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150 lines
3.9 KiB
C++
150 lines
3.9 KiB
C++
// (C) 2003, Fernando Luis Cacciola Carballal.
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//
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// This material is provided "as is", with absolutely no warranty expressed
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// or implied. Any use is at your own risk.
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//
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// Permission to use or copy this software for any purpose is hereby granted
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// without fee, provided the above notices are retained on all copies.
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// Permission to modify the code and to distribute modified code is granted,
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// provided the above notices are retained, and a notice that the code was
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// modified is included with the above copyright notice.
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//
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//
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// NOTE: This file is intended to be used ONLY by the test files
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// from the Numeric Conversions Library
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//
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//
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#include "boost/compatibility/cpp_c_headers/cmath"
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#include "boost/limits.hpp"
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#include "boost/utility.hpp"
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#include "boost/test/included/test_exec_monitor.hpp"
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// Convenience macros to help with compilers which don't parse
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// explicit template function instantiations (MSVC6)
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#define MATCH_FNTPL_ARG(t) t const*
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#define SET_FNTPL_ARG(t) (static_cast< t const* >(0))
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//
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// *Minimal* example of a User Defined Numeric Type
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//
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//
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namespace MyUDT
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{
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template<class T>
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struct UDT
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{
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typedef T builtin_type ;
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UDT ( T v_ ) : v (v_) {}
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T to_builtin() const { return v ; }
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friend bool operator == ( UDT const& lhs, UDT const& rhs )
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{ return lhs.to_builtin() == rhs.to_builtin() ; }
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// NOTE: This operator is *required* by the Numeric Conversion Library
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// if Turnc<> is used as the Float2IntRounder policy.
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friend bool operator < ( UDT const& lhs, UDT const& rhs )
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{ return lhs.to_builtin() < rhs.to_builtin() ; }
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friend std::ostream& operator << ( std::ostream& os, UDT const& n )
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{ return os << n.to_builtin() ; }
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T v ;
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} ;
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typedef UDT<int> MyInt ;
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typedef UDT<double> MyFloat ;
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//
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// The Float2IntRounder policies *require* a visible 'ceil' or 'floor' math function
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// with standard semantics.
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// In a conformant compiler, ADL can pick these functions even if they are defined
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// within a user namespace, as below.
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//
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inline MyInt ceil ( MyInt const& x ) { return x ; }
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inline MyInt floor ( MyInt const& x ) { return x ; }
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inline MyFloat floor ( MyFloat const& x )
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{
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return MyFloat ( std::floor(x.to_builtin()) ) ;
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}
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inline MyFloat ceil ( MyFloat const& x )
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{
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return MyFloat ( std::ceil(x.to_builtin()) ) ;
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}
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} // namespace MyUDT
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//
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// The Numeric Conversion Library *requires* User Defined Numeric Types
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// to properly specialize std::numeric_limits<>
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//
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namespace std
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{
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template<>
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class numeric_limits<MyUDT::MyInt> : public numeric_limits<int>
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{
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public :
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BOOST_STATIC_CONSTANT(bool, is_specialized = false);
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} ;
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template<>
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class numeric_limits<MyUDT::MyFloat> : public numeric_limits<double>
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{
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public :
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BOOST_STATIC_CONSTANT(bool, is_specialized = false);
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} ;
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} // namespace std
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//
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// The functions floor and ceil defined within namespace MyUDT
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// should be found by koenig loopkup, but some compilers don't do it right
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// so we inyect them into namespace std so ordinary overload resolution
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// can found them.
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#if defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP) || defined(__BORLANDC__) || defined(__GNUC__)
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namespace std {
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using MyUDT::floor ;
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using MyUDT::ceil ;
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} // namespace std
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#endif
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std::string to_string( bool arg )
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{
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return arg ? "true" : "false" ;
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}
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std::string to_string( ... ) { throw std::runtime_error("to_string() called with wrong type!") ; }
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//
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// This is used to print 'char' values as numbers instead of characters.
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//
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template<class T> struct printable_number_type { typedef T type ; } ;
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template<> struct printable_number_type<signed char> { typedef int type ; } ;
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template<> struct printable_number_type<unsigned char> { typedef unsigned type ; } ;
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template<> struct printable_number_type<char> { typedef int type ; } ;
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template<class T>
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inline
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typename printable_number_type<T>::type
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printable( T n ) { return n ; }
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//
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///////////////////////////////////////////////////////////////////////////////////////////////
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