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c++ how to read each entry in text file while ignoring spaces?

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Hi in c++ I remember there was some file library where you could read each variable in a text file where spaces seperated the entries. eg the text file: 0 abc 453 hello 4 5 3 and if each entry were to be in an array it would look like so: 0 abc 453 hello 4 5 3 I've done this before, but I cannot remember what I used for this. Any idea? Thanks

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#include <fstream>
#include <string>
#include <vector>

std::ifstream file( "filename.txt" );

std::vector< std::string > words;
while ( file.good() ) {
std::string word;
file >> word;
words.push_back( word );

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