diff --git a/include/boo/inputdev/DeviceFinder.hpp b/include/boo/inputdev/DeviceFinder.hpp
index 3acb551..ede8b11 100644
--- a/include/boo/inputdev/DeviceFinder.hpp
+++ b/include/boo/inputdev/DeviceFinder.hpp
@@ -1,13 +1,12 @@
 #pragma once
 
-#include <unordered_set>
-#include <typeindex>
+#include <memory>
 #include <mutex>
-#include "DeviceToken.hpp"
-#include "IHIDListener.hpp"
-#include "DeviceSignature.hpp"
-#include <cstring>
-#include <cstdio>
+#include <string>
+#include <unordered_set>
+#include "boo/inputdev/DeviceSignature.hpp"
+#include "boo/inputdev/DeviceToken.hpp"
+#include "boo/inputdev/IHIDListener.hpp"
 
 #ifdef _WIN32
 #ifndef WIN32_LEAN_AND_MEAN
@@ -44,28 +43,8 @@ private:
   bool _hasToken(const std::string& path) const {
     return m_tokens.find(path) != m_tokens.end();
   }
-  bool _insertToken(std::unique_ptr<DeviceToken>&& token) {
-    if (DeviceSignature::DeviceMatchToken(*token, m_types)) {
-      m_tokensLock.lock();
-      TInsertedDeviceToken inseredTok = m_tokens.insert(std::make_pair(token->getDevicePath(), std::move(token)));
-      m_tokensLock.unlock();
-      deviceConnected(*inseredTok.first->second);
-      return true;
-    }
-    return false;
-  }
-  void _removeToken(const std::string& path) {
-    auto preCheck = m_tokens.find(path);
-    if (preCheck != m_tokens.end()) {
-      DeviceToken& tok = *preCheck->second;
-      std::shared_ptr<DeviceBase> dev = tok.m_connectedDev;
-      tok._deviceClose();
-      deviceDisconnected(tok, dev.get());
-      m_tokensLock.lock();
-      m_tokens.erase(preCheck);
-      m_tokensLock.unlock();
-    }
-  }
+  bool _insertToken(std::unique_ptr<DeviceToken>&& token);
+  void _removeToken(const std::string& path);
 
 public:
   class CDeviceTokensHandle {
@@ -83,26 +62,8 @@ public:
   };
 
   /* Application must specify its interested device-types */
-  DeviceFinder(std::unordered_set<uint64_t> types) {
-    if (skDevFinder) {
-      fmt::print(stderr, fmt("only one instance of CDeviceFinder may be constructed"));
-      abort();
-    }
-    skDevFinder = this;
-    for (const uint64_t& typeHash : types) {
-      const DeviceSignature* sigIter = BOO_DEVICE_SIGS;
-      while (sigIter->m_name) {
-        if (sigIter->m_typeHash == typeHash)
-          m_types.push_back(sigIter);
-        ++sigIter;
-      }
-    }
-  }
-  virtual ~DeviceFinder() {
-    if (m_listener)
-      m_listener->stopScanning();
-    skDevFinder = NULL;
-  }
+  DeviceFinder(std::unordered_set<uint64_t> types);
+  virtual ~DeviceFinder();
 
   /* Get interested device-type mask */
   const DeviceSignature::TDeviceSignatureSet& getTypes() const { return m_types; }
@@ -111,29 +72,11 @@ public:
   CDeviceTokensHandle getTokens() { return CDeviceTokensHandle(*this); }
 
   /* Automatic device scanning */
-  bool startScanning() {
-    if (!m_listener)
-      m_listener = IHIDListenerNew(*this);
-    if (m_listener)
-      return m_listener->startScanning();
-    return false;
-  }
-  bool stopScanning() {
-    if (!m_listener)
-      m_listener = IHIDListenerNew(*this);
-    if (m_listener)
-      return m_listener->stopScanning();
-    return false;
-  }
+  bool startScanning();
+  bool stopScanning();
 
   /* Manual device scanning */
-  bool scanNow() {
-    if (!m_listener)
-      m_listener = IHIDListenerNew(*this);
-    if (m_listener)
-      return m_listener->scanNow();
-    return false;
-  }
+  bool scanNow();
 
   virtual void deviceConnected(DeviceToken&) {}
   virtual void deviceDisconnected(DeviceToken&, DeviceBase*) {}
diff --git a/lib/inputdev/DeviceFinder.cpp b/lib/inputdev/DeviceFinder.cpp
index 3d0889a..e1d9c03 100644
--- a/lib/inputdev/DeviceFinder.cpp
+++ b/lib/inputdev/DeviceFinder.cpp
@@ -1,5 +1,8 @@
 #include "boo/inputdev/DeviceFinder.hpp"
 
+#include <cstdio>
+#include <cstdlib>
+
 #if _WIN32
 #include <Dbt.h>
 #include <hidclass.h>
@@ -10,6 +13,76 @@ namespace boo {
 
 DeviceFinder* DeviceFinder::skDevFinder = nullptr;
 
+DeviceFinder::DeviceFinder(std::unordered_set<uint64_t> types) {
+  if (skDevFinder) {
+    fmt::print(stderr, fmt("only one instance of CDeviceFinder may be constructed"));
+    std::abort();
+  }
+  skDevFinder = this;
+  for (const uint64_t& typeHash : types) {
+    const DeviceSignature* sigIter = BOO_DEVICE_SIGS;
+    while (sigIter->m_name) {
+      if (sigIter->m_typeHash == typeHash)
+        m_types.push_back(sigIter);
+      ++sigIter;
+    }
+  }
+}
+
+DeviceFinder::~DeviceFinder() {
+  if (m_listener)
+    m_listener->stopScanning();
+  skDevFinder = nullptr;
+}
+
+bool DeviceFinder::_insertToken(std::unique_ptr<DeviceToken>&& token) {
+  if (DeviceSignature::DeviceMatchToken(*token, m_types)) {
+    m_tokensLock.lock();
+    TInsertedDeviceToken insertedTok = m_tokens.insert(std::make_pair(token->getDevicePath(), std::move(token)));
+    m_tokensLock.unlock();
+    deviceConnected(*insertedTok.first->second);
+    return true;
+  }
+  return false;
+}
+
+void DeviceFinder::_removeToken(const std::string& path) {
+  auto preCheck = m_tokens.find(path);
+  if (preCheck != m_tokens.end()) {
+    DeviceToken& tok = *preCheck->second;
+    std::shared_ptr<DeviceBase> dev = tok.m_connectedDev;
+    tok._deviceClose();
+    deviceDisconnected(tok, dev.get());
+    m_tokensLock.lock();
+    m_tokens.erase(preCheck);
+    m_tokensLock.unlock();
+  }
+}
+
+bool DeviceFinder::startScanning() {
+  if (!m_listener)
+    m_listener = IHIDListenerNew(*this);
+  if (m_listener)
+    return m_listener->startScanning();
+  return false;
+}
+
+bool DeviceFinder::stopScanning() {
+  if (!m_listener)
+    m_listener = IHIDListenerNew(*this);
+  if (m_listener)
+    return m_listener->stopScanning();
+  return false;
+}
+
+bool DeviceFinder::scanNow() {
+  if (!m_listener)
+    m_listener = IHIDListenerNew(*this);
+  if (m_listener)
+    return m_listener->scanNow();
+  return false;
+}
+
 #if _WIN32 && !WINDOWS_STORE
 /* Windows-specific WM_DEVICECHANGED handler */
 LRESULT DeviceFinder::winDevChangedHandler(WPARAM wParam, LPARAM lParam) {