[Boost-users] Converting an std::vector to std::wstring
Sean Farrow
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.
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Chris Jefferson
> 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());
Sean Farrow
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.
new_container container(old_container.begin(), old_container.end() )
so in this case:
wstring my_string(v.begin(), e.end());
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Daniel Krügler
> 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
Sean Farrow
Sound like wht I need.
Sean.
-----Original Message-----
From: boost-use...@lists.boost.org [mailto:boost-use...@lists.boost.org] On Behalf Of Daniel Krügler
Sent: 07 July 2008 09:55
To: boost...@lists.boost.org
Subject: Re: [Boost-users] Converting an std::vector to std::wstring
?
Daniel Krügler
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Daniel Krügler
> 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,
Sean Farrow
Thanks that worked.
Sean.
-----Original Message-----
From: boost-use...@lists.boost.org [mailto:boost-use...@lists.boost.org] On Behalf Of Daniel Krügler
Sent: 07 July 2008 10:46
To: boost...@lists.boost.org
Subject: Re: [Boost-users] Converting an std::vector to std::wstring
dst.assign(wstring(src.begin(), src.end()));
Greetings from Bremen,
Daniel Krügler
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