something like `not1' (thats a
`one' which means `negate unary predicate').
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