Remove Lazy

This fixes a crash during startup when compiling Nix as a single
compilation unit.

1 files changed, 0 insertions, 48 deletions

diff --git a/src/libutil/lazy.hh b/src/libutil/lazy.hh
deleted file mode 100644
index d073e486c..000000000
--- a/src/libutil/lazy.hh
+++ /dev/null
@@ -1,48 +0,0 @@
-#include <exception>
-#include <functional>
-#include <mutex>
-
-namespace nix {
-
-/* A helper class for lazily-initialized variables.
-
-     Lazy<T> var([]() { return value; });
-
-   declares a variable of type T that is initialized to 'value' (in a
-   thread-safe way) on first use, that is, when var() is first
-   called. If the initialiser code throws an exception, then all
-   subsequent calls to var() will rethrow that exception. */
-template<typename T>
-class Lazy
-{
-
-    typedef std::function<T()> Init;
-
-    Init init;
-
-    std::once_flag done;
-
-    T value;
-
-    std::exception_ptr ex;
-
-public:
-
-    Lazy(Init init) : init(init)
-    { }
-
-    const T & operator () ()
-    {
-        std::call_once(done, [&]() {
-            try {
-                value = init();
-            } catch (...) {
-                ex = std::current_exception();
-            }
-        });
-        if (ex) std::rethrow_exception(ex);
-        return value;
-    }
-};
-
-}