Fixed templated String constructor and added constructor from bool.

src/TNL/String.cpp

@@ -47,6 +47,13 @@ String::String( const String& str )
    setString( str.getString() );
 }
 
+String::String( const bool b )
+   : string( nullptr ), length( 0 )
+{
+   if( b ) this->setString( "true" );
+   else this->setString( "false" );
+}
+
 String String::getType()
 {
    return String( "String" );

src/TNL/String.h

@@ -59,7 +59,7 @@ public:
    /// definition ( in operator << ). It leads to stack overflow and segmentation fault.
    template< typename T >
    explicit
-   String( T value )
+   String( const T& value )
       : string( nullptr ), length( 0 )
    {
       std::stringstream str;
@@ -67,6 +67,8 @@ public:
       setString( str.str().data() );
    }
 
+   String( const bool b );
+
    //! Destructor
    ~String();
    

src/UnitTests/Containers/ListTest.cpp

@@ -41,16 +41,17 @@ TYPED_TEST_CASE( ListTest, ListTypes );
 TYPED_TEST( ListTest, constructor )
 {
    using ListType = typename TestFixture::ListType;
+   using ValueType = typename ListType::ValueType;
 
    ListType list;
    EXPECT_TRUE( list.isEmpty() );
    EXPECT_EQ( list.getSize(), 0 );
 
-   list.Append( 0 );
+   list.Append( ( ValueType ) 0 );
    EXPECT_EQ( list.getSize(), 1 );
 
    ListType copy( list );
-   list.Append( 0 );
+   list.Append( ( ValueType ) 0 );
    EXPECT_EQ( list.getSize(), 2 );
    EXPECT_EQ( copy.getSize(), 1 );
    EXPECT_EQ( copy[ 0 ], list[ 0 ] );