Add optional implementation

8 files changed, 73 insertions, 0 deletions

diff --git a/build/.gitignore b/build/.gitignore
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index 0000000..225c27f
--- /dev/null
+++ b/build/.gitignore
@@ -0,0 +1 @@
+config.build
diff --git a/build/bootstrap.build b/build/bootstrap.build
new file mode 100644
index 0000000..4dd58c5
--- /dev/null
+++ b/build/bootstrap.build
@@ -0,0 +1,6 @@
+# file      : build/bootstrap.build
+# copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+project = libbutl
+using config
diff --git a/build/export.build b/build/export.build
new file mode 100644
index 0000000..e887a6f
--- /dev/null
+++ b/build/export.build
@@ -0,0 +1,6 @@
+$out_root/:
+{
+  include butl/
+}
+
+export $out_root/butl/lib{butl}
diff --git a/build/root.build b/build/root.build
new file mode 100644
index 0000000..dc1c297
--- /dev/null
+++ b/build/root.build
@@ -0,0 +1,8 @@
+# file      : build/root.build
+# copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+using cxx
+
+cxx.std = 14
+cxx.poptions += -I$src_root
diff --git a/buildfile b/buildfile
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index 0000000..3248471
--- /dev/null
+++ b/buildfile
@@ -0,0 +1,7 @@
+# file      : buildfile
+# copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+d = butl/ tests/
+.: $d
+include $d
diff --git a/butl/buildfile b/butl/buildfile
new file mode 100644
index 0000000..5ccc75a
--- /dev/null
+++ b/butl/buildfile
@@ -0,0 +1,6 @@
+# file      : butl/buildfile
+# copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+lib{butl}: cxx{dummy}
+lib{butl}: cxx.export.poptions = -I$src_root
diff --git a/butl/dummy.cxx b/butl/dummy.cxx
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/butl/dummy.cxx
diff --git a/butl/optional b/butl/optional
new file mode 100644
index 0000000..fc34b33
--- /dev/null
+++ b/butl/optional
@@ -0,0 +1,39 @@
+// file      : butl/optional -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BUTL_OPTIONAL
+#define BUTL_OPTIONAL
+
+namespace butl
+{
+  // Simple optional class template while waiting for std::optional.
+  //
+  template <typename T>
+  class optional
+  {
+  public:
+    typedef T value_type;
+
+    optional (): null_ (true) {}
+    optional (const T& v): value_ (v), null_ (false) {}
+    optional& operator= (const T& v) {value_ = v; null_ = false; return *this;}
+
+    T&       value () {return value_;}
+    const T& value () const {return value_;}
+
+    T*       operator-> () {return &value_;}
+    const T* operator-> () const {return &value_;}
+
+    T&       operator* () {return value_;}
+    const T& operator* () const {return value_;}
+
+    explicit operator bool () const {return !null_;}
+
+  private:
+    T value_;
+    bool null_;
+  };
+}
+
+#endif // BUTL_OPTIONAL