uhd: replaced boost filesystem path with fs_path in property tree

9 files changed, 102 insertions, 58 deletions

diff --git a/host/lib/property_tree.cpp b/host/lib/property_tree.cpp
index 58cd3f6ea..50e82a6ba 100644
--- a/host/lib/property_tree.cpp
+++ b/host/lib/property_tree.cpp
@@ -22,17 +22,63 @@
 #include <boost/make_shared.hpp>
 #include <iostream>
 
+using namespace uhd;
+
+/***********************************************************************
+ * Helper function to iterate through paths
+ **********************************************************************/
+#include <boost/tokenizer.hpp>
+#define path_tokenizer(path) \
+    boost::tokenizer<boost::char_separator<char> > \
+    (path, boost::char_separator<char>("/"))
+
+/***********************************************************************
+ * Property path implementation wrapper
+ **********************************************************************/
+fs_path::fs_path(void): std::string(){}
+fs_path::fs_path(const char *p): std::string(p){}
+fs_path::fs_path(const std::string &p): std::string(p){}
+
+std::string fs_path::leaf(void) const{
+    const size_t pos = this->rfind("/");
+    if (pos == std::string::npos) return *this;
+    return this->substr(pos+1);
+}
+
+fs_path fs_path::branch_path(void) const{
+    const size_t pos = this->rfind("/");
+    if (pos == std::string::npos) return *this;
+    return fs_path(this->substr(0, pos));
+}
+
+fs_path uhd::operator/(const fs_path &lhs, const fs_path &rhs){
+    //strip trailing slash on left-hand-side
+    if (not lhs.empty() and *lhs.rbegin() == '/'){
+        return fs_path(lhs.substr(0, lhs.size()-1)) / rhs;
+    }
+
+    //strip leading slash on right-hand-side
+    if (not rhs.empty() and *rhs.begin() == '/'){
+        return lhs / fs_path(rhs.substr(1));
+    }
+
+    return fs_path(lhs + "/" + rhs);
+}
+
+/***********************************************************************
+ * Property tree implementation
+ **********************************************************************/
 class property_tree_impl : public uhd::property_tree{
 public:
 
-    property_tree_impl(const path_type &root = path_type()):
+    property_tree_impl(const fs_path &root = fs_path()):
         _root(root)
     {
         _guts = boost::make_shared<tree_guts_type>();
     }
 
-    sptr subtree(const path_type &path_) const{
-        const path_type path = _root / path_;
+    sptr subtree(const fs_path &path_) const{
+        const fs_path path = _root / path_;
         boost::mutex::scoped_lock lock(_guts->mutex);
 
         property_tree_impl *subtree = new property_tree_impl(path);
@@ -40,42 +86,39 @@ public:
         return sptr(subtree);
     }
 
-    void remove(const path_type &path_){
-        const path_type path = _root / path_;
+    void remove(const fs_path &path_){
+        const fs_path path = _root / path_;
         boost::mutex::scoped_lock lock(_guts->mutex);
 
         node_type *parent = NULL;
         node_type *node = &_guts->root;
-        BOOST_FOREACH(const path_type &branch, path){
-            const std::string name = branch.string();
+        BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
             if (not node->has_key(name)) throw_path_not_found(path);
             parent = node;
             node = &(*node)[name];
         }
         if (parent == NULL) throw uhd::runtime_error("Cannot uproot");
-        parent->pop(path_type(path.leaf()).string());
+        parent->pop(fs_path(path.leaf()));
     }
 
-    bool exists(const path_type &path_) const{
-        const path_type path = _root / path_;
+    bool exists(const fs_path &path_) const{
+        const fs_path path = _root / path_;
         boost::mutex::scoped_lock lock(_guts->mutex);
 
         node_type *node = &_guts->root;
-        BOOST_FOREACH(const path_type &branch, path){
-            const std::string name = branch.string();
+        BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
             if (not node->has_key(name)) return false;
             node = &(*node)[name];
         }
         return true;
     }
 
-    std::vector<std::string> list(const path_type &path_) const{
-        const path_type path = _root / path_;
+    std::vector<std::string> list(const fs_path &path_) const{
+        const fs_path path = _root / path_;
         boost::mutex::scoped_lock lock(_guts->mutex);
 
         node_type *node = &_guts->root;
-        BOOST_FOREACH(const path_type &branch, path){
-            const std::string name = branch.string();
+        BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
             if (not node->has_key(name)) throw_path_not_found(path);
             node = &(*node)[name];
         }
@@ -83,37 +126,35 @@ public:
         return node->keys();
     }
 
-    void _create(const path_type &path_, const boost::shared_ptr<void> &prop){
-        const path_type path = _root / path_;
+    void _create(const fs_path &path_, const boost::shared_ptr<void> &prop){
+        const fs_path path = _root / path_;
         boost::mutex::scoped_lock lock(_guts->mutex);
 
         node_type *node = &_guts->root;
-        BOOST_FOREACH(const path_type &branch, path){
-            const std::string name = branch.string();
+        BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
             if (not node->has_key(name)) (*node)[name] = node_type();
             node = &(*node)[name];
         }
-        if (node->prop.get() != NULL) throw uhd::runtime_error("Cannot create! Property already exists at: " + path.string());
+        if (node->prop.get() != NULL) throw uhd::runtime_error("Cannot create! Property already exists at: " + path);
         node->prop = prop;
     }
 
-    boost::shared_ptr<void> &_access(const path_type &path_) const{
-        const path_type path = _root / path_;
+    boost::shared_ptr<void> &_access(const fs_path &path_) const{
+        const fs_path path = _root / path_;
         boost::mutex::scoped_lock lock(_guts->mutex);
 
         node_type *node = &_guts->root;
-        BOOST_FOREACH(const path_type &branch, path){
-            const std::string name = branch.string();
+        BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
             if (not node->has_key(name)) throw_path_not_found(path);
             node = &(*node)[name];
         }
-        if (node->prop.get() == NULL) throw uhd::runtime_error("Cannot access! Property uninitialized at: " + path.string());
+        if (node->prop.get() == NULL) throw uhd::runtime_error("Cannot access! Property uninitialized at: " + path);
         return node->prop;
     }
 
 private:
-    void throw_path_not_found(const path_type &path) const{
-        throw uhd::lookup_error("Path not found in tree: " + path.string());
+    void throw_path_not_found(const fs_path &path) const{
+        throw uhd::lookup_error("Path not found in tree: " + path);
     }
 
     //basic structural node element
@@ -129,9 +170,12 @@ private:
 
     //members, the tree and root prefix
     boost::shared_ptr<tree_guts_type> _guts;
-    const path_type _root;
+    const fs_path _root;
 };
 
+/***********************************************************************
+ * Property tree factory
+ **********************************************************************/
 uhd::property_tree::sptr uhd::property_tree::make(void){
     return sptr(new property_tree_impl());
 }
diff --git a/host/lib/usrp/b100/b100_impl.cpp b/host/lib/usrp/b100/b100_impl.cpp
index 2e2421ed3..ea9c91c50 100644
--- a/host/lib/usrp/b100/b100_impl.cpp
+++ b/host/lib/usrp/b100/b100_impl.cpp
@@ -209,7 +209,7 @@ b100_impl::b100_impl(const device_addr_t &device_addr){
     ////////////////////////////////////////////////////////////////////
     _tree = property_tree::make();
     _tree->create<std::string>("/name").set("B-Series Device");
-    const property_tree::path_type mb_path = "/mboards/0";
+    const fs_path mb_path = "/mboards/0";
     _tree->create<std::string>(mb_path / "name").set("B100 (B-Hundo)");
     _tree->create<std::string>(mb_path / "load_eeprom")
         .subscribe(boost::bind(&fx2_ctrl::usrp_load_eeprom, _fx2_ctrl, _1));
@@ -234,8 +234,8 @@ b100_impl::b100_impl(const device_addr_t &device_addr){
     // create codec control objects
     ////////////////////////////////////////////////////////////////////
     _codec_ctrl = b100_codec_ctrl::make(_fpga_spi_ctrl);
-    const property_tree::path_type rx_codec_path = mb_path / "rx_codecs/A";
-    const property_tree::path_type tx_codec_path = mb_path / "tx_codecs/A";
+    const fs_path rx_codec_path = mb_path / "rx_codecs/A";
+    const fs_path tx_codec_path = mb_path / "tx_codecs/A";
     _tree->create<std::string>(rx_codec_path / "name").set("ad9522");
     _tree->create<meta_range_t>(rx_codec_path / "gains/pga/range").set(b100_codec_ctrl::rx_pga_gain_range);
     _tree->create<double>(rx_codec_path / "gains/pga/value")
@@ -276,7 +276,7 @@ b100_impl::b100_impl(const device_addr_t &device_addr){
         _rx_dsps[dspno]->set_link_rate(B100_LINK_RATE_BPS);
         _tree->access<double>(mb_path / "tick_rate")
             .subscribe(boost::bind(&rx_dsp_core_200::set_tick_rate, _rx_dsps[dspno], _1));
-        property_tree::path_type rx_dsp_path = mb_path / str(boost::format("rx_dsps/%u") % dspno);
+        fs_path rx_dsp_path = mb_path / str(boost::format("rx_dsps/%u") % dspno);
         _tree->create<double>(rx_dsp_path / "rate/value")
             .coerce(boost::bind(&rx_dsp_core_200::set_host_rate, _rx_dsps[dspno], _1))
             .subscribe(boost::bind(&b100_impl::update_rx_samp_rate, this, _1));
diff --git a/host/lib/usrp/b100/io_impl.cpp b/host/lib/usrp/b100/io_impl.cpp
index d841188c0..34535217a 100644
--- a/host/lib/usrp/b100/io_impl.cpp
+++ b/host/lib/usrp/b100/io_impl.cpp
@@ -140,7 +140,7 @@ void b100_impl::update_tx_samp_rate(const double rate){
 
 void b100_impl::update_rx_subdev_spec(const uhd::usrp::subdev_spec_t &spec){
     boost::mutex::scoped_lock recv_lock = _io_impl->recv_handler.get_scoped_lock();
-    property_tree::path_type root = "/mboards/0/dboards";
+    fs_path root = "/mboards/0/dboards";
 
     //sanity checking
     validate_subdev_spec(_tree, spec, "rx");
@@ -169,7 +169,7 @@ void b100_impl::update_rx_subdev_spec(const uhd::usrp::subdev_spec_t &spec){
 
 void b100_impl::update_tx_subdev_spec(const uhd::usrp::subdev_spec_t &spec){
     boost::mutex::scoped_lock send_lock = _io_impl->send_handler.get_scoped_lock();
-    property_tree::path_type root = "/mboards/0/dboards";
+    fs_path root = "/mboards/0/dboards";
 
     //sanity checking
     validate_subdev_spec(_tree, spec, "tx");
diff --git a/host/lib/usrp/e100/e100_impl.cpp b/host/lib/usrp/e100/e100_impl.cpp
index cca4ee9b3..0defb2973 100644
--- a/host/lib/usrp/e100/e100_impl.cpp
+++ b/host/lib/usrp/e100/e100_impl.cpp
@@ -170,7 +170,7 @@ e100_impl::e100_impl(const uhd::device_addr_t &device_addr){
     ////////////////////////////////////////////////////////////////////
     _tree = property_tree::make();
     _tree->create<std::string>("/name").set("E-Series Device");
-    const property_tree::path_type mb_path = "/mboards/0";
+    const fs_path mb_path = "/mboards/0";
     _tree->create<std::string>(mb_path / "name").set("E100 (euewanee)");
 
     ////////////////////////////////////////////////////////////////////
@@ -193,8 +193,8 @@ e100_impl::e100_impl(const uhd::device_addr_t &device_addr){
     // create codec control objects
     ////////////////////////////////////////////////////////////////////
     _codec_ctrl = e100_codec_ctrl::make(_fpga_spi_ctrl);
-    const property_tree::path_type rx_codec_path = mb_path / "rx_codecs/A";
-    const property_tree::path_type tx_codec_path = mb_path / "tx_codecs/A";
+    const fs_path rx_codec_path = mb_path / "rx_codecs/A";
+    const fs_path tx_codec_path = mb_path / "tx_codecs/A";
     _tree->create<std::string>(rx_codec_path / "name").set("ad9522");
     _tree->create<meta_range_t>(rx_codec_path / "gains/pga/range").set(e100_codec_ctrl::rx_pga_gain_range);
     _tree->create<double>(rx_codec_path / "gains/pga/value")
@@ -235,7 +235,7 @@ e100_impl::e100_impl(const uhd::device_addr_t &device_addr){
         _rx_dsps[dspno]->set_link_rate(E100_LINK_RATE_BPS);
         _tree->access<double>(mb_path / "tick_rate")
             .subscribe(boost::bind(&rx_dsp_core_200::set_tick_rate, _rx_dsps[dspno], _1));
-        property_tree::path_type rx_dsp_path = mb_path / str(boost::format("rx_dsps/%u") % dspno);
+        fs_path rx_dsp_path = mb_path / str(boost::format("rx_dsps/%u") % dspno);
         _tree->create<double>(rx_dsp_path / "rate/value")
             .coerce(boost::bind(&rx_dsp_core_200::set_host_rate, _rx_dsps[dspno], _1))
             .subscribe(boost::bind(&e100_impl::update_rx_samp_rate, this, _1));
diff --git a/host/lib/usrp/e100/io_impl.cpp b/host/lib/usrp/e100/io_impl.cpp
index a10b3ffb3..0b81c1a86 100644
--- a/host/lib/usrp/e100/io_impl.cpp
+++ b/host/lib/usrp/e100/io_impl.cpp
@@ -218,7 +218,7 @@ void e100_impl::update_tx_samp_rate(const double rate){
 
 void e100_impl::update_rx_subdev_spec(const uhd::usrp::subdev_spec_t &spec){
     boost::mutex::scoped_lock recv_lock = _io_impl->recv_handler.get_scoped_lock();
-    property_tree::path_type root = "/mboards/0/dboards";
+    fs_path root = "/mboards/0/dboards";
 
     //sanity checking
     validate_subdev_spec(_tree, spec, "rx");
@@ -247,7 +247,7 @@ void e100_impl::update_rx_subdev_spec(const uhd::usrp::subdev_spec_t &spec){
 
 void e100_impl::update_tx_subdev_spec(const uhd::usrp::subdev_spec_t &spec){
     boost::mutex::scoped_lock send_lock = _io_impl->send_handler.get_scoped_lock();
-    property_tree::path_type root = "/mboards/0/dboards";
+    fs_path root = "/mboards/0/dboards";
 
     //sanity checking
     validate_subdev_spec(_tree, spec, "tx");
diff --git a/host/lib/usrp/multi_usrp.cpp b/host/lib/usrp/multi_usrp.cpp
index f9f5e675f..49cbe522f 100644
--- a/host/lib/usrp/multi_usrp.cpp
+++ b/host/lib/usrp/multi_usrp.cpp
@@ -634,30 +634,30 @@ private:
         return mcp;
     }
 
-    property_tree::path_type mb_root(const size_t mboard){
+    fs_path mb_root(const size_t mboard){
         const std::string name = _tree->list("/mboards").at(mboard);
         return "/mboards/" + name;
     }
 
-    property_tree::path_type rx_dsp_root(const size_t chan){
+    fs_path rx_dsp_root(const size_t chan){
         mboard_chan_pair mcp = rx_chan_to_mcp(chan);
         const std::string name = _tree->list(mb_root(mcp.mboard) / "rx_dsps").at(mcp.chan);
         return mb_root(mcp.mboard) / "rx_dsps" / name;
     }
 
-    property_tree::path_type tx_dsp_root(const size_t chan){
+    fs_path tx_dsp_root(const size_t chan){
         mboard_chan_pair mcp = tx_chan_to_mcp(chan);
         const std::string name = _tree->list(mb_root(mcp.mboard) / "tx_dsps").at(mcp.chan);
         return mb_root(mcp.mboard) / "tx_dsps" / name;
     }
 
-    property_tree::path_type rx_rf_fe_root(const size_t chan){
+    fs_path rx_rf_fe_root(const size_t chan){
         mboard_chan_pair mcp = rx_chan_to_mcp(chan);
         const subdev_spec_pair_t spec = get_rx_subdev_spec(mcp.mboard).at(mcp.chan);
         return mb_root(mcp.mboard) / "dboards" / spec.db_name / "rx_frontends" / spec.sd_name;
     }
 
-    property_tree::path_type tx_rf_fe_root(const size_t chan){
+    fs_path tx_rf_fe_root(const size_t chan){
         mboard_chan_pair mcp = tx_chan_to_mcp(chan);
         const subdev_spec_pair_t spec = get_tx_subdev_spec(mcp.mboard).at(mcp.chan);
         return mb_root(mcp.mboard) / "dboards" / spec.db_name / "tx_frontends" / spec.sd_name;
diff --git a/host/lib/usrp/usrp1/usrp1_impl.cpp b/host/lib/usrp/usrp1/usrp1_impl.cpp
index 7a8f6497c..7c9e61e94 100644
--- a/host/lib/usrp/usrp1/usrp1_impl.cpp
+++ b/host/lib/usrp/usrp1/usrp1_impl.cpp
@@ -208,7 +208,7 @@ usrp1_impl::usrp1_impl(const device_addr_t &device_addr){
     ////////////////////////////////////////////////////////////////////
     _tree = property_tree::make();
     _tree->create<std::string>("/name").set("USRP1 Device");
-    const property_tree::path_type mb_path = "/mboards/0";
+    const fs_path mb_path = "/mboards/0";
     _tree->create<std::string>(mb_path / "name").set("USRP1 (Classic)");
     _tree->create<std::string>(mb_path / "load_eeprom")
         .subscribe(boost::bind(&fx2_ctrl::usrp_load_eeprom, _fx2_ctrl, _1));
@@ -239,8 +239,8 @@ usrp1_impl::usrp1_impl(const device_addr_t &device_addr){
     ////////////////////////////////////////////////////////////////////
     BOOST_FOREACH(const std::string &db, _dbc.keys()){
         _dbc[db].codec = usrp1_codec_ctrl::make(_iface, (db == "A")? SPI_ENABLE_CODEC_A : SPI_ENABLE_CODEC_B);
-        const property_tree::path_type rx_codec_path = mb_path / "rx_codecs" / db;
-        const property_tree::path_type tx_codec_path = mb_path / "tx_codecs" / db;
+        const fs_path rx_codec_path = mb_path / "rx_codecs" / db;
+        const fs_path tx_codec_path = mb_path / "tx_codecs" / db;
         _tree->create<std::string>(rx_codec_path / "name").set("ad9522");
         _tree->create<meta_range_t>(rx_codec_path / "gains/pga/range").set(usrp1_codec_ctrl::rx_pga_gain_range);
         _tree->create<double>(rx_codec_path / "gains/pga/value")
@@ -270,7 +270,7 @@ usrp1_impl::usrp1_impl(const device_addr_t &device_addr){
     // create rx dsp control objects
     ////////////////////////////////////////////////////////////////////
     for (size_t dspno = 0; dspno < get_num_ddcs(); dspno++){
-        property_tree::path_type rx_dsp_path = mb_path / str(boost::format("rx_dsps/%u") % dspno);
+        fs_path rx_dsp_path = mb_path / str(boost::format("rx_dsps/%u") % dspno);
         _tree->create<double>(rx_dsp_path / "rate/value")
             .coerce(boost::bind(&usrp1_impl::update_rx_samp_rate, this, _1));
         _tree->create<double>(rx_dsp_path / "freq/value")
@@ -289,7 +289,7 @@ usrp1_impl::usrp1_impl(const device_addr_t &device_addr){
     // create tx dsp control objects
     ////////////////////////////////////////////////////////////////////
     for (size_t dspno = 0; dspno < get_num_ducs(); dspno++){
-        property_tree::path_type tx_dsp_path = mb_path / str(boost::format("tx_dsps/%u") % dspno);
+        fs_path tx_dsp_path = mb_path / str(boost::format("tx_dsps/%u") % dspno);
         _tree->create<double>(tx_dsp_path / "rate/value")
             .coerce(boost::bind(&usrp1_impl::update_tx_samp_rate, this, _1));
         _tree->create<double>(tx_dsp_path / "freq/value")
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index 67bf25c2b..aef3f3a39 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -316,7 +316,7 @@ static subdev_spec_t replace_zero_in_spec(const std::string &type, const subdev_
 subdev_spec_t usrp2_impl::update_rx_subdev_spec(const std::string &which_mb, const subdev_spec_t &spec_){
     const subdev_spec_t spec = replace_zero_in_spec("RX", spec_);
     boost::mutex::scoped_lock recv_lock = _io_impl->recv_handler.get_scoped_lock();
-    property_tree::path_type root = "/mboards/" + which_mb + "/dboards";
+    fs_path root = "/mboards/" + which_mb + "/dboards";
 
     //sanity checking
     validate_subdev_spec(_tree, spec, "rx", which_mb);
@@ -352,7 +352,7 @@ subdev_spec_t usrp2_impl::update_rx_subdev_spec(const std::string &which_mb, con
 subdev_spec_t usrp2_impl::update_tx_subdev_spec(const std::string &which_mb, const subdev_spec_t &spec_){
     const subdev_spec_t spec = replace_zero_in_spec("TX", spec_);
     boost::mutex::scoped_lock send_lock = _io_impl->send_handler.get_scoped_lock();
-    property_tree::path_type root = "/mboards/" + which_mb + "/dboards";
+    fs_path root = "/mboards/" + which_mb + "/dboards";
 
     //sanity checking
     validate_subdev_spec(_tree, spec, "tx", which_mb);
diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp
index 9a8269e6f..f87eb067e 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.cpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.cpp
@@ -328,7 +328,7 @@ usrp2_impl::usrp2_impl(const device_addr_t &_device_addr){
         const device_addr_t device_args_i = device_args[mbi];
         const std::string mb = boost::lexical_cast<std::string>(mbi);
         const std::string addr = device_args_i["addr"];
-        const property_tree::path_type mb_path = "/mboards/" + mb;
+        const fs_path mb_path = "/mboards/" + mb;
 
         ////////////////////////////////////////////////////////////////
         // create the iface that controls i2c, spi, uart, and wb
@@ -395,8 +395,8 @@ usrp2_impl::usrp2_impl(const device_addr_t &_device_addr){
         ////////////////////////////////////////////////////////////////
         // create codec control objects
         ////////////////////////////////////////////////////////////////
-        const property_tree::path_type rx_codec_path = mb_path / "rx_codecs/A";
-        const property_tree::path_type tx_codec_path = mb_path / "tx_codecs/A";
+        const fs_path rx_codec_path = mb_path / "rx_codecs/A";
+        const fs_path tx_codec_path = mb_path / "tx_codecs/A";
         _tree->create<int>(rx_codec_path / "gains"); //phony property so this dir exists
         _tree->create<int>(tx_codec_path / "gains"); //phony property so this dir exists
         _mbc[mb].codec = usrp2_codec_ctrl::make(_mbc[mb].iface);
@@ -479,7 +479,7 @@ usrp2_impl::usrp2_impl(const device_addr_t &_device_addr){
             //The dsp core starts streaming briefly... now we flush
             _mbc[mb].rx_dsp_xports[dspno]->get_recv_buff(0.01).get(); //recv with timeout for lingering
             _mbc[mb].rx_dsp_xports[dspno]->get_recv_buff(0.01).get(); //recv with timeout for expected
-            property_tree::path_type rx_dsp_path = mb_path / str(boost::format("rx_dsps/%u") % dspno);
+            fs_path rx_dsp_path = mb_path / str(boost::format("rx_dsps/%u") % dspno);
             _tree->create<double>(rx_dsp_path / "rate/value")
                 .coerce(boost::bind(&rx_dsp_core_200::set_host_rate, _mbc[mb].rx_dsps[dspno], _1))
                 .subscribe(boost::bind(&usrp2_impl::update_rx_samp_rate, this, _1));
@@ -595,7 +595,7 @@ usrp2_impl::usrp2_impl(const device_addr_t &_device_addr){
 
     //do some post-init tasks
     BOOST_FOREACH(const std::string &mb, _mbc.keys()){
-        property_tree::path_type root = "/mboards/" + mb;
+        fs_path root = "/mboards/" + mb;
         _tree->access<double>(root / "tick_rate").update();
 
         //and now that the tick rate is set, init the host rates to something