StackOverflow2013

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plurals

PO
primarykey
Id
5206221
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2011-03-05T19:27:36.590
FavoriteCount
0
LastActivityDate
2011-03-06T12:52:03.093
LastEditDate
2017-05-23T12:34:29.250
LastEditorUserId
-1
OwnerUserId
95735
ParentId
5204335
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
text
Body
I came up with my own solution (which uses the same idea Stephen Chu suggested) <pre><code>#include <iostream> #include <fstream> #include <cstdio> #include <QtCore> using namespace std; void externalLibFunction(istream & input_stream) { copy(istream_iterator<string>(input_stream), istream_iterator<string>(), ostream_iterator<string>(cout, " ")); } ifstream QFileToifstream(QFile & file) { Q_ASSERT(file.isReadable()); return ifstream(::_fdopen(file.handle(), "r")); } int main(int argc, char ** argv) { QFile file("a file"); file.open(QIODevice::WriteOnly); file.write(QString("some string").toLatin1()); file.close(); file.open(QIODevice::ReadOnly); std::ifstream ifs(QFileToifstream(file)); externalLibFunction(ifs); } </code></pre> Output: <pre><code>some string </code></pre> This code uses std::ifstream move constructor (C++x0 feature) specified in 27.9.1.7 basic_ifstream constructors section of <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf" rel="nofollow noreferrer">Working Draft, Standard for Programming Language C++</a>: <blockquote> <code>basic_ifstream(basic_ifstream&& rhs);</code> Effects: Move constructs from the rvalue rhs. This is accomplished by move constructing the base class, and the contained basic_filebuf. Next basic_istream::set_rdbuf(&sb) is called to install the contained basic_filebuf. </blockquote> See <a href="https://stackoverflow.com/questions/4825851/">How to return an fstream (C++0x)</a> for discussion on this subject.
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1. POHow to use a QFile with std::iostream?
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1. USCommunity
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1. USPiotr Dobrogost
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1. POHow to use a QFile with std::iostream?
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