Use std::string_viewdevel-c++17

119 files changed, 913 insertions, 3430 deletions

diff --git a/docs/reporter-events.md b/docs/reporter-events.md
index 015f67be..a9ed40cf 100644
--- a/docs/reporter-events.md
+++ b/docs/reporter-events.md
@@ -109,10 +109,10 @@ and then `assertionEnded` event is emitted.
 > [Introduced](https://github.com/catchorg/Catch2/issues/1616) in Catch2 2.9.0.
 
 ```cpp
-void benchmarkPreparing( StringRef name ) override;
+void benchmarkPreparing( std::string_view name ) override;
 void benchmarkStarting( BenchmarkInfo const& benchmarkInfo ) override;
 void benchmarkEnded( BenchmarkStats<> const& benchmarkStats ) override;
-void benchmarkFailed( StringRef error ) override;
+void benchmarkFailed( std::string_view error ) override;
 ```
 
 Due to the benchmark lifecycle being bit more complicated, the benchmarking
@@ -153,9 +153,9 @@ void listTags( std::vector<TagInfo> const& tagInfos );
 ## Miscellaneous events
 
 ```cpp
-void reportInvalidTestSpec( StringRef unmatchedSpec );
-void fatalErrorEncountered( StringRef error );
-void noMatchingTestCases( StringRef unmatchedSpec );
+void reportInvalidTestSpec( std::string_view unmatchedSpec );
+void fatalErrorEncountered( std::string_view error );
+void noMatchingTestCases( std::string_view unmatchedSpec );
 ```
 
 These are one-off events that do not neatly fit into other categories.
diff --git a/examples/210-Evt-EventListeners.cpp b/examples/210-Evt-EventListeners.cpp
index 26d5c62c..8550e179 100644
--- a/examples/210-Evt-EventListeners.cpp
+++ b/examples/210-Evt-EventListeners.cpp
@@ -131,7 +131,7 @@ void print( std::ostream& os, int const level, std::string const& title, Catch::
 }
 
 //    struct Tag {
-//        StringRef original, lowerCased;
+//        std::string_view original, lowerCased;
 //    };
 //
 //
@@ -221,9 +221,9 @@ void print( std::ostream& os, int const level, std::string const& title, Catch::
 
 // struct AssertionInfo
 // {
-//     StringRef macroName;
+//     std::string_view macroName;
 //     SourceLineInfo lineInfo;
-//     StringRef capturedExpression;
+//     std::string_view capturedExpression;
 //     ResultDisposition::Flags resultDisposition;
 // };
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1b5a7a8b..7c29add5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -124,7 +124,6 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_stdstreams.hpp
   ${SOURCES_DIR}/internal/catch_stream_end_stop.hpp
   ${SOURCES_DIR}/internal/catch_string_manip.hpp
-  ${SOURCES_DIR}/internal/catch_stringref.hpp
   ${SOURCES_DIR}/internal/catch_tag_alias_registry.hpp
   ${SOURCES_DIR}/internal/catch_template_test_registry.hpp
   ${SOURCES_DIR}/internal/catch_test_case_info_hasher.hpp
@@ -201,7 +200,6 @@ set(IMPL_SOURCES
   ${SOURCES_DIR}/internal/catch_startup_exception_registry.cpp
   ${SOURCES_DIR}/internal/catch_stdstreams.cpp
   ${SOURCES_DIR}/internal/catch_string_manip.cpp
-  ${SOURCES_DIR}/internal/catch_stringref.cpp
   ${SOURCES_DIR}/internal/catch_tag_alias_registry.cpp
   ${SOURCES_DIR}/internal/catch_test_case_info_hasher.cpp
   ${SOURCES_DIR}/internal/catch_test_case_registry_impl.cpp
diff --git a/src/catch2/catch_all.hpp b/src/catch2/catch_all.hpp
index 4c9ea994..d948e126 100644
--- a/src/catch2/catch_all.hpp
+++ b/src/catch2/catch_all.hpp
@@ -106,7 +106,6 @@
 #include <catch2/internal/catch_stdstreams.hpp>
 #include <catch2/internal/catch_stream_end_stop.hpp>
 #include <catch2/internal/catch_string_manip.hpp>
-#include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_tag_alias_registry.hpp>
 #include <catch2/internal/catch_template_test_registry.hpp>
 #include <catch2/internal/catch_test_case_info_hasher.hpp>
diff --git a/src/catch2/catch_assertion_info.hpp b/src/catch2/catch_assertion_info.hpp
index 9d2f91fa..b64ad74b 100644
--- a/src/catch2/catch_assertion_info.hpp
+++ b/src/catch2/catch_assertion_info.hpp
@@ -10,16 +10,17 @@
 
 #include <catch2/internal/catch_result_type.hpp>
 #include <