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Define specialization of PrintTo(...) for ::std::tuple.

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This commit is contained in:
kosak
2014-01-12 19:59:41 +00:00
parent d3eb97f321
commit ccf8e33bc5
3 changed files with 227 additions and 67 deletions
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122
include/gtest/gtest-printers.h
View File

@@ -103,6 +103,10 @@
#include "gtest/internal/gtest-port.h"
#include "gtest/internal/gtest-internal.h"
#if GTEST_HAS_STD_TUPLE_
# include <tuple>
#endif
namespace testing {
// Definitions in the 'internal' and 'internal2' name spaces are
@@ -480,14 +484,16 @@ inline void PrintTo(const ::std::wstring& s, ::std::ostream* os) {
}
#endif // GTEST_HAS_STD_WSTRING
#if GTEST_HAS_TR1_TUPLE
// Overload for ::std::tr1::tuple. Needed for printing function arguments,
// which are packed as tuples.
#if GTEST_HAS_TR1_TUPLE || GTEST_HAS_STD_TUPLE_
// Helper function for printing a tuple. T must be instantiated with
// a tuple type.
template <typename T>
void PrintTupleTo(const T& t, ::std::ostream* os);
#endif // GTEST_HAS_TR1_TUPLE || GTEST_HAS_STD_TUPLE_
#if GTEST_HAS_TR1_TUPLE
// Overload for ::std::tr1::tuple. Needed for printing function arguments,
// which are packed as tuples.
// Overloaded PrintTo() for tuples of various arities. We support
// tuples of up-to 10 fields. The following implementation works
@@ -561,6 +567,13 @@ void PrintTo(
}
#endif // GTEST_HAS_TR1_TUPLE
#if GTEST_HAS_STD_TUPLE_
template <typename... Types>
void PrintTo(const ::std::tuple<Types...>& t, ::std::ostream* os) {
PrintTupleTo(t, os);
}
#endif // GTEST_HAS_STD_TUPLE_
// Overload for std::pair.
template <typename T1, typename T2>
void PrintTo(const ::std::pair<T1, T2>& value, ::std::ostream* os) {
@@ -756,16 +769,65 @@ void UniversalPrint(const T& value, ::std::ostream* os) {
UniversalPrinter<T1>::Print(value, os);
}
#if GTEST_HAS_TR1_TUPLE
typedef ::std::vector<string> Strings;
// TuplePolicy<TupleT> must provide:
// - tuple_size
// size of tuple TupleT.
// - get<size_t I>(const TupleT& t)
// static function extracting element I of tuple TupleT.
// - tuple_element<size_t I>::type
// type of element I of tuple TupleT.
template <typename TupleT>
struct TuplePolicy;
#if GTEST_HAS_TR1_TUPLE
template <typename TupleT>
struct TuplePolicy {
typedef TupleT Tuple;
static const size_t tuple_size = ::std::tr1::tuple_size<Tuple>::value;
template <size_t I>
struct tuple_element : ::std::tr1::tuple_element<I, Tuple> {};
template <size_t I>
static typename AddReference<
const typename ::std::tr1::tuple_element<I, Tuple>::type>::type get(
const Tuple& tuple) {
return ::std::tr1::get<I>(tuple);
}
};
template <typename TupleT>
const size_t TuplePolicy<TupleT>::tuple_size;
#endif // GTEST_HAS_TR1_TUPLE
#if GTEST_HAS_STD_TUPLE_
template <typename... Types>
struct TuplePolicy< ::std::tuple<Types...> > {
typedef ::std::tuple<Types...> Tuple;
static const size_t tuple_size = ::std::tuple_size<Tuple>::value;
template <size_t I>
struct tuple_element : ::std::tuple_element<I, Tuple> {};
template <size_t I>
static const typename ::std::tuple_element<I, Tuple>::type& get(
const Tuple& tuple) {
return ::std::get<I>(tuple);
}
};
template <typename... Types>
const size_t TuplePolicy< ::std::tuple<Types...> >::tuple_size;
#endif // GTEST_HAS_STD_TUPLE_
#if GTEST_HAS_TR1_TUPLE || GTEST_HAS_STD_TUPLE_
// This helper template allows PrintTo() for tuples and
// UniversalTersePrintTupleFieldsToStrings() to be defined by
// induction on the number of tuple fields. The idea is that
// TuplePrefixPrinter<N>::PrintPrefixTo(t, os) prints the first N
// fields in tuple t, and can be defined in terms of
// TuplePrefixPrinter<N - 1>.
//
// The inductive case.
template <size_t N>
struct TuplePrefixPrinter {
@@ -773,9 +835,12 @@ struct TuplePrefixPrinter {
template <typename Tuple>
static void PrintPrefixTo(const Tuple& t, ::std::ostream* os) {
TuplePrefixPrinter<N - 1>::PrintPrefixTo(t, os);
*os << ", ";
UniversalPrinter<typename ::std::tr1::tuple_element<N - 1, Tuple>::type>
::Print(::std::tr1::get<N - 1>(t), os);
if (N > 1) {
*os << ", ";
}
UniversalPrinter<
typename TuplePolicy<Tuple>::template tuple_element<N - 1>::type>
::Print(TuplePolicy<Tuple>::template get<N - 1>(t), os);
}
// Tersely prints the first N fields of a tuple to a string vector,
@@ -784,12 +849,12 @@ struct TuplePrefixPrinter {
static void TersePrintPrefixToStrings(const Tuple& t, Strings* strings) {
TuplePrefixPrinter<N - 1>::TersePrintPrefixToStrings(t, strings);
::std::stringstream ss;
UniversalTersePrint(::std::tr1::get<N - 1>(t), &ss);
UniversalTersePrint(TuplePolicy<Tuple>::template get<N - 1>(t), &ss);
strings->push_back(ss.str());
}
};
// Base cases.
// Base case.
template <>
struct TuplePrefixPrinter<0> {
template <typename Tuple>
@@ -798,34 +863,13 @@ struct TuplePrefixPrinter<0> {
template <typename Tuple>
static void TersePrintPrefixToStrings(const Tuple&, Strings*) {}
};
// We have to specialize the entire TuplePrefixPrinter<> class
// template here, even though the definition of
// TersePrintPrefixToStrings() is the same as the generic version, as
// Embarcadero (formerly CodeGear, formerly Borland) C++ doesn't
// support specializing a method template of a class template.
template <>
struct TuplePrefixPrinter<1> {
template <typename Tuple>
static void PrintPrefixTo(const Tuple& t, ::std::ostream* os) {
UniversalPrinter<typename ::std::tr1::tuple_element<0, Tuple>::type>::
Print(::std::tr1::get<0>(t), os);
}
template <typename Tuple>
static void TersePrintPrefixToStrings(const Tuple& t, Strings* strings) {
::std::stringstream ss;
UniversalTersePrint(::std::tr1::get<0>(t), &ss);
strings->push_back(ss.str());
}
};
// Helper function for printing a tuple. T must be instantiated with
// a tuple type.
template <typename T>
void PrintTupleTo(const T& t, ::std::ostream* os) {
// Helper function for printing a tuple.
// Tuple must be either std::tr1::tuple or std::tuple type.
template <typename Tuple>
void PrintTupleTo(const Tuple& t, ::std::ostream* os) {
*os << "(";
TuplePrefixPrinter< ::std::tr1::tuple_size<T>::value>::
PrintPrefixTo(t, os);
TuplePrefixPrinter<TuplePolicy<Tuple>::tuple_size>::PrintPrefixTo(t, os);
*os << ")";
}
@@ -835,11 +879,11 @@ void PrintTupleTo(const T& t, ::std::ostream* os) {
template <typename Tuple>
Strings UniversalTersePrintTupleFieldsToStrings(const Tuple& value) {
Strings result;
TuplePrefixPrinter< ::std::tr1::tuple_size<Tuple>::value>::
TuplePrefixPrinter<TuplePolicy<Tuple>::tuple_size>::
TersePrintPrefixToStrings(value, &result);
return result;
}
#endif // GTEST_HAS_TR1_TUPLE
#endif // GTEST_HAS_TR1_TUPLE || GTEST_HAS_STD_TUPLE_
} // namespace internal

24
include/gtest/internal/gtest-port.h
View File

@@ -343,6 +343,30 @@
# define GTEST_HAS_STD_INITIALIZER_LIST_ 1
#endif
// C++11 specifies that <tuple> provides std::tuple.
// Some platforms still might not have it, however.
#if GTEST_LANG_CXX11
# define GTEST_HAS_STD_TUPLE_ 1
# if defined(__clang__)
// Inspired by http://clang.llvm.org/docs/LanguageExtensions.html#__has_include
# if defined(__has_include) && !__has_include(<tuple>)
# undef GTEST_HAS_STD_TUPLE_
# endif
# elif defined(_MSC_VER)
// Inspired by boost/config/stdlib/dinkumware.hpp
# if defined(_CPPLIB_VER) && _CPPLIB_VER < 520
# undef GTEST_HAS_STD_TUPLE_
# endif
# elif defined(__GLIBCXX__)
// Inspired by boost/config/stdlib/libstdcpp3.hpp,
// http://gcc.gnu.org/gcc-4.2/changes.html and
// http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt01ch01.html#manual.intro.status.standard.200x
# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)
# undef GTEST_HAS_STD_TUPLE_
# endif
# endif
#endif
// Brings in definitions for functions used in the testing::internal::posix
// namespace (read, write, close, chdir, isatty, stat). We do not currently
// use them on Windows Mobile.