Support C arrays and ADL ranges in from_range generator

Closes #2737

2 files changed, 34 insertions, 4 deletions

diff --git a/src/catch2/generators/catch_generators_range.hpp b/src/catch2/generators/catch_generators_range.hpp
index 495acb95..b67c1590 100644
--- a/src/catch2/generators/catch_generators_range.hpp
+++ b/src/catch2/generators/catch_generators_range.hpp
@@ -96,10 +96,11 @@ GeneratorWrapper<ResultType> from_range(InputIterator from, InputSentinel to) {
     return GeneratorWrapper<ResultType>(Catch::Detail::make_unique<IteratorGenerator<ResultType>>(from, to));
 }
 
-template <typename Container,
-          typename ResultType = typename Container::value_type>
-GeneratorWrapper<ResultType> from_range(Container const& cnt) {
-    return GeneratorWrapper<ResultType>(Catch::Detail::make_unique<IteratorGenerator<ResultType>>(cnt.begin(), cnt.end()));
+template <typename Container>
+auto from_range(Container const& cnt) {
+    using std::begin;
+    using std::end;
+    return from_range( begin( cnt ), end( cnt ) );
 }
 
 
diff --git a/tests/SelfTest/IntrospectiveTests/GeneratorsImpl.tests.cpp b/tests/SelfTest/IntrospectiveTests/GeneratorsImpl.tests.cpp
index f7b7c57c..acfeebed 100644
--- a/tests/SelfTest/IntrospectiveTests/GeneratorsImpl.tests.cpp
+++ b/tests/SelfTest/IntrospectiveTests/GeneratorsImpl.tests.cpp
@@ -10,6 +10,8 @@
 #    pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
 
+#include <helpers/range_test_helpers.hpp>
+
 #include <catch2/catch_approx.hpp>
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/generators/catch_generator_exception.hpp>
@@ -545,3 +547,30 @@ TEST_CASE("Filter generator throws exception for empty generator",
         filter( []( int ) { return false; }, value( 3 ) ),
         Catch::GeneratorException );
 }
+
+TEST_CASE("from_range(container) supports ADL begin/end and arrays", "[generators][from-range][approvals]") {
+    using namespace Catch::Generators;
+
+    SECTION("C array") {
+        int arr[3]{ 5, 6, 7 };
+        auto gen = from_range( arr );
+        REQUIRE( gen.get() == 5 );
+        REQUIRE( gen.next() );
+        REQUIRE( gen.get() == 6 );
+        REQUIRE( gen.next() );
+        REQUIRE( gen.get() == 7 );
+        REQUIRE_FALSE( gen.next() );
+    }
+
+    SECTION( "ADL range" ) {
+        unrelated::needs_ADL_begin<int> range{ 1, 2, 3 };
+        auto gen = from_range( range );
+        REQUIRE( gen.get() == 1 );
+        REQUIRE( gen.next() );
+        REQUIRE( gen.get() == 2 );
+        REQUIRE( gen.next() );
+        REQUIRE( gen.get() == 3 );
+        REQUIRE_FALSE( gen.next() );
+    }
+
+}