[Boost-users] boost::iostreams : equivalent of std::getline() in boost
vandamme
Hello !
I want to use boost to read a text file like this :
boost::iostreams::file_source file(filename.c_str());
But, when I want to get each single line with getline(), it doesn't compile
:
while (std::getline(file, line)) { ...} // COMPILATION ERROR
What's the equivalent in boost for std::getline() ?
Thks.
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Steven Watanabe
vandamme wrote:
> I want to use boost to read a text file like this :
>
> boost::iostreams::file_source file(filename.c_str());
>
> But, when I want to get each single line with getline(), it doesn't compile
> :
>
> while (std::getline(file, line)) { ...} // COMPILATION ERROR
>
> What's the equivalent in boost for std::getline() ?
>
You can use boost::iostreams::stream.
#include <boost/iostreams/device/file.hpp>
#include <boost/iostreams/stream.hpp>
#include <istream>
int main() {
std::string filename("test");
boost::iostreams::stream<boost::iostreams::file_source>
file(filename.c_str());
std::string line;
while (std::getline(file, line)) { }
}
In Christ,
Steven Watanabe
vandamme
Thanks for your answer.
Still, I have a strange behavior :
When the file doesn't exist, file.is_open() still return true !!!
When I use 'ifstream file' instead of
'boost::iostreams::stream<boost::iostreams::file_source> file',
the test 'if (file)' is always wrong when the file doesn't exist.
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