[clang-tidy] modernize-use-equals-default (#5719)

script/make-pretty

@@ -117,6 +117,7 @@ readonly OT_CLANG_TIDY_BUILD_OPTS=(
 readonly OT_CLANG_TIDY_CHECKS="\
 -*,\
 modernize-use-bool-literals,\
+modernize-use-equals-default,\
 modernize-use-equals-delete,\
 modernize-use-nullptr,\
 readability-avoid-const-params-in-decls,\

src/core/common/locator.hpp

@@ -115,7 +115,7 @@ protected:
     }
 
 private:
-    InstanceLocator(void) {}
+    InstanceLocator(void) = default;
 
 #if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
     Instance *mInstance;

src/core/common/non_copyable.hpp

@@ -47,7 +47,7 @@ public:
     NonCopyable &operator=(const NonCopyable &) = delete;
 
 protected:
-    NonCopyable(void) {}
+    NonCopyable(void) = default;
 };
 
 } // namespace ot

src/core/common/time.hpp

@@ -68,7 +68,7 @@ public:
      * This is the default constructor for a `Time` object.
      *
      */
-    Time(void) {}
+    Time(void) = default;
 
     /**
      * This constructor initializes a `Time` object with a given value.

src/core/thread/link_metrics_tlvs.hpp

@@ -82,7 +82,7 @@ public:
      * Default constructor.
      *
      */
-    LinkMetricsTypeIdFlags(void) {}
+    LinkMetricsTypeIdFlags(void) = default;
 
     /**
      * Constructor for implicit cast from `uint8_t` to `LinkMetricsTypeIdFlags`.

src/core/thread/mle_types.hpp

@@ -327,7 +327,7 @@ public:
      * This is the default constructor for `DeviceMode` object.
      *
      */
-    DeviceMode(void) {}
+    DeviceMode(void) = default;
 
     /**
      * This constructor initializes a `DeviceMode` object from a given mode TLV bitmask.