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  • Committer: Tarmac
  • Author(s): Rodolfo Ochoa, Paul J. Lucas
  • Date: 2012-04-20 15:35:36 UTC
  • mfrom: (10784.1.4 bug986016)
  • Revision ID: tarmac-20120420153536-020pcn5jkd3ci9ry
Work-around for Windows compiler problem; see:
http://stackoverflow.com/questions/9285657/sfinae-differentiation-between-signed-and-unsigned Approved: Rodolfo Ochoa, Paul J. Lucas

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src/util/stl_util.h
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// cases where the "signed-ness" of N1 and N2 differ such that the code is
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// warning-free.
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//
 
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// Note: the use of "!!" is to work around a compiler problem on Windows;
 
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// see: http://stackoverflow.com/questions/9285657/sfinae-differentiation-between-signed-and-unsigned
 
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//
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template<typename N1,typename N2> inline
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typename std::enable_if<ZORBA_TR1_NS::is_signed<N1>::value
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template<typename N1,typename N2> inline
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typename std::enable_if<ZORBA_TR1_NS::is_signed<N1>::value
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                     && ZORBA_TR1_NS::is_unsigned<N2>::value,bool>::type
 
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                     && !!ZORBA_TR1_NS::is_unsigned<N2>::value,bool>::type
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ge_min( N1 n1, N2 ) {
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  return n1 >= 0;
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}
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template<typename N1,typename N2> inline
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typename std::enable_if<ZORBA_TR1_NS::is_unsigned<N1>::value
 
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typename std::enable_if<!!ZORBA_TR1_NS::is_unsigned<N1>::value
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                     && ZORBA_TR1_NS::is_signed<N2>::value,bool>::type
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ge_min( N1, N2 ) {
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  return true;
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}
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template<typename N1,typename N2> inline
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typename std::enable_if<ZORBA_TR1_NS::is_unsigned<N1>::value
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                     && ZORBA_TR1_NS::is_unsigned<N2>::value,bool>::type
 
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typename std::enable_if<!!ZORBA_TR1_NS::is_unsigned<N1>::value
 
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                     && !!ZORBA_TR1_NS::is_unsigned<N2>::value,bool>::type
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ge_min( N1, N2 ) {
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  return true;
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}
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template<typename N1,typename N2> inline
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typename std::enable_if<ZORBA_TR1_NS::is_signed<N1>::value
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                     && ZORBA_TR1_NS::is_unsigned<N2>::value,bool>::type
 
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                     && !!ZORBA_TR1_NS::is_unsigned<N2>::value,bool>::type
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le_max( N1 n1, N2 ) {
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  return n1 <= 0 || static_cast<N2>( n1 ) <= std::numeric_limits<N2>::max();
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}
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template<typename N1,typename N2> inline
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typename std::enable_if<ZORBA_TR1_NS::is_unsigned<N1>::value
 
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typename std::enable_if<!!ZORBA_TR1_NS::is_unsigned<N1>::value
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                     && ZORBA_TR1_NS::is_signed<N2>::value,bool>::type
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le_max( N1 n1, N2 ) {
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  return n1 <= static_cast<N1>( std::numeric_limits<N2>::max() );
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}
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template<typename N1,typename N2> inline
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typename std::enable_if<ZORBA_TR1_NS::is_unsigned<N1>::value
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                     && ZORBA_TR1_NS::is_unsigned<N2>::value,bool>::type
 
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typename std::enable_if<!!ZORBA_TR1_NS::is_unsigned<N1>::value
 
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                     && !!ZORBA_TR1_NS::is_unsigned<N2>::value,bool>::type
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le_max( N1 n1, N2 ) {
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  return n1 <= std::numeric_limits<N2>::max();
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}