CODEWITHSUNDEEP
c++c++11fstream
Me myself and I
Me myself and I

Reputation: 4060

Working with files - replacing one line

I'm trying to overwrite the lines of a file and take out the word "hello". For some reason this isn't working. This is the file:

out.txt:

hello
1
2
goodbye

Here are the errors:

error: no matching function for call to 'std::istream_iterator<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, char, std::char_traits<char>, int>::istream_iterator(std::fstream)'|

#include <fstream>
#include <string>
#include <algorithm>
#include <iterator>

int main()
{
    std::copy_if(
        std::istream_iterator<std::string>(std::fstream("out.txt")),
        std::istream_iterator<std::string>(),
        std::istream_iterator<std::string>(std::fstream("out.txt")),
        [] (std::string str) { return str != "hello"; }
    );
}

Upvotes: 0

Views: 414

Answers (1)

awesoon
awesoon

Reputation: 33651

Look at available constructors for std::istream_iterator:

istream_iterator();
constexpr istream_iterator();
istream_iterator( istream_type& stream );
istream_iterator( const istream_iterator& other ) = default;

You're trying to call third constructor, but you pass a rvalue, while a lvalie is expected.

Upvotes: 4

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