Make PrintTo functions static inline in perf_tests.cpp for better encapsulation. Add missing <ostream> include.

Author: allnes

modules/core/performance/tests/perf_tests.cpp

@@ -5,6 +5,7 @@
 #include <filesystem>
 #include <fstream>
 #include <memory>
+#include <ostream>
 #include <stdexcept>
 #include <string_view>
 #include <vector>
@@ -96,12 +97,11 @@ TEST(perf_tests, check_perf_task_float) {
 struct ParamTestCase {
   ppc::core::PerfResults::TypeOfRunning input;
   std::string expected_output;
+  friend inline void PrintTo(const ParamTestCase& param, std::ostream* os) {
+    *os << "{ input = " << static_cast<int>(param.input) << ", expected = " << param.expected_output << " }";
+  }
 };
 
-inline void PrintTo(const ParamTestCase& param, std::ostream* os) {
-  *os << "{ input = " << static_cast<int>(param.input) << ", expected = " << param.expected_output << " }";
-}
-
 class GetStringParamNameParamTest : public ::testing::TestWithParam<ParamTestCase> {};
 
 TEST_P(GetStringParamNameParamTest, ReturnsExpectedString) {
@@ -120,13 +120,12 @@ struct TaskTypeTestCase {
   ppc::core::TypeOfTask type;
   std::string expected;
   std::string label;
+  friend inline void PrintTo(const TaskTypeTestCase& param, std::ostream* os) {
+    *os << "{ type = " << static_cast<int>(param.type) << ", expected = " << param.expected
+        << ", label = " << param.label << " }";
+  }
 };
 
-inline void PrintTo(const TaskTypeTestCase& param, std::ostream* os) {
-  *os << "{ type = " << static_cast<int>(param.type) << ", expected = " << param.expected << ", label = " << param.label
-      << " }";
-}
-
 class GetStringTaskTypeTest : public ::testing::TestWithParam<TaskTypeTestCase> {
  protected:
   std::string temp_path;