sprintf( FooBar, "%-10s", Foo ) in C++?
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Hi, just a quick question. Is there anyway I could do something like this in C++ with iostreams: sprintf( Foobar, "%-10s", Foo );? Yes, I know there is width( ) function, but it doesn't seem to work with negatives (if we write ,,%-10s'' instead of ,,%10s'' the string is padded from right, not from left). Any suggestions? (I don't wan't to use sprintf, because I have UTF-8 strings and it screws my display. Something like width( ), where I can enter actual length manually would be good.)
#include <iomanip>os << std::left << std::setw(10) << "foobar";Alternatively, with boost::format:
#include <boost/format.hpp>os << boost::format("%-10s") % "foobar";
there must be a better way:
... and your milage may vary.. that worked for me though :p
struct padleft{ padleft(int w): width( w){} int width;};struct padlproxy{ std::ostream &os const padleft &pad padlproxy(std::ostream &o, const padleft &p): os( o), pad( p){}};template <typename T>std::ostream& operator<<(padlproxy &pp, const T &t){ std::stringstream ss; ss << t; size_t plen = pp.pad.width - ss.str().size(); std::string pad( plen > 0 ? plen : 0, ' '); return pp.os << ss.str() << pad;}padlproxy operator<<(std::ostream &os, const padleft &pad){ return padlproxy( os, pad);}int main(void){ printf( "|%-10s|\n", "foo"); std::cout << "|" << padleft( 10) << "foo" << "|\n";}... and your milage may vary.. that worked for me though :p
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