diff --git a/source/vision/consensus/estimator b/source/vision/consensus/estimator
index 20140f6..93f9898 100644
--- a/source/vision/consensus/estimator
+++ b/source/vision/consensus/estimator
@@ -41,6 +41,10 @@ namespace gtl {
     protected:
         virtual ~estimator() = default;
         estimator() = default;
+        estimator(const estimator&) = default;
+        estimator(estimator&&) = default;
+        estimator& operator=(const estimator&) = default;
+        estimator& operator=(estimator&&) = default;
 
     public:
         virtual size_t generate_models(const data_type* const __restrict data, size_t data_size, model_type* const __restrict models) = 0;
diff --git a/source/vision/consensus/evaluator b/source/vision/consensus/evaluator
index 832323f..818beb5 100644
--- a/source/vision/consensus/evaluator
+++ b/source/vision/consensus/evaluator
@@ -29,6 +29,10 @@ namespace gtl {
     protected:
         virtual ~evaluator() = default;
         evaluator() = default;
+        evaluator(const evaluator&) = default;
+        evaluator(evaluator&&) = default;
+        evaluator& operator=(const evaluator&) = default;
+        evaluator& operator=(evaluator&&) = default;
 
     public:
         virtual float evaluate(
diff --git a/source/vision/consensus/sampler b/source/vision/consensus/sampler
index 85b6d7a..1c923c0 100644
--- a/source/vision/consensus/sampler
+++ b/source/vision/consensus/sampler
@@ -36,6 +36,10 @@ namespace gtl {
     protected:
         virtual ~sampler() = default;
         sampler() = default;
+        sampler(const sampler&) = default;
+        sampler(sampler&&) = default;
+        sampler& operator=(const sampler&) = default;
+        sampler& operator=(sampler&&) = default;
 
         virtual void prepare(const size_t data_size) = 0;