Enum support (fix for Issue #121) (#429)

Printable enum support Co-authored-by: Joshua Kriegshauser <[email protected]>
doctest · Nov 4, 2020 · 961a542 · 961a542
1 parent 301a104
commit 961a542
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Showing 9 changed files with 495 additions and 12 deletions.
diff --git a/doctest/doctest.h b/doctest/doctest.h
@@ -387,6 +387,9 @@ DOCTEST_GCC_SUPPRESS_WARNING_POP
 #endif // DOCTEST_CONFIG_USE_IOSFWD
 
 #ifdef DOCTEST_CONFIG_USE_STD_HEADERS
+#ifndef DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
+#define DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
+#endif // DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
 #include <iosfwd>
 #include <cstddef>
 #include <ostream>
@@ -752,15 +755,13 @@ struct ContextOptions //!OCLINT too many fields
 };
 
 namespace detail {
-#if defined(DOCTEST_CONFIG_TREAT_CHAR_STAR_AS_STRING) || defined(DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS)
     template <bool CONDITION, typename TYPE = void>
     struct enable_if
     {};
 
     template <typename TYPE>
     struct enable_if<true, TYPE>
     { typedef TYPE type; };
-#endif // DOCTEST_CONFIG_TREAT_CHAR_STAR_AS_STRING) || DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
 
     // clang-format off
     template<class T> struct remove_reference      { typedef T type; };
@@ -769,6 +770,14 @@ namespace detail {
 
     template<class T> struct remove_const          { typedef T type; };
     template<class T> struct remove_const<const T> { typedef T type; };
+#ifdef DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
+    template<class T> struct is_enum : public std::is_enum<T> {};
+    template<class T> struct underlying_type : public std::underlying_type<T> {};
+#else
+    // Use compiler intrinsics
+    template<class T> struct is_enum { constexpr static bool value = __is_enum(T); };
+    template<class T> struct underlying_type { typedef __underlying_type(T) type; };
+#endif
     // clang-format on
 
     template <typename T>
@@ -783,12 +792,12 @@ namespace detail {
 
         template<class, class = void>
         struct check {
-            static constexpr auto value = false;
+            static constexpr bool value = false;
         };
 
         template<class T>
         struct check<T, decltype(os() << val<T>(), void())> {
-            static constexpr auto value = true;
+            static constexpr bool value = true;
         };
     } // namespace has_insertion_operator_impl
 
@@ -857,7 +866,7 @@ struct StringMaker<R C::*>
     }
 };
 
-template <typename T>
+template <typename T, typename detail::enable_if<!detail::is_enum<T>::value, bool>::type = true>
 String toString(const DOCTEST_REF_WRAP(T) value) {
     return StringMaker<T>::convert(value);
 }
@@ -884,6 +893,12 @@ DOCTEST_INTERFACE String toString(int long long in);
 DOCTEST_INTERFACE String toString(int long long unsigned in);
 DOCTEST_INTERFACE String toString(std::nullptr_t in);
 
+template <typename T, typename detail::enable_if<detail::is_enum<T>::value, bool>::type = true>
+String toString(const DOCTEST_REF_WRAP(T) value) {
+    typedef typename detail::underlying_type<T>::type UT;
+    return toString(static_cast<UT>(value));
+}
+
 #if DOCTEST_MSVC >= DOCTEST_COMPILER(19, 20, 0)
 // see this issue on why this is needed: https://github.com/onqtam/doctest/issues/183
 DOCTEST_INTERFACE String toString(const std::string& in);

diff --git a/doctest/parts/doctest_fwd.h b/doctest/parts/doctest_fwd.h
@@ -388,6 +388,9 @@ DOCTEST_GCC_SUPPRESS_WARNING_POP
 #endif // DOCTEST_CONFIG_USE_IOSFWD
 
 #ifdef DOCTEST_CONFIG_USE_STD_HEADERS
+#ifndef DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
+#define DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
+#endif // DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
 #include <iosfwd>
 #include <cstddef>
 #include <ostream>
@@ -753,15 +756,13 @@ struct ContextOptions //!OCLINT too many fields
 };
 
 namespace detail {
-#if defined(DOCTEST_CONFIG_TREAT_CHAR_STAR_AS_STRING) || defined(DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS)
     template <bool CONDITION, typename TYPE = void>
     struct enable_if
     {};
 
     template <typename TYPE>
     struct enable_if<true, TYPE>
     { typedef TYPE type; };
-#endif // DOCTEST_CONFIG_TREAT_CHAR_STAR_AS_STRING) || DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
 
     // clang-format off
     template<class T> struct remove_reference      { typedef T type; };
@@ -770,6 +771,14 @@ namespace detail {
 
     template<class T> struct remove_const          { typedef T type; };
     template<class T> struct remove_const<const T> { typedef T type; };
+#ifdef DOCTEST_CONFIG_INCLUDE_TYPE_TRAITS
+    template<class T> struct is_enum : public std::is_enum<T> {};
+    template<class T> struct underlying_type : public std::underlying_type<T> {};
+#else
+    // Use compiler intrinsics
+    template<class T> struct is_enum { constexpr static bool value = __is_enum(T); };
+    template<class T> struct underlying_type { typedef __underlying_type(T) type; };
+#endif
     // clang-format on
 
     template <typename T>
@@ -784,12 +793,12 @@ namespace detail {
 
         template<class, class = void>
         struct check {
-            static constexpr auto value = false;
+            static constexpr bool value = false;
         };
 
         template<class T>
         struct check<T, decltype(os() << val<T>(), void())> {
-            static constexpr auto value = true;
+            static constexpr bool value = true;
         };
     } // namespace has_insertion_operator_impl
 
@@ -858,7 +867,7 @@ struct StringMaker<R C::*>
     }
 };
 
-template <typename T>
+template <typename T, typename detail::enable_if<!detail::is_enum<T>::value, bool>::type = true>
 String toString(const DOCTEST_REF_WRAP(T) value) {
     return StringMaker<T>::convert(value);
 }
@@ -885,6 +894,12 @@ DOCTEST_INTERFACE String toString(int long long in);
 DOCTEST_INTERFACE String toString(int long long unsigned in);
 DOCTEST_INTERFACE String toString(std::nullptr_t in);
 
+template <typename T, typename detail::enable_if<detail::is_enum<T>::value, bool>::type = true>
+String toString(const DOCTEST_REF_WRAP(T) value) {
+    typedef typename detail::underlying_type<T>::type UT;
+    return toString(static_cast<UT>(value));
+}
+
 #if DOCTEST_MSVC >= DOCTEST_COMPILER(19, 20, 0)
 // see this issue on why this is needed: https://github.com/onqtam/doctest/issues/183
 DOCTEST_INTERFACE String toString(const std::string& in);

diff --git a/examples/all_features/CMakeLists.txt b/examples/all_features/CMakeLists.txt
@@ -15,6 +15,7 @@ set(files_with_output
     templated_test_cases.cpp
     test_cases_and_suites.cpp
     asserts_used_outside_of_tests.cpp
+    enums.cpp
 )
 
 set(files_all

diff --git a/examples/all_features/enums.cpp b/examples/all_features/enums.cpp
@@ -0,0 +1,109 @@
+#include <doctest/doctest.h>
+
+#include "header.h"
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace
+{
+
+enum StandardEnum
+{
+    Zero,
+    One,
+    Two,
+};
+
+enum TypedEnum : int64_t
+{
+    TypedZero,
+    TypedOne,
+    TypedTwo,
+};
+
+enum class EnumClassC : char
+{
+    Zero = '0',
+    One = '1',
+    Two = '2',
+};
+
+enum class EnumClassSC : signed char
+{
+    Zero = '0',
+    One = '1',
+    Two = '2',
+};
+
+enum class EnumClassUC : unsigned char
+{
+    Zero = '0',
+    One = '1',
+    Two = '2',
+};
+
+enum class EnumClassU8 : uint8_t
+{
+    Zero,
+    One,
+    Two,
+};
+
+template<class E, class T = typename std::underlying_type<E>::type>
+T printable(E val)
+{
+    return T(val);
+}
+
+}
+
+TEST_CASE("enum 1")
+{
+    std::ostringstream ostr;
+    ostr << Zero << One << Two;
+    ostr << TypedZero << TypedOne << TypedTwo;
+    static_assert(std::is_enum<EnumClassSC>::value, "");
+    ostr << printable(EnumClassSC::Zero) << printable(EnumClassSC::One) << printable(EnumClassSC::Two);
+
+    CHECK_EQ(Zero, 0);
+    CHECK_EQ(One, 1);
+    CHECK_EQ(Two, 2);
+
+    CHECK_EQ(TypedZero, 0);
+    CHECK_EQ(TypedOne, 1);
+    CHECK_EQ(TypedTwo, 2);
+
+    CHECK_EQ(EnumClassSC::Zero, EnumClassSC::Zero);
+    CHECK_EQ(EnumClassSC::One, EnumClassSC::One);
+    CHECK_EQ(EnumClassSC::Two, EnumClassSC::Two);
+}
+
+TEST_CASE("enum 2" * doctest::should_fail())
+{
+    CHECK_EQ(Zero, 1);
+    CHECK_EQ(One, 2);
+    CHECK_EQ(Two, 3);
+
+    CHECK_EQ(TypedZero, 1);
+    CHECK_EQ(TypedOne, 2);
+    CHECK_EQ(TypedTwo, 3);
+
+    CHECK_EQ(EnumClassC::Zero, EnumClassC::One);
+    CHECK_EQ(EnumClassC::One, EnumClassC::Two);
+    CHECK_EQ(EnumClassC::Two, EnumClassC::Zero);
+
+    CHECK_EQ(EnumClassSC::Zero, EnumClassSC::One);
+    CHECK_EQ(EnumClassSC::One, EnumClassSC::Two);
+    CHECK_EQ(EnumClassSC::Two, EnumClassSC::Zero);
+
+    CHECK_EQ(EnumClassUC::Zero, EnumClassUC::One);
+    CHECK_EQ(EnumClassUC::One, EnumClassUC::Two);
+    CHECK_EQ(EnumClassUC::Two, EnumClassUC::Zero);
+
+    CHECK_EQ(EnumClassU8::Zero, EnumClassU8::One);
+    CHECK_EQ(EnumClassU8::One, EnumClassU8::Two);
+    CHECK_EQ(EnumClassU8::Two, EnumClassU8::Zero);
+}
diff --git a/examples/all_features/test_output/enums.cpp.txt b/examples/all_features/test_output/enums.cpp.txt
@@ -0,0 +1,65 @@
+[doctest] run with "--help" for options
+===============================================================================
+enums.cpp(0):
+TEST CASE:  enum 2
+
+enums.cpp(0): ERROR: CHECK_EQ( Zero, 1 ) is NOT correct!
+  values: CHECK_EQ( 0, 1 )
+
+enums.cpp(0): ERROR: CHECK_EQ( One, 2 ) is NOT correct!
+  values: CHECK_EQ( 1, 2 )
+
+enums.cpp(0): ERROR: CHECK_EQ( Two, 3 ) is NOT correct!
+  values: CHECK_EQ( 2, 3 )
+
+enums.cpp(0): ERROR: CHECK_EQ( TypedZero, 1 ) is NOT correct!
+  values: CHECK_EQ( 0, 1 )
+
+enums.cpp(0): ERROR: CHECK_EQ( TypedOne, 2 ) is NOT correct!
+  values: CHECK_EQ( 1, 2 )
+
+enums.cpp(0): ERROR: CHECK_EQ( TypedTwo, 3 ) is NOT correct!
+  values: CHECK_EQ( 2, 3 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassC::Zero, EnumClassC::One ) is NOT correct!
+  values: CHECK_EQ( 48, 49 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassC::One, EnumClassC::Two ) is NOT correct!
+  values: CHECK_EQ( 49, 50 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassC::Two, EnumClassC::Zero ) is NOT correct!
+  values: CHECK_EQ( 50, 48 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassSC::Zero, EnumClassSC::One ) is NOT correct!
+  values: CHECK_EQ( 48, 49 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassSC::One, EnumClassSC::Two ) is NOT correct!
+  values: CHECK_EQ( 49, 50 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassSC::Two, EnumClassSC::Zero ) is NOT correct!
+  values: CHECK_EQ( 50, 48 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassUC::Zero, EnumClassUC::One ) is NOT correct!
+  values: CHECK_EQ( 48, 49 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassUC::One, EnumClassUC::Two ) is NOT correct!
+  values: CHECK_EQ( 49, 50 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassUC::Two, EnumClassUC::Zero ) is NOT correct!
+  values: CHECK_EQ( 50, 48 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassU8::Zero, EnumClassU8::One ) is NOT correct!
+  values: CHECK_EQ( 0, 1 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassU8::One, EnumClassU8::Two ) is NOT correct!
+  values: CHECK_EQ( 1, 2 )
+
+enums.cpp(0): ERROR: CHECK_EQ( EnumClassU8::Two, EnumClassU8::Zero ) is NOT correct!
+  values: CHECK_EQ( 2, 0 )
+
+Failed as expected so marking it as not failed
+===============================================================================
+[doctest] test cases:  2 | 2 passed |  0 failed |
+[doctest] assertions: 27 | 9 passed | 18 failed |
+[doctest] Status: SUCCESS!
+Program code.