Add support to pretty print c-arrays

Signed-off-by: mat tso <mat-tso@topmail.ie>

include/internal/catch_tostring.h

@@ -196,10 +196,16 @@ template<class T>
 template <class C>
 typename C::const_iterator begin( const C& c ) { return c.begin(); }
 
+template <class C, size_t N>
+const C* begin( C (&array)[N] ) { return array; }
+
 /// C++11 std::cend
 template <class C>
 typename C::const_iterator end( const C& c ) { return c.end(); }
 
+template <class C, size_t N>
+const C* end( C (&array)[N] ) { return array + N; }
+
 #else
 // Importing c++11 std instead of prefixing call by std:: to allow for user
 // custom overload find through ADL
@@ -237,6 +243,12 @@ struct IsContainer {
     static const bool value = false; // By default a type is not a container
 };
 
+// C array are containers altough not having the standard api.
+template <class C, size_t N>
+struct IsContainer<C[N], false> {
+    static const bool value = true;
+};
+
 // Pre `decltype` trick to test the type of an expression
 template<class T, class U>
 struct IsSame : FalseType {};

projects/SelfTest/ToStringContainers.cpp

@@ -97,6 +97,30 @@ TEST_CASE( "list<string,allocator> -> toString", "[toString][containers][list][a
     SequenceTest<std::list, MinimalAllocator>::strings();
 }
 
+// C array
+TEST_CASE( "int [N] -> toString", "[toString][containers][c-array]" ) {
+    // Arrays of size 0 can not exist in c++
+    int oneValue[] = { 42 };
+    REQUIRE( Catch::toString(oneValue) == "{ 42 }" );
+    int twoValues[] = { 42, 250 };
+    REQUIRE( Catch::toString(twoValues) == "{ 42, 250 }" );
+}
+
+TEST_CASE( "string [N] -> toString", "[toString][containers][c-array]" ) {
+    std::string oneValue[] = { "hello" };
+    REQUIRE( Catch::toString(oneValue) == "{ \"hello\" }" );
+    std::string twoValues[] = { "hello", "world" };
+    REQUIRE( Catch::toString(twoValues) == "{ \"hello\", \"world\" }" );
+}
+
+TEST_CASE( "char [N] -> toString", "[toString][c-string]" ) {
+    // Do not consider char[] as containers but rather as c-string
+    char emptyCString[] = "";
+    REQUIRE( Catch::toString(emptyCString) == "\"\"" );
+    char cstring[] = "hello";
+    REQUIRE( Catch::toString(cstring) == "\"hello\"" );
+}
+
 #if defined(CATCH_CPP11_OR_GREATER)
 
 #ifdef __clang__