catch2/include/internal/catch_tostring.hpp

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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_HPP_INCLUDED
#define TWOBLUECUBES_CATCH_TOSTRING_HPP_INCLUDED
#include "catch_common.h"
#include "catch_sfinae.hpp"
#include <sstream>
#include <iomanip>
#include <limits>
#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();
}
};
} // end namespace Detail
template<typename T>
struct StringMaker :
Detail::StringMakerBase<Detail::IsStreamInsertable<T>::value> {};
template<typename T>
struct StringMaker<T*> {
static std::string convert( T const* p ) {
if( !p )
return INTERNAL_CATCH_STRINGIFY( NULL );
std::ostringstream oss;
oss << p;
return oss.str();
}
};
template<typename T>
struct StringMaker<std::vector<T> > {
static std::string convert( std::vector<T> const& v ) {
std::ostringstream oss;
oss << "{ ";
for( std::size_t i = 0; i < v.size(); ++ i ) {
oss << toString( v[i] );
if( i < v.size() - 1 )
oss << ", ";
}
oss << " }";
return oss.str();
}
};
namespace Detail {
template<typename T>
inline 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
inline std::string toString( std::string const& value ) {
return "\"" + value + "\"";
}
inline std::string toString( std::wstring const& value ) {
std::ostringstream oss;
oss << "\"";
for(size_t i = 0; i < value.size(); ++i )
oss << static_cast<char>( value[i] <= 0xff ? value[i] : '?');
oss << "\"";
return oss.str();
}
inline std::string toString( const char* const value ) {
return value ? Catch::toString( std::string( value ) ) : std::string( "{null string}" );
}
inline std::string toString( char* const value ) {
return Catch::toString( static_cast<const char*>( value ) );
}
inline std::string toString( int value ) {
std::ostringstream oss;
oss << value;
return oss.str();
}
inline std::string toString( unsigned long value ) {
std::ostringstream oss;
if( value > 8192 )
oss << "0x" << std::hex << value;
else
oss << value;
return oss.str();
}
inline std::string toString( unsigned int value ) {
return toString( static_cast<unsigned long>( value ) );
}
inline std::string toString( const double value ) {
std::ostringstream oss;
oss << std::setprecision (std::numeric_limits<double>::digits10 + 1)
<< value;
return oss.str();
}
inline std::string toString( bool value ) {
return value ? "true" : "false";
}
inline std::string toString( char value ) {
return value < ' '
? toString( static_cast<unsigned int>( value ) )
: Detail::makeString( value );
}
inline std::string toString( signed char value ) {
return toString( static_cast<char>( value ) );
}
inline std::string toString( unsigned char value ) {
return toString( static_cast<char>( value ) );
}
#ifdef CATCH_CONFIG_CPP11_NULLPTR
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inline std::string toString( std::nullptr_t ) {
return "nullptr";
}
#endif
#ifdef __OBJC__
inline std::string toString( NSString const * const& nsstring ) {
if( !nsstring )
return "nil";
return std::string( "@\"" ) + [nsstring UTF8String] + "\"";
}
inline std::string toString( NSString * CATCH_ARC_STRONG const& nsstring ) {
if( !nsstring )
return "nil";
return std::string( "@\"" ) + [nsstring UTF8String] + "\"";
}
inline std::string toString( NSObject* const& nsObject ) {
return toString( [nsObject description] );
}
#endif
} // end namespace Catch
#endif // TWOBLUECUBES_CATCH_TOSTRING_HPP_INCLUDED