mirror of https://github.com/catchorg/Catch2.git
Added (conditional) SFINAE support.
Better streamable detection for toString using SFINAE (falls back to non-SFINAE version without)
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/*
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* Created by Phil on 15/04/2013.
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* Copyright 2013 Two Blue Cubes Ltd. All rights reserved.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef TWOBLUECUBES_CATCH_COMPILER_CAPABILITIES_HPP_INCLUDED
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#define TWOBLUECUBES_CATCH_COMPILER_CAPABILITIES_HPP_INCLUDED
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// Much of the following code is based on Boost (1.53)
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////////////////////////////////////////////////////////////////////////////////
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// Borland
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#ifdef __BORLANDC__
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#if (__BORLANDC__ > 0x582 )
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#define CATCH_SFINAE
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#endif
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#endif // __BORLANDC__
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////////////////////////////////////////////////////////////////////////////////
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// EDG
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#ifdef __EDG_VERSION__
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#if (__EDG_VERSION__ > 238 )
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#define CATCH_SFINAE
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#endif
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#endif // __EDG_VERSION__
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////////////////////////////////////////////////////////////////////////////////
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// Digital Mars
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#ifdef __DMC__
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#if (__DMC__ > 0x840 )
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#define CATCH_SFINAE
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#endif
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#endif // __DMC__
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////////////////////////////////////////////////////////////////////////////////
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// GCC
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#ifdef __GNUC__
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#if __GNUC__ < 3
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#if (__GNUC_MINOR__ >= 96 )
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#define CATCH_SFINAE
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#endif
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#elif __GNUC__ >= 3
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#define CATCH_SFINAE
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#endif // __GNUC__ < 3
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#endif // __GNUC__
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////////////////////////////////////////////////////////////////////////////////
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// Visual C++
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#ifdef _MSC_VER
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#if (_MSC_VER >= 1310 ) // (VC++ 7.0+)
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#define CATCH_SFINAE
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#endif
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#endif // _MSC_VER
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#endif // TWOBLUECUBES_CATCH_COMPILER_CAPABILITIES_HPP_INCLUDED
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@ -0,0 +1,44 @@
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/*
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* Created by Phil on 15/04/2013.
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* Copyright 2013 Two Blue Cubes Ltd. All rights reserved.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef TWOBLUECUBES_CATCH_SFINAE_HPP_INCLUDED
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#define TWOBLUECUBES_CATCH_SFINAE_HPP_INCLUDED
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// Try to detect if the current compiler supports SFINAE
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#include "catch_compiler_capabilities.h"
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#ifdef CATCH_SFINAE
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namespace Catch {
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struct TrueType {
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static const bool value = true;
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typedef void Enable;
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char sizer[1];
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};
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struct FalseType {
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static const bool value = false;
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typedef void Disable;
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char sizer[2];
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};
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template<bool> struct NotABooleanExpression;
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template<bool c> struct If : NotABooleanExpression<c> {};
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template<> struct If<true> : TrueType {};
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template<> struct If<false> : FalseType {};
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template<int size> struct SizedIf;
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template<> struct SizedIf<sizeof(TrueType)> : TrueType {};
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template<> struct SizedIf<sizeof(FalseType)> : FalseType {};
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} // end namespace Catch
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#endif // CATCH_SFINAE
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#endif // TWOBLUECUBES_CATCH_SFINAE_HPP_INCLUDED
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@ -9,6 +9,8 @@
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#define TWOBLUECUBES_CATCH_TOSTRING_HPP_INCLUDED
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#include "catch_common.h"
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#include "catch_sfinae.hpp"
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#include <sstream>
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#include <iomanip>
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#include <limits>
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#endif
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namespace Catch {
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#ifdef CATCH_SFINAE
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namespace Detail {
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template<typename T>
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class IsStreamInsertableHelper {
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template<int N> struct TrueIfSizeable : TrueType {};
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template<typename T2>
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static TrueIfSizeable<sizeof((*(std::ostream*)0) << *((T2 const*)0))> dummy(T2*);
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static FalseType dummy(...);
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public:
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typedef SizedIf<sizeof(dummy((T*)0))> type;
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};
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template<typename T>
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struct IsStreamInsertable : IsStreamInsertableHelper<T>::type {};
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template<typename T>
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void toStream( std::ostream& os, T const& value, typename IsStreamInsertable<T>::Enable* = 0 ) {
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os << value;
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}
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template<typename T>
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void toStream( std::ostream& os, T const&, typename IsStreamInsertable<T>::Disable* = 0 ) {
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os << "{?}";
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}
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}
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template<typename T>
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struct StringMaker {
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static std::string convert( T const& value ) {
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std::ostringstream oss;
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Detail::toStream( oss, value );
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return oss.str();
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}
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};
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#else
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namespace Detail {
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struct NonStreamable {
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@ -40,6 +85,10 @@ struct StringMaker {
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return oss.str();
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}
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};
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#endif
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template<typename T>
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struct StringMaker<T*> {
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static std::string convert( T const* p ) {
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@ -57,7 +106,7 @@ struct StringMaker<std::vector<T> > {
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std::ostringstream oss;
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oss << "{ ";
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for( std::size_t i = 0; i < v.size(); ++ i ) {
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oss << v[i];
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oss << toString( v[i] );
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if( i < v.size() - 1 )
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oss << ", ";
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}
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template<typename T>
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std::string toString( const T& value ) {
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return StringMaker<T>::convert( value );
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// return Detail::makeString( value );
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}
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// Built in overloads
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@ -337,14 +337,14 @@ TEST_CASE( "Assertions then sections", "" )
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}
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}
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class Awkward
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struct Awkward
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{
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operator int() const { return 7; }
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};
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//TEST_CASE( "non streamable", "" )
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//{
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// Awkward awkward;
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// std::string s = Catch::toString( awkward );
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// REQUIRE( s == "{?}" );
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//}
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TEST_CASE( "non streamable", "" )
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{
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Awkward awkward;
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std::string s = Catch::toString( awkward );
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REQUIRE( s == "7" ); // This is ambiguous without SFINAE
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}
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266ECD8C1713614B0030D735 /* catch_legacy_reporter_adapter.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = catch_legacy_reporter_adapter.hpp; sourceTree = "<group>"; };
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26759472171C72A400A84BD1 /* catch_sfinae.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = catch_sfinae.hpp; sourceTree = "<group>"; };
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26759473171C74C200A84BD1 /* catch_compiler_capabilities.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = catch_compiler_capabilities.h; sourceTree = "<group>"; };
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26847E5B16BBAB790043B9C1 /* catch_message.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = catch_message.h; sourceTree = "<group>"; };
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26847E5C16BBACB60043B9C1 /* catch_message.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = catch_message.hpp; sourceTree = "<group>"; };
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26847E5D16BBADB40043B9C1 /* catch_message.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = catch_message.cpp; path = ../../../SelfTest/SurrogateCpps/catch_message.cpp; sourceTree = "<group>"; };
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4AEE0326161431070071E950 /* catch_streambuf.h */,
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4ACE21C8166CA19700FB5509 /* catch_option.hpp */,
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2694A1F8169FFF9B004816E3 /* catch_line_wrap.h */,
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26759472171C72A400A84BD1 /* catch_sfinae.hpp */,
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26759473171C74C200A84BD1 /* catch_compiler_capabilities.h */,
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);
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name = Infrastructure;
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sourceTree = "<group>";
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