Add op+(StringRef, StringRef) -> std::string

tests/SelfTest/Baselines/compact.sw.approved.txt

@@ -1289,6 +1289,10 @@ String.tests.cpp:<line number>: passed: stdStr == "a stringref" for: "a stringre
 String.tests.cpp:<line number>: passed: stdStr.size() == sr.size() for: 11 == 11
 String.tests.cpp:<line number>: passed: stdStr == "a stringref" for: "a stringref" == "a stringref"
 String.tests.cpp:<line number>: passed: stdStr.size() == sr.size() for: 11 == 11
+String.tests.cpp:<line number>: passed: lhs == "some string += the stringref contents" for: "some string += the stringref contents"
+==
+"some string += the stringref contents"
+String.tests.cpp:<line number>: passed: together == "abrakadabra" for: "abrakadabra" == "abrakadabra"
 String.tests.cpp:<line number>: passed: with 1 message: 'empty.size() == 0'
 String.tests.cpp:<line number>: passed: with 1 message: 'empty.begin() == empty.end()'
 String.tests.cpp:<line number>: passed: with 1 message: 'stringref.size() == 3'

tests/SelfTest/Baselines/console.std.approved.txt

@@ -1381,5 +1381,5 @@ due to unexpected exception with message:
 
 ===============================================================================
 test cases:  337 |  263 passed |  70 failed |  4 failed as expected
-assertions: 1924 | 1772 passed | 131 failed | 21 failed as expected
+assertions: 1926 | 1774 passed | 131 failed | 21 failed as expected
 

tests/SelfTest/Baselines/console.sw.approved.txt

@@ -9449,6 +9449,32 @@ String.tests.cpp:<line number>: PASSED:
 with expansion:
   11 == 11
 
+-------------------------------------------------------------------------------
+StringRef
+  std::string += StringRef
+-------------------------------------------------------------------------------
+String.tests.cpp:<line number>
+...............................................................................
+
+String.tests.cpp:<line number>: PASSED:
+  REQUIRE( lhs == "some string += the stringref contents" )
+with expansion:
+  "some string += the stringref contents"
+  ==
+  "some string += the stringref contents"
+
+-------------------------------------------------------------------------------
+StringRef
+  StringRef + StringRef
+-------------------------------------------------------------------------------
+String.tests.cpp:<line number>
+...............................................................................
+
+String.tests.cpp:<line number>: PASSED:
+  REQUIRE( together == "abrakadabra" )
+with expansion:
+  "abrakadabra" == "abrakadabra"
+
 -------------------------------------------------------------------------------
 StringRef at compilation time
   Simple constructors
@@ -15033,5 +15059,5 @@ Misc.tests.cpp:<line number>: PASSED:
 
 ===============================================================================
 test cases:  337 |  247 passed |  86 failed |  4 failed as expected
-assertions: 1941 | 1772 passed | 148 failed | 21 failed as expected
+assertions: 1943 | 1774 passed | 148 failed | 21 failed as expected
 

tests/SelfTest/Baselines/junit.sw.approved.txt

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <testsuitesloose text artifact
 >
-  <testsuite name="<exe-name>" errors="17" failures="132" tests="1942" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
+  <testsuite name="<exe-name>" errors="17" failures="132" tests="1944" hostname="tbd" time="{duration}" timestamp="{iso8601-timestamp}">
     <properties>
       <property name="filters" value="~[!nonportable]~[!benchmark]~[approvals] *"/>
       <property name="random-seed" value="1"/>
@@ -1145,6 +1145,8 @@ Matchers.tests.cpp:<line number>
     <testcase classname="<exe-name>.global" name="StringRef/from std::string/assigned" time="{duration}"/>
     <testcase classname="<exe-name>.global" name="StringRef/to std::string/explicitly constructed" time="{duration}"/>
     <testcase classname="<exe-name>.global" name="StringRef/to std::string/assigned" time="{duration}"/>
+    <testcase classname="<exe-name>.global" name="StringRef/std::string += StringRef" time="{duration}"/>
+    <testcase classname="<exe-name>.global" name="StringRef/StringRef + StringRef" time="{duration}"/>
     <testcase classname="<exe-name>.global" name="StringRef at compilation time/Simple constructors" time="{duration}"/>
     <testcase classname="<exe-name>.global" name="StringRef at compilation time/UDL construction" time="{duration}"/>
     <testcase classname="<exe-name>.global" name="Stringifying std::chrono::duration helpers" time="{duration}"/>

tests/SelfTest/Baselines/sonarqube.sw.approved.txt

@@ -155,6 +155,8 @@
     <testCase name="StringRef/from std::string/assigned" duration="{duration}"/>
     <testCase name="StringRef/to std::string/explicitly constructed" duration="{duration}"/>
     <testCase name="StringRef/to std::string/assigned" duration="{duration}"/>
+    <testCase name="StringRef/std::string += StringRef" duration="{duration}"/>
+    <testCase name="StringRef/StringRef + StringRef" duration="{duration}"/>
     <testCase name="StringRef at compilation time/Simple constructors" duration="{duration}"/>
     <testCase name="StringRef at compilation time/UDL construction" duration="{duration}"/>
   </file>

tests/SelfTest/Baselines/tap.sw.approved.txt

@@ -2491,6 +2491,10 @@ ok {test-number} - stdStr.size() == sr.size() for: 11 == 11
 ok {test-number} - stdStr == "a stringref" for: "a stringref" == "a stringref"
 # StringRef
 ok {test-number} - stdStr.size() == sr.size() for: 11 == 11
+# StringRef
+ok {test-number} - lhs == "some string += the stringref contents" for: "some string += the stringref contents" == "some string += the stringref contents"
+# StringRef
+ok {test-number} - together == "abrakadabra" for: "abrakadabra" == "abrakadabra"
 # StringRef at compilation time
 ok {test-number} - with 1 message: 'empty.size() == 0'
 # StringRef at compilation time
@@ -3874,5 +3878,5 @@ ok {test-number} - q3 == 23. for: 23.0 == 23.0
 ok {test-number} -
 # xmlentitycheck
 ok {test-number} -
-1..1933
+1..1935
 

tests/SelfTest/Baselines/xml.sw.approved.txt

@@ -11724,6 +11724,30 @@ Message from section two
         </Section>
         <OverallResults successes="2" failures="0" expectedFailures="0"/>
       </Section>
+      <Section name="std::string += StringRef" filename="tests/<exe-name>/IntrospectiveTests/String.tests.cpp" >
+        <Expression success="true" type="REQUIRE" filename="tests/<exe-name>/IntrospectiveTests/String.tests.cpp" >
+          <Original>
+            lhs == "some string += the stringref contents"
+          </Original>
+          <Expanded>
+            "some string += the stringref contents"
+==
+"some string += the stringref contents"
+          </Expanded>
+        </Expression>
+        <OverallResults successes="1" failures="0" expectedFailures="0"/>
+      </Section>
+      <Section name="StringRef + StringRef" filename="tests/<exe-name>/IntrospectiveTests/String.tests.cpp" >
+        <Expression success="true" type="REQUIRE" filename="tests/<exe-name>/IntrospectiveTests/String.tests.cpp" >
+          <Original>
+            together == "abrakadabra"
+          </Original>
+          <Expanded>
+            "abrakadabra" == "abrakadabra"
+          </Expanded>
+        </Expression>
+        <OverallResults successes="1" failures="0" expectedFailures="0"/>
+      </Section>
       <OverallResult success="true"/>
     </TestCase>
     <TestCase name="StringRef at compilation time" tags="[constexpr][StringRef][Strings]" filename="tests/<exe-name>/IntrospectiveTests/String.tests.cpp" >
@@ -18031,7 +18055,7 @@ loose text artifact
       </Section>
       <OverallResult success="true"/>
     </TestCase>
-    <OverallResults successes="1772" failures="149" expectedFailures="21"/>
+    <OverallResults successes="1774" failures="149" expectedFailures="21"/>
   </Group>
-  <OverallResults successes="1772" failures="148" expectedFailures="21"/>
+  <OverallResults successes="1774" failures="148" expectedFailures="21"/>
 </Catch>