fix: explicit

Author: YudoTLE

core/include/openballistics/ballistics.hpp

@@ -56,7 +56,7 @@ namespace openballistics
                 0.0,
                 time_of_flight);
 
-            return x.head<3>();
+            return x.template head<3>();
         }
 
         [[nodiscard]] std::vector<vector3> compute_trajectory_impl(
@@ -89,7 +89,7 @@ namespace openballistics
                     {
                         state x;
                         interpolate(x, accumulator);
-                        trajectory.emplace_back(x.head<3>());
+                        trajectory.emplace_back(x.template head<3>());
                         accumulator += sample_interval;
                     }
                 });

core/include/openballistics/trajectory_model/modified_point_mass.hpp

@@ -140,8 +140,8 @@ namespace openballistics::trajectory_model
                 dudt_ = GF_ / m;
             }
 
-            dydt.head<3>() = u_;
-            dydt.segment<3>(3) = dudt_;
+            dydt.template head<3>() = u_;
+            dydt.template segment<3>(3) = dudt_;
             dydt(6) = (0.5 * rho * v * S * d * d * p * C_spin) / I_x;
         }
     };

core/include/openballistics/trajectory_model/point_mass.hpp

@@ -2,6 +2,7 @@
 #define OPENBALLISTICS_TRAJECTORY_MODEL_POINT_MASS_HPP
 
 #include "../types.hpp"
+#include "../numbers.hpp"
 #include <Eigen/Dense>
 
 namespace openballistics::trajectory_model
@@ -63,10 +64,10 @@ namespace openballistics::trajectory_model
 
             const scalar C_D_eff = C_D_0 * i * f_D;
 
-            const scalar S = 0.25 * numbers::pi<double> * d * d;
+            const scalar S = 0.25 * numbers::pi<scalar> * d * d;
 
-            dydt.head<3>() = u_;
-            dydt.tail<3>() = g_ - 0.5 * rho * S * C_D_eff / m * v * v_;
+            dydt.template head<3>() = u_;
+            dydt.template tail<3>() = g_ - 0.5 * rho * S * C_D_eff / m * v * v_;
         }
     };
 }