Added tvin arguments for parameters

include/sqlpp11/boolean.h

@@ -32,6 +32,7 @@
 #include <sqlpp11/basic_expression_operators.h>
 #include <sqlpp11/type_traits.h>
 #include <sqlpp11/exception.h>
+#include <sqlpp11/tvin.h>
 #include <sqlpp11/result_field.h>
 
 namespace sqlpp
@@ -60,7 +61,22 @@ namespace sqlpp
 			_parameter_t& operator=(const _cpp_value_type& value)
 			{
 				_value = value;
-				_is_null = (false);
+				_is_null = false;
+				return *this;
+			}
+
+			_parameter_t& operator=(const tvin_t<wrap_operand_t<_cpp_value_type>>& t)
+			{
+				if (t._is_trivial())
+				{
+					_value = false;
+					_is_null = true;
+				}
+				else
+				{
+					_value = t._value._t;
+					_is_null = false;
+				}
 				return *this;
 			}
 

include/sqlpp11/floating_point.h

@@ -63,6 +63,21 @@ namespace sqlpp
 				return *this;
 			}
 
+			_parameter_t& operator=(const tvin_t<wrap_operand_t<_cpp_value_type>>& t)
+			{
+				if (t._is_trivial())
+				{
+					_value = 0;
+					_is_null = true;
+				}
+				else
+				{
+					_value = t._value._t;
+					_is_null = false;
+				}
+				return *this;
+			}
+
 			_parameter_t& operator=(const std::nullptr_t&)
 			{
 				_value = 0;

include/sqlpp11/text.h

@@ -64,6 +64,21 @@ namespace sqlpp
 				return *this;
 			}
 
+			_parameter_t& operator=(const tvin_t<wrap_operand_t<_cpp_value_type>>& t)
+			{
+				if (t._is_trivial())
+				{
+					_value = "";
+					_is_null = true;
+				}
+				else
+				{
+					_value = t._value._t;
+					_is_null = false;
+				}
+				return *this;
+			}
+
 			_parameter_t& operator=(const std::nullptr_t&)
 			{
 				_value = "";

include/sqlpp11/tvin.h

@@ -152,9 +152,9 @@ namespace sqlpp
 		};
 
 	template<typename Operand>
-		auto tvin(Operand operand) -> tvin_arg_t<typename wrap_operand<Operand>::type>
+		auto tvin(Operand operand) -> tvin_arg_t<wrap_operand_t<Operand>>
 		{
-			using _operand_t = typename wrap_operand<Operand>::type;
+			using _operand_t = wrap_operand_t<Operand>;
 			static_assert(not std::is_same<_operand_t, Operand>::value or is_result_field_t<Operand>::value, "tvin() used with invalid type (only string and primitive types allowed)");
 			return {{operand}};
 		}

tests/PreparedTest.cpp

@@ -91,6 +91,7 @@ int main()
 		auto s = select(all_of(t)).from(t).where((t.beta.like(parameter(t.beta)) and t.alpha == parameter(t.alpha)) or t.gamma != parameter(t.gamma));
 		auto p = db.prepare(s);
 		p.params.alpha = 7;
+		p.params.alpha = sqlpp::tvin(0);
 		using S = decltype(s);
 		using T = sqlpp::make_parameter_list_t<S>;
 		T npl;