pretty-print

Is there no standard way to print out values for end-user consumption? Show is clearly more of a debugging convenience than something that would work for this purpose, given the conventions around its use and the constraint that read (show x) == x . For example, isn't there at least a simple package like class (Show a) => PShow a where pshow :: a -> String pshow = show pprint :: (PShow a) => a -> IO () pprint = putStrLn . pshow where instances do something like instance PShow MyType where pshow a = someUserFriendlyStringOf a Note that I'm not asking for something that provides elaborate pretty

I did a transformation from few XML formats to one standard. My XSL looks like following one: <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"> <xsl:output method="xml" encoding="UTF-8" indent="yes" omit-xml-declaration="yes"/> <xsl:template match="list | store"> <list> <xsl:for-each select="item | product | product-store"> <item> <name> <xsl:choose> <xsl:when test="name"><xsl:value-of select="substring-before(name, ' ')" /></xsl:when> <xsl:otherwise><xsl:value-of select="name | title" /></xsl:otherwise> </xsl:choose> </name>

I have the following code to pretty-print generic vectors -: // print a vector template<typename T1> std::ostream& operator <<( std::ostream& out, const std::vector<T1>& object ) { out << "["; if ( !object.empty() ) { std::copy( object.begin(), --object.end(), std::ostream_iterator<T1>( out, ", " ) ); out << *--object.end(); // print the last element separately to avoid the extra characters following it. } out << "]"; return out; } I am getting a compiler error if I try to print a nested vector from it. int main() { vector<vector<int> > a; vector<int> b; // cout << b ; // Works fine for this