uhd: created a meta range that is a range of ranges for gains and freqs

created a templated range that that holds a start, stop, and step

created a meta-range template that is a vector of ranges
meta-range can calculate the overall start, stop, step
or be indexed to get at components

replaced instances of range.min, max, step with the functions
start() stop() and step()

the xcvr frequency range is now expressed in as two ranges
(have to fix its clip function though)

9 files changed, 68 insertions, 95 deletions

diff --git a/host/lib/types.cpp b/host/lib/types.cpp
index e5e6a2512..8ccb664d5 100644
--- a/host/lib/types.cpp
+++ b/host/lib/types.cpp
@@ -16,7 +16,6 @@
 //
 
 #include <uhd/utils/assert.hpp>
-#include <uhd/types/ranges.hpp>
 #include <uhd/types/tune_request.hpp>
 #include <uhd/types/tune_result.hpp>
 #include <uhd/types/clock_config.hpp>
@@ -41,24 +40,6 @@
 using namespace uhd;
 
 /***********************************************************************
- * ranges
- **********************************************************************/
-gain_range_t::gain_range_t(float min, float max, float step):
-    min(min),
-    max(max),
-    step(step)
-{
-    /* NOP */
-}
-
-freq_range_t::freq_range_t(double min, double max):
-    min(min),
-    max(max)
-{
-    /* NOP */
-}
-
-/***********************************************************************
  * tune request
  **********************************************************************/
 tune_request_t::tune_request_t(double target_freq):
diff --git a/host/lib/usrp/dboard/db_dbsrx.cpp b/host/lib/usrp/dboard/db_dbsrx.cpp
index 85251bdf9..70bf03158 100644
--- a/host/lib/usrp/dboard/db_dbsrx.cpp
+++ b/host/lib/usrp/dboard/db_dbsrx.cpp
@@ -212,10 +212,10 @@ dbsrx::dbsrx(ctor_args_t args) : rx_dboard_base(args){
 
     //set defaults for LO, gains, and filter bandwidth
     _bandwidth = 33e6;
-    set_lo_freq(dbsrx_freq_range.min);
+    set_lo_freq(dbsrx_freq_range.start());
 
     BOOST_FOREACH(const std::string &name, dbsrx_gain_ranges.keys()){
-        set_gain(dbsrx_gain_ranges[name].min, name);
+        set_gain(dbsrx_gain_ranges[name].start(), name);
     }
 
     set_bandwidth(33e6); // default bandwidth from datasheet
@@ -229,7 +229,7 @@ dbsrx::~dbsrx(void){
  * Tuning
  **********************************************************************/
 void dbsrx::set_lo_freq(double target_freq){
-    target_freq = std::clip(target_freq, dbsrx_freq_range.min, dbsrx_freq_range.max);
+    target_freq = std::clip(target_freq, dbsrx_freq_range.start(), dbsrx_freq_range.stop());
 
     double actual_freq=0.0, pfd_freq=0.0, ref_clock=0.0;
     int R=0, N=0, r=0, m=0;
@@ -261,7 +261,7 @@ void dbsrx::set_lo_freq(double target_freq){
             pfd_freq = ref_clock / R;
 
             //constrain the PFD frequency to specified range
-            if ((pfd_freq < dbsrx_pfd_freq_range.min) or (pfd_freq > dbsrx_pfd_freq_range.max)) continue;
+            if ((pfd_freq < dbsrx_pfd_freq_range.start()) or (pfd_freq > dbsrx_pfd_freq_range.stop())) continue;
 
             //compute N
             N = int(std::floor(target_freq/pfd_freq));
@@ -278,7 +278,7 @@ void dbsrx::set_lo_freq(double target_freq){
     //Assert because we failed to find a suitable combination of ref_clock, R and N 
     UHD_ASSERT_THROW(ref_clock <= 27.0e6 and ref_clock >= 0.0);
     UHD_ASSERT_THROW(ref_clock/m >= 1e6 and ref_clock/m <= 2.5e6);
-    UHD_ASSERT_THROW((pfd_freq >= dbsrx_pfd_freq_range.min) and (pfd_freq <= dbsrx_pfd_freq_range.max));
+    UHD_ASSERT_THROW((pfd_freq >= dbsrx_pfd_freq_range.start()) and (pfd_freq <= dbsrx_pfd_freq_range.stop()));
     UHD_ASSERT_THROW((N >= 256) and (N <= 32768));
 
     if(dbsrx_debug) std::cerr << boost::format(
@@ -417,7 +417,7 @@ void dbsrx::set_lo_freq(double target_freq){
  */
 static int gain_to_gc2_vga_reg(float &gain){
     int reg = 0;
-    gain = std::clip<float>(float(boost::math::iround(gain)), dbsrx_gain_ranges["GC2"].min, dbsrx_gain_ranges["GC2"].max);
+    gain = std::clip(gain, dbsrx_gain_ranges["GC2"].start(), dbsrx_gain_ranges["GC2"].stop());
 
     // Half dB steps from 0-5dB, 1dB steps from 5-24dB
     if (gain < 5) {
@@ -443,11 +443,11 @@ static int gain_to_gc2_vga_reg(float &gain){
  */
 static float gain_to_gc1_rfvga_dac(float &gain){
     //clip the input
-    gain = std::clip<float>(gain, dbsrx_gain_ranges["GC1"].min, dbsrx_gain_ranges["GC1"].max);
+    gain = std::clip(gain, dbsrx_gain_ranges["GC1"].start(), dbsrx_gain_ranges["GC1"].stop());
 
     //voltage level constants
     static const float max_volts = float(1.2), min_volts = float(2.7);
-    static const float slope = (max_volts-min_volts)/dbsrx_gain_ranges["GC1"].max;
+    static const float slope = (max_volts-min_volts)/dbsrx_gain_ranges["GC1"].stop();
 
     //calculate the voltage for the aux dac
     float dac_volts = gain*slope + min_volts;
diff --git a/host/lib/usrp/dboard/db_rfx.cpp b/host/lib/usrp/dboard/db_rfx.cpp
index 152198c3a..bb9e19708 100644
--- a/host/lib/usrp/dboard/db_rfx.cpp
+++ b/host/lib/usrp/dboard/db_rfx.cpp
@@ -93,9 +93,9 @@ public:
     void tx_set(const wax::obj &key, const wax::obj &val);
 
 private:
-    freq_range_t _freq_range;
-    uhd::dict<std::string, gain_range_t> _rx_gain_ranges;
-    uhd::dict<dboard_iface::unit_t, bool> _div2;
+    const freq_range_t _freq_range;
+    const uhd::dict<std::string, gain_range_t> _rx_gain_ranges;
+    const uhd::dict<dboard_iface::unit_t, bool> _div2;
     double       _rx_lo_freq, _tx_lo_freq;
     std::string  _rx_ant;
     uhd::dict<std::string, float> _rx_gains;
@@ -168,19 +168,17 @@ rfx_xcvr::rfx_xcvr(
     ctor_args_t args,
     const freq_range_t &freq_range,
     bool rx_div2, bool tx_div2
-) : xcvr_dboard_base(args){
-    _freq_range = freq_range;
-    _div2[dboard_iface::UNIT_RX] = rx_div2;
-    _div2[dboard_iface::UNIT_TX] = tx_div2;
-
-    if(this->get_rx_id() == 0x0024) { //RFX400
-        _rx_gain_ranges = rfx400_rx_gain_ranges;
-    }
-    else {
-        _rx_gain_ranges = rfx_rx_gain_ranges;
-    }
-
-
+):
+    xcvr_dboard_base(args),
+    _freq_range(freq_range),
+    _rx_gain_ranges((this->get_rx_id() == 0x0024)?
+        rfx400_rx_gain_ranges : rfx_rx_gain_ranges
+    ),
+    _div2(map_list_of
+        (dboard_iface::UNIT_RX, rx_div2)
+        (dboard_iface::UNIT_TX, tx_div2)
+    )
+{
     //enable the clocks that we need
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_TX, true);
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_RX, true);
@@ -204,12 +202,12 @@ rfx_xcvr::rfx_xcvr(
     this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_FULL_DUPLEX, POWER_UP | ANT_RX2| MIXER_ENB);
 
     //set some default values
-    set_rx_lo_freq((_freq_range.min + _freq_range.max)/2.0);
-    set_tx_lo_freq((_freq_range.min + _freq_range.max)/2.0);
+    set_rx_lo_freq((_freq_range.start() + _freq_range.stop())/2.0);
+    set_tx_lo_freq((_freq_range.start() + _freq_range.stop())/2.0);
     set_rx_ant("RX2");
 
     BOOST_FOREACH(const std::string &name, _rx_gain_ranges.keys()){
-        set_rx_gain(_rx_gain_ranges[name].min, name);
+        set_rx_gain(_rx_gain_ranges[name].start(), name);
     }
 }
 
@@ -265,7 +263,7 @@ void rfx_xcvr::set_rx_gain(float gain, const std::string &name){
     assert_has(_rx_gain_ranges.keys(), name, "rfx rx gain name");
     if(name == "PGA0"){
         float dac_volts = rx_pga0_gain_to_dac_volts(gain, 
-                              (_rx_gain_ranges["PGA0"].max - _rx_gain_ranges["PGA0"].min));
+                              (_rx_gain_ranges["PGA0"].stop() - _rx_gain_ranges["PGA0"].start()));
         _rx_gains[name] = gain;
 
         //write the new voltage to the aux dac
@@ -294,7 +292,7 @@ double rfx_xcvr::set_lo_freq(
     ) % (target_freq/1e6) << std::endl;
 
     //clip the input
-    target_freq = std::clip(target_freq, _freq_range.min, _freq_range.max);
+    target_freq = std::clip(target_freq, _freq_range.start(), _freq_range.stop());
     if (_div2[unit]) target_freq *= 2;
 
     //map prescalers to the register enums
diff --git a/host/lib/usrp/dboard/db_tvrx.cpp b/host/lib/usrp/dboard/db_tvrx.cpp
index 2873e3d54..94ab86898 100644
--- a/host/lib/usrp/dboard/db_tvrx.cpp
+++ b/host/lib/usrp/dboard/db_tvrx.cpp
@@ -200,12 +200,12 @@ tvrx::tvrx(ctor_args_t args) : rx_dboard_base(args){
     //send initial register settings if necessary
 
     //set default freq
-    _lo_freq = tvrx_freq_range.min + tvrx_if_freq; //init _lo_freq to a sane default
-    set_freq(tvrx_freq_range.min);
+    _lo_freq = tvrx_freq_range.start() + tvrx_if_freq; //init _lo_freq to a sane default
+    set_freq(tvrx_freq_range.start());
 
     //set default gains
     BOOST_FOREACH(const std::string &name, get_tvrx_gain_ranges().keys()){
-        set_gain(get_tvrx_gain_ranges()[name].min, name);
+        set_gain(get_tvrx_gain_ranges()[name].start(), name);
     }
 }
 
@@ -219,7 +219,7 @@ tvrx::~tvrx(void){
 
 static std::string get_band(double freq) {
     BOOST_FOREACH(const std::string &band, tvrx_freq_ranges.keys()) {
-        if(freq >= tvrx_freq_ranges[band].min && freq <= tvrx_freq_ranges[band].max){
+        if(freq >= tvrx_freq_ranges[band].start() && freq <= tvrx_freq_ranges[band].stop()){
             if(tvrx_debug) std::cout << "Band: " << band << std::endl;
             return band;
         }
@@ -277,7 +277,7 @@ static double gain_interp(double gain, boost::array<double, 17> db_vector, boost
 
 static float rf_gain_to_voltage(float gain, double lo_freq){
     //clip the input
-    gain = std::clip<float>(gain, get_tvrx_gain_ranges()["RF"].min, get_tvrx_gain_ranges()["RF"].max);
+    gain = std::clip(gain, get_tvrx_gain_ranges()["RF"].start(), get_tvrx_gain_ranges()["RF"].stop());
 
     //first we need to find out what band we're in, because gains are different across different bands
     std::string band = get_band(lo_freq + tvrx_if_freq);
@@ -305,7 +305,7 @@ static float rf_gain_to_voltage(float gain, double lo_freq){
 
 static float if_gain_to_voltage(float gain){
     //clip the input
-    gain = std::clip<float>(gain, get_tvrx_gain_ranges()["IF"].min, get_tvrx_gain_ranges()["IF"].max);
+    gain = std::clip(gain, get_tvrx_gain_ranges()["IF"].start(), get_tvrx_gain_ranges()["IF"].stop());
 
     double gain_volts = gain_interp(gain, tvrx_if_gains_db, tvrx_gains_volts);
     double dac_volts = gain_volts / opamp_gain;
@@ -337,7 +337,7 @@ void tvrx::set_gain(float gain, const std::string &name){
  */
 
 void tvrx::set_freq(double freq) {
-    freq = std::clip<double>(freq, tvrx_freq_range.min, tvrx_freq_range.max);
+    freq = std::clip(freq, tvrx_freq_range.start(), tvrx_freq_range.stop());
     std::string prev_band = get_band(_lo_freq - tvrx_if_freq);
     std::string new_band = get_band(freq);
 
diff --git a/host/lib/usrp/dboard/db_wbx.cpp b/host/lib/usrp/dboard/db_wbx.cpp
index 572f5de97..d68cd4eaa 100644
--- a/host/lib/usrp/dboard/db_wbx.cpp
+++ b/host/lib/usrp/dboard/db_wbx.cpp
@@ -177,15 +177,15 @@ wbx_xcvr::wbx_xcvr(ctor_args_t args) : xcvr_dboard_base(args){
     ) % RXIO_MASK % TXIO_MASK << std::endl;
 
     //set some default values
-    set_rx_lo_freq((wbx_freq_range.min + wbx_freq_range.max)/2.0);
-    set_tx_lo_freq((wbx_freq_range.min + wbx_freq_range.max)/2.0);
+    set_rx_lo_freq((wbx_freq_range.start() + wbx_freq_range.stop())/2.0);
+    set_tx_lo_freq((wbx_freq_range.start() + wbx_freq_range.stop())/2.0);
     set_rx_ant("RX2");
 
     BOOST_FOREACH(const std::string &name, wbx_tx_gain_ranges.keys()){
-        set_tx_gain(wbx_tx_gain_ranges[name].min, name);
+        set_tx_gain(wbx_tx_gain_ranges[name].start(), name);
     }
     BOOST_FOREACH(const std::string &name, wbx_rx_gain_ranges.keys()){
-        set_rx_gain(wbx_rx_gain_ranges[name].min, name);
+        set_rx_gain(wbx_rx_gain_ranges[name].start(), name);
     }
 }
 
@@ -198,10 +198,10 @@ wbx_xcvr::~wbx_xcvr(void){
  **********************************************************************/
 static int rx_pga0_gain_to_iobits(float &gain){
     //clip the input
-    gain = std::clip<float>(gain, wbx_rx_gain_ranges["PGA0"].min, wbx_rx_gain_ranges["PGA0"].max);
+    gain = std::clip<float>(gain, wbx_rx_gain_ranges["PGA0"].start(), wbx_rx_gain_ranges["PGA0"].stop());
 
     //convert to attenuation and update iobits for atr
-    float attn = wbx_rx_gain_ranges["PGA0"].max - gain;
+    float attn = wbx_rx_gain_ranges["PGA0"].stop() - gain;
 
     //calculate the attenuation
     int attn_code = int(floor(attn*2));
@@ -213,18 +213,18 @@ static int rx_pga0_gain_to_iobits(float &gain){
     ) % attn % attn_code % (iobits & RX_ATTN_MASK) % RX_ATTN_MASK << std::endl;
 
     //the actual gain setting
-    gain = wbx_rx_gain_ranges["PGA0"].max - float(attn_code)/2;
+    gain = wbx_rx_gain_ranges["PGA0"].stop() - float(attn_code)/2;
 
     return iobits;
 }
 
 static float tx_pga0_gain_to_dac_volts(float &gain){
     //clip the input
-    gain = std::clip<float>(gain, wbx_tx_gain_ranges["PGA0"].min, wbx_tx_gain_ranges["PGA0"].max);
+    gain = std::clip<float>(gain, wbx_tx_gain_ranges["PGA0"].start(), wbx_tx_gain_ranges["PGA0"].stop());
 
     //voltage level constants
     static const float max_volts = float(0.5), min_volts = float(1.4);
-    static const float slope = (max_volts-min_volts)/wbx_tx_gain_ranges["PGA0"].max;
+    static const float slope = (max_volts-min_volts)/wbx_tx_gain_ranges["PGA0"].stop();
 
     //calculate the voltage for the aux dac
     float dac_volts = gain*slope + min_volts;
@@ -328,7 +328,7 @@ double wbx_xcvr::set_lo_freq(
     ) % (target_freq/1e6) << std::endl;
 
     //clip the input
-    target_freq = std::clip(target_freq, wbx_freq_range.min, wbx_freq_range.max);
+    target_freq = std::clip(target_freq, wbx_freq_range.start(), wbx_freq_range.stop());
 
     //map prescaler setting to mininmum integer divider (N) values (pg.18 prescaler)
     static const uhd::dict<int, int> prescaler_to_min_int_div = map_list_of
diff --git a/host/lib/usrp/dboard/db_xcvr2450.cpp b/host/lib/usrp/dboard/db_xcvr2450.cpp
index be0e42b92..d3084b0a0 100644
--- a/host/lib/usrp/dboard/db_xcvr2450.cpp
+++ b/host/lib/usrp/dboard/db_xcvr2450.cpp
@@ -72,8 +72,10 @@ using namespace boost::assign;
  **********************************************************************/
 static const bool xcvr2450_debug = false;
 
-static const freq_range_t xcvr_freq_range(2.4e9, 6.0e9);
-static const freq_range_t xcvr_freq_band_seperation(2.5e9, 4.9e9);
+static const freq_range_t xcvr_freq_range = list_of
+    (range_t<double>(2.4e9, 2.5e9))
+    (range_t<double>(4.9e9, 6.0e9))
+;
 
 static const prop_names_t xcvr_antennas = list_of("J1")("J2");
 
@@ -212,10 +214,10 @@ xcvr2450::xcvr2450(ctor_args_t args) : xcvr_dboard_base(args){
     set_rx_ant(xcvr_antennas.at(0));
     set_tx_ant(xcvr_antennas.at(1));
     BOOST_FOREACH(const std::string &name, xcvr_tx_gain_ranges.keys()){
-        set_tx_gain(xcvr_tx_gain_ranges[name].min, name);
+        set_tx_gain(xcvr_tx_gain_ranges[name].start(), name);
     }
     BOOST_FOREACH(const std::string &name, xcvr_rx_gain_ranges.keys()){
-        set_rx_gain(xcvr_rx_gain_ranges[name].min, name);
+        set_rx_gain(xcvr_rx_gain_ranges[name].start(), name);
     }
 }
 
@@ -259,17 +261,9 @@ void xcvr2450::update_atr(void){
  * Tuning
  **********************************************************************/
 void xcvr2450::set_lo_freq(double target_freq){
-    //clip for highband and lowband
-    if((target_freq > xcvr_freq_band_seperation.min) and (target_freq < xcvr_freq_band_seperation.max)){
-        if(target_freq - xcvr_freq_band_seperation.min < xcvr_freq_band_seperation.max - target_freq){
-            target_freq = xcvr_freq_band_seperation.min;
-        }else{
-            target_freq = xcvr_freq_band_seperation.max;
-        }
-    }
 
-    //clip for max and min
-    target_freq = std::clip(target_freq, xcvr_freq_range.min, xcvr_freq_range.max);
+    //clip the input to the range (TODO FIXME not right)
+    target_freq = std::clip(target_freq, xcvr_freq_range.start(), xcvr_freq_range.stop());
 
     //variables used in the calculation below
     double scaler = xcvr2450::is_highband(target_freq)? (4.0/5.0) : (4.0/3.0);
diff --git a/host/lib/usrp/usrp1/codec_ctrl.cpp b/host/lib/usrp/usrp1/codec_ctrl.cpp
index 4aa730573..18f794632 100644
--- a/host/lib/usrp/usrp1/codec_ctrl.cpp
+++ b/host/lib/usrp/usrp1/codec_ctrl.cpp
@@ -160,19 +160,19 @@ usrp1_codec_ctrl_impl::~usrp1_codec_ctrl_impl(void)
 static const int mtpgw = 255; //maximum tx pga gain word
 
 void usrp1_codec_ctrl_impl::set_tx_pga_gain(float gain){
-    int gain_word = int(mtpgw*(gain - tx_pga_gain_range.min)/(tx_pga_gain_range.max - tx_pga_gain_range.min));
+    int gain_word = int(mtpgw*(gain - tx_pga_gain_range.start())/(tx_pga_gain_range.stop() - tx_pga_gain_range.start()));
     _ad9862_regs.tx_pga_gain = std::clip(gain_word, 0, mtpgw);
     this->send_reg(16);
 }
 
 float usrp1_codec_ctrl_impl::get_tx_pga_gain(void){
-    return (_ad9862_regs.tx_pga_gain*(tx_pga_gain_range.max - tx_pga_gain_range.min)/mtpgw) + tx_pga_gain_range.min;
+    return (_ad9862_regs.tx_pga_gain*(tx_pga_gain_range.stop() - tx_pga_gain_range.start())/mtpgw) + tx_pga_gain_range.start();
 }
 
 static const int mrpgw = 0x14; //maximum rx pga gain word
 
 void usrp1_codec_ctrl_impl::set_rx_pga_gain(float gain, char which){
-    int gain_word = int(mrpgw*(gain - rx_pga_gain_range.min)/(rx_pga_gain_range.max - rx_pga_gain_range.min));
+    int gain_word = int(mrpgw*(gain - rx_pga_gain_range.start())/(rx_pga_gain_range.stop() - rx_pga_gain_range.start()));
     gain_word = std::clip(gain_word, 0, mrpgw);
     switch(which){
     case 'A':
@@ -194,7 +194,7 @@ float usrp1_codec_ctrl_impl::get_rx_pga_gain(char which){
     case 'B': gain_word = _ad9862_regs.rx_pga_b; break;
     default: UHD_THROW_INVALID_CODE_PATH();
     }
-    return (gain_word*(rx_pga_gain_range.max - rx_pga_gain_range.min)/mrpgw) + rx_pga_gain_range.min;
+    return (gain_word*(rx_pga_gain_range.stop() - rx_pga_gain_range.start())/mrpgw) + rx_pga_gain_range.start();
 }
 
 /***********************************************************************
diff --git a/host/lib/usrp/wrapper_utils.hpp b/host/lib/usrp/wrapper_utils.hpp
index 6f9fdbfca..a7b5c5da6 100644
--- a/host/lib/usrp/wrapper_utils.hpp
+++ b/host/lib/usrp/wrapper_utils.hpp
@@ -30,7 +30,7 @@ static inline uhd::freq_range_t add_dsp_shift(
     wax::obj dsp
 ){
     double codec_rate = dsp[uhd::usrp::DSP_PROP_CODEC_RATE].as<double>();
-    return uhd::freq_range_t(range.min - codec_rate/2.0, range.max + codec_rate/2.0);
+    return uhd::freq_range_t(range.start() - codec_rate/2.0, range.stop() + codec_rate/2.0);
 }
 
 static inline void do_samp_rate_warning_message(
diff --git a/host/lib/utils/gain_group.cpp b/host/lib/utils/gain_group.cpp
index 54146726a..11bbb8c0a 100644
--- a/host/lib/utils/gain_group.cpp
+++ b/host/lib/utils/gain_group.cpp
@@ -32,7 +32,7 @@ static const bool verbose = false;
 static bool compare_by_step_size(
     const size_t &rhs, const size_t &lhs, std::vector<gain_fcns_t> &fcns
 ){
-    return fcns.at(rhs).get_range().step > fcns.at(lhs).get_range().step;
+    return fcns.at(rhs).get_range().step() > fcns.at(lhs).get_range().step();
 }
 
 /*!
@@ -69,11 +69,11 @@ public:
         float overall_min = 0, overall_max = 0, overall_step = 0;
         BOOST_FOREACH(const gain_fcns_t &fcns, get_all_fcns()){
             const gain_range_t range = fcns.get_range();
-            overall_min += range.min;
-            overall_max += range.max;
+            overall_min += range.start();
+            overall_max += range.stop();
             //the overall step is the min (zero is invalid, first run)
-            if (overall_step == 0) overall_step = range.step;
-            overall_step = std::min(overall_step, range.step);
+            if (overall_step == 0) overall_step = range.step();
+            overall_step = std::min(overall_step, range.step());
         }
         return gain_range_t(overall_min, overall_max, overall_step);
     }
@@ -97,7 +97,7 @@ public:
         //get the max step size among the gains
         float max_step = 0;
         BOOST_FOREACH(const gain_fcns_t &fcns, all_fcns){
-            max_step = std::max(max_step, fcns.get_range().step);
+            max_step = std::max(max_step, fcns.get_range().step());
         }
 
         //create gain bucket to distribute power
@@ -108,7 +108,7 @@ public:
         BOOST_FOREACH(const gain_fcns_t &fcns, all_fcns){
             const gain_range_t range = fcns.get_range();
             gain_bucket.push_back(floor_step(std::clip(
-                gain_left_to_distribute, range.min, range.max
+                gain_left_to_distribute, range.start(), range.stop()
             ), max_step));
             gain_left_to_distribute -= gain_bucket.back();
         }
@@ -123,8 +123,8 @@ public:
             boost::bind(&compare_by_step_size, _1, _2, all_fcns)
         );
         UHD_ASSERT_THROW(
-            all_fcns.at(indexes_step_size_dec.front()).get_range().step >=
-            all_fcns.at(indexes_step_size_dec.back()).get_range().step
+            all_fcns.at(indexes_step_size_dec.front()).get_range().step() >=
+            all_fcns.at(indexes_step_size_dec.back()).get_range().step()
         );
 
         //distribute the remainder (less than max step)
@@ -132,8 +132,8 @@ public:
         BOOST_FOREACH(size_t i, indexes_step_size_dec){
             const gain_range_t range = all_fcns.at(i).get_range();
             float additional_gain = floor_step(std::clip(
-                gain_bucket.at(i) + gain_left_to_distribute, range.min, range.max
-            ), range.step) - gain_bucket.at(i);
+                gain_bucket.at(i) + gain_left_to_distribute, range.start(), range.stop()
+            ), range.step()) - gain_bucket.at(i);
             gain_bucket.at(i) += additional_gain;
             gain_left_to_distribute -= additional_gain;
         }