build: Added an option to disable UDLs support

Now it is time to get rid of UDLs from tests and examples and then disable them by default.
2021-04-01 09:36:55 +02:00
1 parent 309da80c32
commit 9054420d08
@@ -62,6 +62,8 @@ struct dim_absorbed_dose : isq::dim_absorbed_dose<dim_absorbed_dose, gray, dim_e
 template<UnitOf<dim_absorbed_dose> U, Representation Rep = double>
 using absorbed_dose = quantity<dim_absorbed_dose, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // Gy
@@ -150,6 +152,8 @@ constexpr auto operator"" _q_YGy(long double l) { return absorbed_dose<yottagray

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto Gy = reference<dim_absorbed_dose, gray>{};
@@ -39,6 +39,8 @@ struct dim_acceleration : isq::dim_acceleration<dim_acceleration, metre_per_seco
 template<UnitOf<dim_acceleration> U, Representation Rep = double>
 using acceleration = quantity<dim_acceleration, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // m/s2
@@ -47,4 +49,6 @@ constexpr auto operator"" _q_m_per_s2(long double l) { return acceleration<metre

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -41,6 +41,8 @@ struct dim_amount_of_substance : isq::dim_amount_of_substance<mole> {};
 template<UnitOf<dim_amount_of_substance> U, Representation Rep = double>
 using amount_of_substance = quantity<dim_amount_of_substance, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // mol
@@ -49,6 +51,8 @@ constexpr auto operator"" _q_mol(long double l) { return amount_of_substance<mol

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto mol = reference<dim_amount_of_substance, mole>{};
@@ -41,6 +41,8 @@ struct dim_angular_velocity : isq::dim_angular_velocity<dim_angular_velocity, ra
 template<UnitOf<dim_angular_velocity> U, Representation Rep = double>
 using angular_velocity = quantity<dim_angular_velocity, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // rad / s
@@ -49,4 +51,6 @@ constexpr auto operator"" _q_rad_per_s(long double l) { return angular_velocity<

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -63,6 +63,8 @@ struct hectare : alias_unit<square_hectometre, "ha", no_prefix> {};
 template<UnitOf<dim_area> U, Representation Rep = double>
 using area = quantity<dim_area, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // m2
@@ -155,6 +157,8 @@ constexpr auto operator"" _q_ha(long double l) { return area<hectare, long doubl

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto m2 = reference<dim_area, square_metre>{};
@@ -63,6 +63,8 @@ struct dim_capacitance : isq::dim_capacitance<dim_capacitance, farad, dim_electr
 template<UnitOf<dim_capacitance> U, Representation Rep = double>
 using capacitance = quantity<dim_capacitance, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // F
@@ -151,6 +153,8 @@ constexpr auto operator"" _q_YF(long double l) { return capacitance<yottafarad,

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto F = reference<dim_capacitance, farad>{};
@@ -65,6 +65,8 @@ struct dim_catalytic_activity : isq::dim_catalytic_activity<dim_catalytic_activi
 template<UnitOf<dim_catalytic_activity> U, Representation Rep = double>
 using catalytic_activity = quantity<dim_catalytic_activity, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // kat
@@ -157,6 +159,8 @@ constexpr auto operator"" _q_U(long double l) { return catalytic_activity<enzyme

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto kat = reference<dim_catalytic_activity, katal>{};
@@ -47,6 +47,8 @@ using charge_density = quantity<dim_charge_density, U, Rep>;
 template<UnitOf<dim_surface_charge_density> U, Representation Rep = double>
 using surface_charge_density = quantity<dim_surface_charge_density, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // C/m³
@@ -59,4 +61,6 @@ constexpr auto operator"" _q_C_per_m2(long double l) { return surface_charge_den

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -40,6 +40,8 @@ struct dim_concentration : isq::dim_concentration<dim_concentration, mol_per_met
 template<UnitOf<dim_concentration> U, Representation Rep = double>
 using concentration = quantity<dim_concentration, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // mol/m³
@@ -48,5 +50,7 @@ constexpr auto operator"" _q_mol_per_m3(long double l) { return concentration<mo

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si

@@ -58,6 +58,8 @@ struct dim_conductance : isq::dim_conductance<dim_conductance, siemens, dim_resi
 template<UnitOf<dim_conductance> U, Representation Rep = double>
 using conductance = quantity<dim_conductance, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // R
@@ -130,6 +132,8 @@ constexpr auto operator"" _q_YS(long double l) { return conductance<yottasiemens

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto S = reference<dim_conductance, siemens>{};
@@ -42,6 +42,8 @@ struct dim_current_density : isq::dim_current_density<dim_current_density, amper
 template<UnitOf<dim_current_density> U, Representation Rep = double>
 using current_density = quantity<dim_current_density, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // A / m²
@@ -50,4 +52,6 @@ constexpr auto operator"" _q_A_per_m2(long double l) { return current_density<am

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -42,6 +42,8 @@ struct dim_density : isq::dim_density<dim_density, kilogram_per_metre_cub, dim_m
 template<UnitOf<dim_density> U, Representation Rep = double>
 using density = quantity<dim_density, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // kg / m³
@@ -50,4 +52,6 @@ constexpr auto operator"" _q_kg_per_m3(long double l) { return density<kilogram_

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -40,6 +40,8 @@ struct dim_dynamic_viscosity : isq::dim_dynamic_viscosity<dim_dynamic_viscosity,
 template<UnitOf<dim_dynamic_viscosity> U, Representation Rep = double>
 using dynamic_viscosity = quantity<dim_dynamic_viscosity, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // Pa·s
@@ -48,5 +50,7 @@ constexpr auto operator"" _q_Pa_s(long double l) { return dynamic_viscosity<pasc

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si

@@ -42,6 +42,8 @@ struct dim_electric_charge : isq::dim_electric_charge<dim_electric_charge, coulo
 template<UnitOf<dim_electric_charge> U, Representation Rep = double>
 using electric_charge = quantity<dim_electric_charge, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // C
@@ -50,6 +52,8 @@ constexpr auto operator"" _q_C(long double l) { return electric_charge<coulomb,

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto C = reference<dim_electric_charge, coulomb>{};
@@ -61,6 +61,8 @@ struct dim_electric_current : isq::dim_electric_current<ampere> {};
 template<UnitOf<dim_electric_current> U, Representation Rep = double>
 using electric_current = quantity<dim_electric_current, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // A
@@ -149,6 +151,8 @@ constexpr auto operator"" _q_YA(long double l) { return electric_current<yottaam

 } // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto A = reference<dim_electric_current, ampere>{};
@@ -39,6 +39,8 @@ struct dim_electric_field_strength : isq::dim_electric_field_strength<dim_electr
 template<UnitOf<dim_electric_field_strength> U, Representation Rep = double>
 using electric_field_strength = quantity<dim_electric_field_strength, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // V/m
@@ -47,4 +49,6 @@ constexpr auto operator"" _q_V_per_m(long double l) { return electric_field_stre

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -61,6 +61,8 @@ struct dim_energy : isq::dim_energy<dim_energy, joule, dim_force, dim_length> {}
 template<UnitOf<dim_energy> U, Representation Rep = double>
 using energy = quantity<dim_energy, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // J
@@ -141,6 +143,8 @@ constexpr auto operator"" _q_GeV(long double l) { return energy<gigaelectronvolt

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto J = reference<dim_energy, joule>{};
@@ -40,6 +40,8 @@ struct dim_energy_density : isq::dim_energy_density<dim_energy_density, joule_pe
 template<UnitOf<dim_energy_density> U, Representation Rep = double>
 using energy_density = quantity<dim_energy_density, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // N/m
@@ -48,4 +50,6 @@ constexpr auto operator"" _q_J_per_m3(long double l) { return energy_density<jou

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -63,6 +63,8 @@ struct dim_force : isq::dim_force<dim_force, newton, dim_mass, dim_acceleration>
 template<UnitOf<dim_force> U, Representation Rep = double>
 using force = quantity<dim_force, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // N
@@ -151,6 +153,8 @@ constexpr auto operator"" _q_YN(long double l) { return force<yottanewton, long

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto N = reference<dim_force, newton>{};
@@ -57,6 +57,8 @@ struct dim_frequency : isq::dim_frequency<dim_frequency, hertz, dim_time> {};
 template<UnitOf<dim_frequency> U, Representation Rep = double>
 using frequency = quantity<dim_frequency, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // Hz
@@ -129,6 +131,8 @@ constexpr auto operator"" _q_YHz(long double l) { return frequency<yottahertz, l

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto Hz = reference<dim_frequency, hertz>{};
@@ -53,6 +53,8 @@ using specific_heat_capacity = quantity<dim_specific_heat_capacity, U, Rep>;
 template<UnitOf<dim_molar_heat_capacity> U, Representation Rep = double>
 using molar_heat_capacity = quantity<dim_molar_heat_capacity, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // J/K
@@ -69,5 +71,7 @@ constexpr auto operator"" _q_J_per_mol_K(long double l) { return molar_heat_capa

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si

@@ -59,6 +59,8 @@ struct dim_inductance : isq::dim_inductance<dim_inductance, henry, dim_magnetic_
 template<UnitOf<dim_inductance> U, Representation Rep = double>
 using inductance = quantity<dim_inductance, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // H
@@ -131,6 +133,8 @@ constexpr auto operator"" _q_YH(long double l) { return inductance<yottahenry, l

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto H = reference<dim_inductance, henry>{};
@@ -63,6 +63,8 @@ struct dim_length : isq::dim_length<metre> {};
 template<UnitOf<dim_length> U, Representation Rep = double>
 using length = quantity<dim_length, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // m
@@ -155,6 +157,8 @@ constexpr auto operator"" _q_au(long double l) { return length<astronomical_unit

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto m = reference<dim_length, metre>{};
@@ -40,6 +40,8 @@ struct dim_luminance : isq::dim_luminance<dim_luminance, candela_per_metre_sq, d
 template<UnitOf<dim_luminance> U, Representation Rep = double>
 using luminance = quantity<dim_luminance, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // cd/m²
@@ -48,5 +50,7 @@ constexpr auto operator"" _q_cd_per_m2(long double l) { return luminance<candela

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si

@@ -61,6 +61,8 @@ struct dim_luminous_intensity : isq::dim_luminous_intensity<candela> {};
 template<UnitOf<dim_luminous_intensity> U, Representation Rep = double>
 using luminous_intensity = quantity<dim_luminous_intensity, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // cd
@@ -149,6 +151,8 @@ constexpr auto operator"" _q_Ycd(long double l) { return luminous_intensity<yott

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto cd = reference<dim_luminous_intensity, candela>{};
@@ -59,6 +59,8 @@ struct dim_magnetic_flux : isq::dim_magnetic_flux<dim_magnetic_flux, weber, dim_
 template<UnitOf<dim_magnetic_flux> U, Representation Rep = double>
 using magnetic_flux = quantity<dim_magnetic_flux, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // Wb
@@ -131,6 +133,8 @@ constexpr auto operator"" _q_YWb(long double l) { return magnetic_flux<yottawebe

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto Wb = reference<dim_magnetic_flux, weber>{};
@@ -63,6 +63,8 @@ struct dim_magnetic_induction : isq::dim_magnetic_induction<dim_magnetic_inducti
 template<UnitOf<dim_magnetic_induction> U, Representation Rep = double>
 using magnetic_induction = quantity<dim_magnetic_induction, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // T
@@ -139,6 +141,8 @@ constexpr auto operator"" _q_G(long double l) { return magnetic_induction<gauss,

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto T = reference<dim_magnetic_induction, tesla>{};
@@ -85,6 +85,8 @@ struct dim_mass : isq::dim_mass<kilogram> {};
 template<UnitOf<dim_mass> U, Representation Rep = double>
 using mass = quantity<dim_mass, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // g
@@ -261,6 +263,8 @@ constexpr auto operator"" _q_Da(long double l) { return mass<dalton, long double

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto g = reference<dim_mass, gram>{};
@@ -42,6 +42,8 @@ struct dim_molar_energy : isq::dim_molar_energy<dim_molar_energy, joule_per_mole
 template<UnitOf<dim_molar_energy> U, Representation Rep = double>
 using molar_energy = quantity<dim_molar_energy, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // J/mol
@@ -50,4 +52,6 @@ constexpr auto operator"" _q_J_per_mol(long double l) { return molar_energy<joul

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -40,6 +40,8 @@ struct dim_momentum : isq::dim_momentum<dim_momentum, kilogram_metre_per_second,
 template<UnitOf<dim_momentum> U, Representation Rep = double>
 using momentum = quantity<dim_momentum, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // kg*m/s
@@ -48,4 +50,6 @@ constexpr auto operator"" _q_kg_m_per_s(long double l) { return momentum<kilogra

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -41,6 +41,8 @@ struct dim_permeability : isq::dim_permeability<dim_permeability, henry_per_metr
 template<UnitOf<dim_permeability> U, Representation Rep = double>
 using permeability = quantity<dim_permeability, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // H/m
@@ -49,5 +51,7 @@ constexpr auto operator"" _q_H_per_m(long double l) { return permeability<henry_

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si

@@ -41,6 +41,8 @@ struct dim_permittivity : isq::dim_permittivity<dim_permittivity, farad_per_metr
 template<UnitOf<dim_permittivity> U, Representation Rep = double>
 using permittivity = quantity<dim_permittivity, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // F/m
@@ -49,5 +51,7 @@ constexpr auto operator"" _q_F_per_m(long double l) { return permittivity<farad_

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si

@@ -58,6 +58,8 @@ struct dim_power : isq::dim_power<dim_power, watt, dim_energy, dim_time> {};
 template<UnitOf<dim_power> U, Representation Rep = double>
 using power = quantity<dim_power, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // W
@@ -130,6 +132,8 @@ constexpr auto operator"" _q_YW(long double l) { return power<yottawatt, long do

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto W = reference<dim_power, watt>{};
@@ -63,6 +63,8 @@ struct dim_pressure : isq::dim_pressure<dim_pressure, pascal, dim_force, dim_are
 template<UnitOf<dim_pressure> U, Representation Rep = double>
 using pressure = quantity<dim_pressure, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // Pa
@@ -151,6 +153,8 @@ constexpr auto operator"" _q_YPa(long double l) { return pressure<yottapascal, l

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto Pa = reference<dim_pressure, pascal>{};
@@ -61,6 +61,8 @@ struct dim_radioactivity : isq::dim_radioactivity<dim_radioactivity, becquerel,
 template<UnitOf<dim_radioactivity> U, Representation Rep = double>
 using radioactivity = quantity<dim_radioactivity, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // Bq
@@ -149,6 +151,8 @@ constexpr auto operator"" _q_YBq(long double l) { return radioactivity<yottabecq

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto Bq = reference<dim_radioactivity, becquerel>{};
@@ -59,6 +59,8 @@ struct dim_resistance : isq::dim_resistance<dim_resistance, ohm, dim_voltage, di
 template<UnitOf<dim_resistance> U, Representation Rep = double>
 using resistance = quantity<dim_resistance, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // R
@@ -131,6 +133,8 @@ constexpr auto operator"" _q_YR(long double l) { return resistance<yottaohm, lon

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto R = reference<dim_resistance, ohm>{};
@@ -42,6 +42,8 @@ struct kilometre_per_hour : deduced_unit<kilometre_per_hour, dim_speed, kilometr
 template<UnitOf<dim_speed> U, Representation Rep = double>
 using speed = quantity<dim_speed, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // m/s
@@ -54,4 +56,6 @@ constexpr auto operator"" _q_km_per_h(long double l) { return speed<kilometre_pe

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -40,6 +40,8 @@ struct dim_surface_tension : isq::dim_surface_tension<dim_surface_tension, newto
 template<UnitOf<dim_surface_tension> U, Representation Rep = double>
 using surface_tension = quantity<dim_surface_tension, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // N/m
@@ -48,4 +50,6 @@ constexpr auto operator"" _q_N_per_m(long double l) { return surface_tension<new

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -41,6 +41,8 @@ struct dim_thermal_conductivity : isq::dim_thermal_conductivity<dim_thermal_cond
 template<UnitOf<dim_thermal_conductivity> U, Representation Rep = double>
 using thermal_conductivity = quantity<dim_thermal_conductivity, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // W/(m K)
@@ -49,4 +51,6 @@ constexpr auto operator"" _q_W_per_m_K(long double l) { return thermal_conductiv

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -40,6 +40,8 @@ struct dim_thermodynamic_temperature : isq::dim_thermodynamic_temperature<kelvin
 template<UnitOf<dim_thermodynamic_temperature> U, Representation Rep = double>
 using thermodynamic_temperature = quantity<dim_thermodynamic_temperature, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // K
@@ -48,6 +50,8 @@ constexpr auto operator"" _q_K(long double l) { return thermodynamic_temperature

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto K = reference<dim_thermodynamic_temperature, kelvin>{};
@@ -52,6 +52,8 @@ struct dim_time : isq::dim_time<second> {};
 template<UnitOf<dim_time> U, Representation Rep = double>
 using time = quantity<dim_time, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // ys
@@ -104,6 +106,8 @@ constexpr auto operator"" _q_d(long double l) { return time<day, long double>(l)

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto ys = reference<dim_time, yoctosecond>{};
@@ -42,6 +42,8 @@ struct dim_torque : isq::dim_torque<dim_torque, newton_metre_per_radian, dim_for
 template<UnitOf<dim_torque> U, Representation Rep = double>
 using torque = quantity<dim_torque, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // Nm
@@ -50,4 +52,6 @@ constexpr auto operator"" _q_Nm_per_rad(long double l) { return torque<newton_me

 }  // namespace literals

+#endif // UNITS_UDLS
+
 }  // namespace units::isq::si
@@ -63,6 +63,8 @@ struct dim_voltage : isq::dim_voltage<dim_voltage, volt, dim_power, dim_electric
 template<UnitOf<dim_voltage> U, Representation Rep = double>
 using voltage = quantity<dim_voltage, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // V
@@ -151,6 +153,8 @@ constexpr auto operator"" _q_YV(long double l) { return voltage<yottavolt, long

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto V = reference<dim_voltage, volt>{};
@@ -83,6 +83,8 @@ struct yottalitre : prefixed_unit<yottalitre, yotta, litre> {};
 template<UnitOf<dim_volume> U, Representation Rep = double>
 using volume = quantity<dim_volume, U, Rep>;

+#if UNITS_UDLS
+
 inline namespace literals {

 // m3
@@ -255,6 +257,8 @@ constexpr auto operator"" _q_Yl(long double l) { return volume<yottalitre, long

 }  // namespace literals

+#endif // UNITS_UDLS
+
 namespace references {

 inline constexpr auto m3 = reference<dim_volume, cubic_metre>{};