catch2/include/internal/catch_tostring.h

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/*
* Created by Phil on 8/5/2012.
* Copyright 2012 Two Blue Cubes Ltd. All rights reserved.
*
* Distributed under the Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*/
#ifndef TWOBLUECUBES_CATCH_TOSTRING_H_INCLUDED
#define TWOBLUECUBES_CATCH_TOSTRING_H_INCLUDED
#include "catch_common.h"
#include "catch_sfinae.hpp"
#include <sstream>
#include <iomanip>
#include <limits>
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#include <vector>
#include <cstddef>
#ifdef __OBJC__
#include "catch_objc_arc.hpp"
#endif
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namespace Catch {
namespace Detail {
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// SFINAE is currently disabled by default for all compilers.
// If the non SFINAE version of IsStreamInsertable is ambiguous for you
// and your compiler supports SFINAE, try #defining CATCH_CONFIG_SFINAE
#ifdef CATCH_CONFIG_SFINAE
template<typename T>
class IsStreamInsertableHelper {
template<int N> struct TrueIfSizeable : TrueType {};
template<typename T2>
static TrueIfSizeable<sizeof((*(std::ostream*)0) << *((T2 const*)0))> dummy(T2*);
static FalseType dummy(...);
public:
typedef SizedIf<sizeof(dummy((T*)0))> type;
};
template<typename T>
struct IsStreamInsertable : IsStreamInsertableHelper<T>::type {};
#else
struct BorgType {
template<typename T> BorgType( T const& );
};
TrueType& testStreamable( std::ostream& );
FalseType testStreamable( FalseType );
FalseType operator<<( std::ostream const&, BorgType const& );
template<typename T>
struct IsStreamInsertable {
static std::ostream &s;
static T const&t;
enum { value = sizeof( testStreamable(s << t) ) == sizeof( TrueType ) };
};
#endif
template<bool C>
struct StringMakerBase {
template<typename T>
static std::string convert( T const& ) { return "{?}"; }
};
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template<>
struct StringMakerBase<true> {
template<typename T>
static std::string convert( T const& _value ) {
std::ostringstream oss;
oss << _value;
return oss.str();
}
};
struct Endianness {
enum Arch { Big, Little };
static Arch which() {
union _{
int asInt;
char asChar[sizeof (int)];
} u;
u.asInt = 1;
return ( u.asChar[sizeof(int)-1] == 1 ) ? Big : Little;
}
};
// Writes the raw memory into a string, considering endianness
template<typename T>
std::string rawMemoryToString( T value ) {
union _ {
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T typedValue;
unsigned char bytes[sizeof(T)];
} u;
u.typedValue = value;
std::ostringstream oss;
oss << "0x";
int i = 0, end = sizeof(T), inc = 1;
if( Endianness::which() == Endianness::Little ) {
i = end-1;
end = inc = -1;
}
for( ; i != end; i += inc )
oss << std::hex << std::setw(2) << std::setfill('0') << (unsigned int)u.bytes[i];
return oss.str();
}
} // end namespace Detail
template<typename T>
std::string toString( T const& value );
template<typename T>
struct StringMaker :
Detail::StringMakerBase<Detail::IsStreamInsertable<T>::value> {};
template<typename T>
struct StringMaker<T*> {
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template<typename U>
static std::string convert( U* p ) {
if( !p )
return INTERNAL_CATCH_STRINGIFY( NULL );
else
return Detail::rawMemoryToString( p );
}
};
template<typename R, typename C>
struct StringMaker<R C::*> {
static std::string convert( R C::* p ) {
if( !p )
return INTERNAL_CATCH_STRINGIFY( NULL );
else
return Detail::rawMemoryToString( p );
}
};
namespace Detail {
template<typename InputIterator>
std::string rangeToString( InputIterator first, InputIterator last );
}
template<typename T, typename Allocator>
struct StringMaker<std::vector<T, Allocator> > {
static std::string convert( std::vector<T,Allocator> const& v ) {
return Detail::rangeToString( v.begin(), v.end() );
}
};
namespace Detail {
template<typename T>
std::string makeString( T const& value ) {
return StringMaker<T>::convert( value );
}
} // end namespace Detail
/// \brief converts any type to a string
///
/// The default template forwards on to ostringstream - except when an
/// ostringstream overload does not exist - in which case it attempts to detect
/// that and writes {?}.
/// Overload (not specialise) this template for custom typs that you don't want
/// to provide an ostream overload for.
template<typename T>
std::string toString( T const& value ) {
return StringMaker<T>::convert( value );
}
// Built in overloads
std::string toString( std::string const& value );
std::string toString( std::wstring const& value );
std::string toString( const char* const value );
std::string toString( char* const value );
std::string toString( int value );
std::string toString( unsigned long value );
std::string toString( unsigned int value );
std::string toString( const double value );
std::string toString( bool value );
std::string toString( char value );
std::string toString( signed char value );
std::string toString( unsigned char value );
#ifdef CATCH_CONFIG_CPP11_NULLPTR
std::string toString( std::nullptr_t );
#endif
#ifdef __OBJC__
std::string toString( NSString const * const& nsstring );
std::string toString( NSString * CATCH_ARC_STRONG const& nsstring );
std::string toString( NSObject* const& nsObject );
#endif
namespace Detail {
template<typename InputIterator>
std::string rangeToString( InputIterator first, InputIterator last ) {
std::ostringstream oss;
oss << "{ ";
if( first != last ) {
oss << toString( *first );
for( ++first ; first != last ; ++first ) {
oss << ", " << toString( *first );
}
}
oss << " }";
return oss.str();
}
}
} // end namespace Catch
#endif // TWOBLUECUBES_CATCH_TOSTRING_H_INCLUDED