diff --git a/src/interop_facade/facade32.rs b/src/interop_facade/facade32.rs
index 751122074..75a44a3ce 100644
--- a/src/interop_facade/facade32.rs
+++ b/src/interop_facade/facade32.rs
@@ -470,4 +470,36 @@ pub extern fn sifft32(vector: Box<DataVector32>, even_odd: i32) -> VectorResult<
 pub extern fn mirror32(vector: Box<DataVector32>, even_odd: i32) -> VectorResult<DataVector32> {
     let even_odd = translate_to_even_odd(even_odd);
     convert_vec!(vector.mirror(even_odd))
+}
+
+#[no_mangle]
+pub extern fn apply_window32(vector: Box<DataVector32>, window: i32) -> VectorResult<DataVector32> {
+    let window = translate_to_window_function(window);
+    convert_vec!(vector.apply_window(window.as_ref()))
+}
+
+#[no_mangle]
+pub extern fn unapply_window32(vector: Box<DataVector32>, window: i32) -> VectorResult<DataVector32> {
+    let window = translate_to_window_function(window);
+    convert_vec!(vector.unapply_window(window.as_ref()))
+}
+
+
+#[no_mangle]
+pub extern fn windowed_fft32(vector: Box<DataVector32>, window: i32) -> VectorResult<DataVector32> {
+    let window = translate_to_window_function(window);
+    convert_vec!(vector.windowed_fft(window.as_ref()))
+}
+
+#[no_mangle]
+pub extern fn windowed_ifft32(vector: Box<DataVector32>, window: i32) -> VectorResult<DataVector32> {
+    let window = translate_to_window_function(window);
+    convert_vec!(vector.windowed_ifft(window.as_ref()))
+}
+
+#[no_mangle]
+pub extern fn windowed_sifft32(vector: Box<DataVector32>, even_odd: i32, window: i32) -> VectorResult<DataVector32> {
+    let even_odd = translate_to_even_odd(even_odd);
+    let window = translate_to_window_function(window);
+    convert_vec!(vector.windowed_sifft(even_odd, window.as_ref()))
 }
\ No newline at end of file
diff --git a/src/interop_facade/mod.rs b/src/interop_facade/mod.rs
index 18dd2d402..85176f7fd 100644
--- a/src/interop_facade/mod.rs
+++ b/src/interop_facade/mod.rs
@@ -41,6 +41,8 @@ pub mod facade64;
 use vector_types::{
     ErrorReason,
     EvenOdd};
+use window_functions::*;
+use RealNumber;
 
 pub fn translate_error(reason: ErrorReason) -> i32 {
     match reason {
@@ -58,6 +60,15 @@ pub fn translate_to_even_odd(value: i32) -> EvenOdd {
     if value != 0 { EvenOdd::Odd } else { EvenOdd::Even }
 }
 
+pub fn translate_to_window_function<T>(value: i32) -> Box<WindowFunction<T>> 
+    where T: RealNumber {
+    if value == 0 {
+        Box::new(TriangularWindow)
+    } else {
+        Box::new(TriangularWindow)
+    }
+}
+
 /// Result of a vector operation. Check the ```result_code```.
 #[repr(C)]
 pub struct VectorResult<T> {
diff --git a/src/vector_types/time_freq_impl.rs b/src/vector_types/time_freq_impl.rs
index 0d51ea97a..620dd3b90 100644
--- a/src/vector_types/time_freq_impl.rs
+++ b/src/vector_types/time_freq_impl.rs
@@ -78,13 +78,13 @@ pub trait TimeDomainOperations<T> : DataVector<T>
     
     /// Applies a FFT window and performs a Fast Fourier Transformation transforming a time domain vector
 	/// into a frequency domain vector. 
-    fn windowed_fft<W>(self, window: W) -> VecResult<Self::FreqPartner> where W: WindowFunction<T>;
+    fn windowed_fft(self, window: &WindowFunction<T>) -> VecResult<Self::FreqPartner>;
     
     /// Applies a window to the data vector.
-    fn apply_window<W>(self, window: W) -> VecResult<Self> where W: WindowFunction<T>;
+    fn apply_window(self, window: &WindowFunction<T>) -> VecResult<Self>;
     
     /// Removes a window from the data vector.
-    fn unapply_window<W>(self, window: W) -> VecResult<Self> where W: WindowFunction<T>;
+    fn unapply_window(self, window: &WindowFunction<T>) -> VecResult<Self>;
 }
 
 /// Defines all operations which are valid on `DataVectors` containing complex data.
@@ -170,7 +170,7 @@ pub trait FrequencyDomainOperations<T> : DataVector<T>
     
     /// Performs an Inverse Fast Fourier Transformation transforming a frequency domain vector
 	/// into a time domain vector and removes the FFT window.
-    fn windowed_ifft<W>(self, window: W) -> VecResult<Self::ComplexTimePartner> where W: WindowFunction<T>;
+    fn windowed_ifft(self, window: &WindowFunction<T>) -> VecResult<Self::ComplexTimePartner>;
     
     /// Performs a Symmetric Inverse Fast Fourier Transformation (SIFFT) and removes the FFT window. 
     /// The SIFFT is performed under the assumption that `self`
@@ -181,7 +181,7 @@ pub trait FrequencyDomainOperations<T> : DataVector<T>
     /// The argument indicates whether the resulting real vector should have `2*N` or `2*N-1` points.
     /// # Unstable
     /// Symmetric IFFTs are unstable and may only work under certain conditions.
-    fn windowed_sifft<W>(self, even_odd: EvenOdd, window: W) -> VecResult<Self::RealTimePartner> where W: WindowFunction<T>;
+    fn windowed_sifft(self, even_odd: EvenOdd, window: &WindowFunction<T>) -> VecResult<Self::RealTimePartner>;
 }
 
 macro_rules! define_time_domain_forward {
@@ -193,11 +193,11 @@ macro_rules! define_time_domain_forward {
                     Self::FreqPartner::from_genres(self.to_gen().plain_fft())
                 }
                 
-                fn apply_window<W>(self, window: W) -> VecResult<Self> where W: WindowFunction<$data_type> {
+                fn apply_window(self, window: &WindowFunction<$data_type>) -> VecResult<Self> {
                     Self::from_genres(self.to_gen().apply_window(window))
                 }
     
-                fn unapply_window<W>(self, window: W) -> VecResult<Self> where W: WindowFunction<$data_type> {
+                fn unapply_window(self, window: &WindowFunction<$data_type>) -> VecResult<Self> {
                     Self::from_genres(self.to_gen().unapply_window(window))
                 }
                 
@@ -205,7 +205,7 @@ macro_rules! define_time_domain_forward {
                     Self::FreqPartner::from_genres(self.to_gen().fft())
                 }
                 
-                fn windowed_fft<W>(self, window: W) -> VecResult<Self::FreqPartner> where W: WindowFunction<$data_type> {
+                fn windowed_fft(self, window: &WindowFunction<$data_type>) -> VecResult<Self::FreqPartner> {
                     Self::FreqPartner::from_genres(self.to_gen().windowed_fft(window))
                 }
             }
@@ -216,7 +216,7 @@ macro_rules! define_time_domain_forward {
 macro_rules! implement_window_function {
     ($($name:ident, $data_type:ident, $operation: ident);*) => {
         $( 
-            fn $name<W>(mut self, window: W) -> VecResult<Self> where W: WindowFunction<$data_type> {
+            fn $name(mut self, window: &WindowFunction<$data_type>) -> VecResult<Self> {
                     assert_time!(self);
                     if self.is_complex {
                         let len = self.len();
@@ -284,7 +284,7 @@ macro_rules! add_time_freq_impl {
                     .and_then(|v|v.swap_halves())
                 }
                 
-                fn windowed_fft<W>(self, window: W) -> VecResult<Self::FreqPartner> where W: WindowFunction<$data_type> {
+                fn windowed_fft(self, window: &WindowFunction<$data_type>) -> VecResult<Self::FreqPartner> {
                     self.apply_window(window)
                     .and_then(|v|v.plain_fft())
                     .and_then(|v|v.swap_halves())
@@ -374,7 +374,7 @@ macro_rules! add_time_freq_impl {
                     .and_then(|v| v.plain_sifft(even_odd))
                 }
                 
-                fn windowed_ifft<W>(self, window: W) -> VecResult<Self::ComplexTimePartner> where W: WindowFunction<$data_type> {
+                fn windowed_ifft(self, window: &WindowFunction<$data_type>) -> VecResult<Self::ComplexTimePartner> {
                     let points = self.points();
                     self.real_scale(1.0 / points as $data_type)
                     .and_then(|v| v.swap_halves())
@@ -382,7 +382,7 @@ macro_rules! add_time_freq_impl {
                     .and_then(|v|v.unapply_window(window))
                 }
                 
-                fn windowed_sifft<W>(self, even_odd: EvenOdd, window: W) -> VecResult<Self::RealTimePartner> where W: WindowFunction<$data_type> {
+                fn windowed_sifft(self, even_odd: EvenOdd, window: &WindowFunction<$data_type>) -> VecResult<Self::RealTimePartner> {
                     let points = self.points();
                     self.real_scale(1.0 / points as $data_type)
                     .and_then(|v| v.swap_halves())
@@ -414,11 +414,11 @@ macro_rules! add_time_freq_impl {
                     Self::RealTimePartner::from_genres(self.to_gen().sifft(even_odd))
                 }
                 
-                fn windowed_ifft<W>(self, window: W) -> VecResult<Self::ComplexTimePartner> where W: WindowFunction<$data_type> {
+                fn windowed_ifft(self, window: &WindowFunction<$data_type>) -> VecResult<Self::ComplexTimePartner> {
                     Self::ComplexTimePartner::from_genres(self.to_gen().windowed_ifft(window))
                 }
                 
-                fn windowed_sifft<W>(self, even_odd: EvenOdd, window: W) -> VecResult<Self::RealTimePartner> where W: WindowFunction<$data_type> {
+                fn windowed_sifft(self, even_odd: EvenOdd, window: &WindowFunction<$data_type>) -> VecResult<Self::RealTimePartner> {
                     Self::RealTimePartner::from_genres(self.to_gen().windowed_sifft(even_odd, window))
                 }
             }
diff --git a/src/window_functions.rs b/src/window_functions.rs
index 1c308ad01..f117e93f8 100644
--- a/src/window_functions.rs
+++ b/src/window_functions.rs
@@ -11,7 +11,7 @@ use super::RealNumber;
 /// 1. The second argument is of the function is always `self.points()` and the possible values for the first argument ranges from `0..self.points()`.
 /// 2. A window function must be symmetric about the y-axis.
 /// 3. All real return values are allowed
-pub trait WindowFunction<T> : Sized
+pub trait WindowFunction<T>
     where T: RealNumber {
     /// Calculates a point of the window function
     fn window(&self, n: usize, length: usize) -> T;
diff --git a/tests/time_freq_test.rs b/tests/time_freq_test.rs
index 85897d74c..c0aa2bdc6 100644
--- a/tests/time_freq_test.rs
+++ b/tests/time_freq_test.rs
@@ -34,8 +34,8 @@ mod slow_test {
     fn window_real_vs_complex_vector64() {
         let vector = new_sinusoid_vector();
         let complex = vector.clone().to_complex().unwrap();
-        let complex_windowed = complex.apply_window(HammingWindow::default()).unwrap();
-        let real_windowed = vector.apply_window(HammingWindow::default()).unwrap();
+        let complex_windowed = complex.apply_window(&HammingWindow::default()).unwrap();
+        let real_windowed = vector.apply_window(&HammingWindow::default()).unwrap();
         assert_eq!(real_windowed.data(), complex_windowed.to_real().unwrap().data());
     }
     
@@ -62,7 +62,7 @@ mod slow_test {
     fn windowed_fft_vector64() {
         let vector = new_sinusoid_vector();
         let complex = vector.to_complex().unwrap();
-        let fft = complex.windowed_fft(HammingWindow::default()).unwrap().magnitude().unwrap();
+        let fft = complex.windowed_fft(&HammingWindow::default()).unwrap().magnitude().unwrap();
         // Expected data has been created with GNU Octave
         let expected: &[f64] = &[0.07411808515197066, 0.07422272322333621, 0.07453841468679659, 0.07506988195440296, 0.07582541343880053, 
             0.07681696328361777, 0.07806061998281554, 0.07957802869766938, 0.08139483126598358, 0.08354572044699357, 0.0860733404576818, 
@@ -91,8 +91,8 @@ mod slow_test {
     fn windowed_fft_windowed_ifft_vector64() {
         let vector = new_sinusoid_vector();
         let complex = vector.clone().to_complex().unwrap();
-        let fft = complex.windowed_fft(HammingWindow::default()).unwrap();
-        let ifft = fft.windowed_ifft(HammingWindow::default()).unwrap().to_real().unwrap();
+        let fft = complex.windowed_fft(&HammingWindow::default()).unwrap();
+        let ifft = fft.windowed_ifft(&HammingWindow::default()).unwrap().to_real().unwrap();
         assert_vector_eq(vector.data(), ifft.data());   
     }