Fix clang-tidy findings

Author: d-frey

include/tao/operators.hpp

@@ -581,7 +581,7 @@ namespace tao
       template< typename T >
       class incrementable
       {
-         friend T operator++(T& arg, int)noexcept( noexcept( T( arg ), ++arg, T( std::declval< T >() ) ) )
+         friend T operator++( T& arg, int /*unused*/ ) noexcept( noexcept( T( arg ), ++arg, T( std::declval< T >() ) ) )  // NOLINT
          {
             const T nrv( arg );
             ++arg;
@@ -592,7 +592,7 @@ namespace tao
       template< typename T >
       class decrementable
       {
-         friend T operator--(T& arg, int)noexcept( noexcept( T( arg ), --arg, T( std::declval< T >() ) ) )
+         friend T operator--( T& arg, int /*unused*/ ) noexcept( noexcept( T( arg ), --arg, T( std::declval< T >() ) ) )  // NOLINT
          {
             const T nrv( arg );
             --arg;
@@ -606,8 +606,10 @@ namespace tao
            decrementable< T >
       {
       };
-   }
-}
+
+   }  // namespace operators
+
+}  // namespace tao
 
 #undef TAO_OPERATORS_BASIC_OP
 #undef TAO_OPERATORS_BASIC_OP_LEFT

src/test/operators/operators.cpp

@@ -19,11 +19,13 @@ class X
    {
    }
 
-   X( const X& x )
-   noexcept
-      : v_( x.v_ )
-   {
-   }
+   X( const X& ) = default;
+   X( X&& ) = default;
+
+   ~X() = default;
+
+   X& operator=( const X& ) = delete;
+   X& operator=( X&& ) = delete;
 
    X& operator+=( const X& x ) noexcept
    {
@@ -118,24 +120,25 @@ class E
 {
 };
 
-void adl_test( const E& ) {}
+void adl_test( const E& /*unused*/ ) {}
 
 namespace tao
 {
    void adl_test( const E& );
-}
+
+}  // namespace tao
 
 struct S
    : tao::operators::addable< S >
 {
-   S() {}
+   S() = default;
 
    S( const S& a, const S& b )
       : S( a + b )
    {
    }
 
-   S& operator+=( const S& ) noexcept
+   S& operator+=( const S& /*unused*/ ) noexcept
    {
       return *this;
    }