Converting an std::vector to std::wstring
Hi: What is the best way (in terms of efficiency) to convert an std::vector of wchar_t to std::wstring. I can think of a oupple of aproaches: 1. using std::copy. 2. using boost::lexical_cast. 3 using boost::foreach 4. Usin he boost::serialization library. The std::wstring doesn't ned to be output to a file. Any advice apreciated. Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3244 (20080705) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
2008/7/6 Sean Farrow <sean.farrow@seanfarrow.co.uk>:
Hi: What is the best way (in terms of efficiency) to convert an std::vector of wchar_t to std::wstring. I can think of a oupple of aproaches: 1. using std::copy. 2. using boost::lexical_cast. 3 using boost::foreach 4. Usin he boost::serialization library.
I suspect 5. None of the above. The quickest and most efficent way to switch between two containers which contain the same type is: new_container container(old_container.begin(), old_container.end() ) so in this case: wstring my_string(v.begin(), e.end());
The std::wstring doesn't ned to be output to a file. Any advice apreciated. Sean.
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Hi: I carn't use that approach, the string is already constructed. The string is part of a structure. I could contruct a temporary string, and then assign the temporary string to the string in the structure, will this reset the length of the string in the structure? Sean. -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Chris Jefferson Sent: 07 July 2008 09:44 To: boost-users@lists.boost.org Subject: Re: [Boost-users] Converting an std::vector to std::wstring 2008/7/6 Sean Farrow <sean.farrow@seanfarrow.co.uk>:
Hi: What is the best way (in terms of efficiency) to convert an std::vector of wchar_t to std::wstring. I can think of a oupple of aproaches: 1. using std::copy. 2. using boost::lexical_cast. 3 using boost::foreach 4. Usin he boost::serialization library.
I suspect 5. None of the above. The quickest and most efficent way to switch between two containers which contain the same type is: new_container container(old_container.begin(), old_container.end() ) so in this case: wstring my_string(v.begin(), e.end());
The std::wstring doesn't ned to be output to a file. Any advice apreciated. Sean.
__________ Information from ESET NOD32 Antivirus, version of virus signature database 3244 (20080705) __________
The message was checked by ESET NOD32 Antivirus.
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users __________ Information from ESET NOD32 Antivirus, version of virus signature database 3245 (20080707) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3245 (20080707) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Sean Farrow wrote:
Hi: What is the best way (in terms of efficiency) to convert an std::vector of wchar_t to std::wstring. I can think of a oupple of aproaches: 1. using std::copy. 2. using boost::lexical_cast. 3 using boost::foreach 4. Usin he boost::serialization library. The std::wstring doesn't ned to be output to a file. Any advice apreciated. Sean.
What about the sequence assignment capabilities of basic_string itself, like this: std::wstring from_vector(const std::vector<wchar_t>& src) { return std::wstring(src.begin(), src.end()); } ? For already existing std::wstring objects you could use it's assign overload that accepts an input iterator pair. HTH & greetings from Bremen, Daniel Krügler
How does this assign overload work? Sound like wht I need. Sean. -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Daniel Krügler Sent: 07 July 2008 09:55 To: boost-users@lists.boost.org Subject: Re: [Boost-users] Converting an std::vector to std::wstring Sean Farrow wrote:
Hi: What is the best way (in terms of efficiency) to convert an std::vector of wchar_t to std::wstring. I can think of a oupple of aproaches: 1. using std::copy. 2. using boost::lexical_cast. 3 using boost::foreach 4. Usin he boost::serialization library. The std::wstring doesn't ned to be output to a file. Any advice apreciated. Sean.
What about the sequence assignment capabilities of basic_string itself, like this: std::wstring from_vector(const std::vector<wchar_t>& src) { return std::wstring(src.begin(), src.end()); } ? For already existing std::wstring objects you could use it's assign overload that accepts an input iterator pair. HTH & greetings from Bremen, Daniel Krügler _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users __________ Information from ESET NOD32 Antivirus, version of virus signature database 3245 (20080707) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3245 (20080707) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Sean Farrow wrote:
How does this assign overload work? Sound like wht I need.
Like the c'tor call, but using assign instead ;-): void from_vector(std::wstring& dst, const std::vector<wchar_t>& src) { dst.assign(src.begin(), src.end()); } This call is semantically equivalent to: dst.assign(wstring(src.begin(), src.end())); The c'tor template accepts any InputIterator with value type convertible to the value_type of the corresponding basic_string. [N.B.: If InputIterator is actually an integral type the standard requires that instead of a sequence constructor the constructor is invoked which creates astring of given size with given character value] Greetings from Bremen, Daniel Krügler
Hi: Thanks that worked. Sean. -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Daniel Krügler Sent: 07 July 2008 10:46 To: boost-users@lists.boost.org Subject: Re: [Boost-users] Converting an std::vector to std::wstring Sean Farrow wrote:
How does this assign overload work? Sound like wht I need.
Like the c'tor call, but using assign instead ;-): void from_vector(std::wstring& dst, const std::vector<wchar_t>& src) { dst.assign(src.begin(), src.end()); } This call is semantically equivalent to: dst.assign(wstring(src.begin(), src.end())); The c'tor template accepts any InputIterator with value type convertible to the value_type of the corresponding basic_string. [N.B.: If InputIterator is actually an integral type the standard requires that instead of a sequence constructor the constructor is invoked which creates astring of given size with given character value] Greetings from Bremen, Daniel Krügler _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users __________ Information from ESET NOD32 Antivirus, version of virus signature database 3245 (20080707) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3245 (20080707) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
participants (3)
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Chris Jefferson -
Daniel Krügler -
Sean Farrow