Handle: add static is_invalid() method

2 files changed, 7 insertions, 6 deletions

diff --git a/include/winapi/handle.hpp b/include/winapi/handle.hpp
index f6f4c11..536de26 100644
--- a/include/winapi/handle.hpp
+++ b/include/winapi/handle.hpp
@@ -31,6 +31,7 @@ public:
     explicit operator HANDLE() const { return m_impl.get(); }
 
     bool is_invalid() const;
+    static bool is_invalid(HANDLE);
 
     void close();
 
diff --git a/src/handle.cpp b/src/handle.cpp
index c94cb16..fa3d8c0 100644
--- a/src/handle.cpp
+++ b/src/handle.cpp
@@ -27,10 +27,6 @@ std::runtime_error write_file_incomplete(std::size_t expected, std::size_t actua
     return std::runtime_error{oss.str()};
 }
 
-bool is_invalid_handle(HANDLE handle) {
-    return handle == NULL || handle == INVALID_HANDLE_VALUE;
-}
-
 bool is_std_handle(HANDLE handle) {
     return handle == ::GetStdHandle(STD_INPUT_HANDLE) ||
            handle == ::GetStdHandle(STD_OUTPUT_HANDLE) ||
@@ -56,7 +52,11 @@ void Handle::swap(Handle& other) BOOST_NOEXCEPT_OR_NOTHROW {
 }
 
 bool Handle::is_invalid() const {
-    return !m_impl || is_invalid_handle(m_impl.get());
+    return !m_impl || is_invalid(m_impl.get());
+}
+
+bool Handle::is_invalid(HANDLE handle) {
+    return handle == NULL || handle == INVALID_HANDLE_VALUE;
 }
 
 void Handle::close() {
@@ -143,7 +143,7 @@ void Handle::inherit(bool yes) const {
 }
 
 void Handle::Close::operator()(HANDLE impl) const {
-    if (is_invalid_handle(impl) || is_std_handle(impl))
+    if (is_invalid(impl) || is_std_handle(impl))
         return;
     const auto ret = ::CloseHandle(impl);
     assert(ret);