Tests: add placeholder overload for complex matrices

Author: christoph-conrads

TESTING/cpp/tools.hpp

@@ -360,6 +360,14 @@ void print_matrix_to_file(const char* filename, const Matrix& a) {
 	}
 }
 
+template<class Real, class Storage>
+void print_matrix_to_file(const char*, const ublas::matrix<std::complex<Real>, Storage>&)
+{
+	assert(false);
+}
+
+
+
 template<class Matrix>
 void print_machine_readable_matrix(const char* identifier, const Matrix& a) {
 	using Number = typename Matrix::value_type;
@@ -374,6 +382,12 @@ void print_machine_readable_matrix(const char* identifier, const Matrix& a) {
 	}
 }
 
+template<class Real, class Storage>
+void print_machine_readable_matrix(const char*, const ublas::matrix<std::complex<Real>, Storage>&)
+{
+	assert(false);
+}
+
 }
 }