Added Sci::make_unique() and Sci::size() for better compatibility with the default branch.

std::make_unique() is c++14 and std::size() is c++17.

1 files changed, 51 insertions, 0 deletions

diff --git a/include/Compat.h b/include/Compat.h
new file mode 100644
index 000000000..712ff1373
--- /dev/null
+++ b/include/Compat.h
@@ -0,0 +1,51 @@
+// c++11 compatibility with some c++14 features and higher.
+// This helps minimize changes from the default branch.
+
+#ifndef COMPAT_H
+#define COMPAT_H
+
+#ifdef __cplusplus
+
+#include <cstddef>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+namespace Sci {
+
+// std::make_unique
+template<class T> struct _Unique_if {
+  typedef std::unique_ptr<T> _Single_object;
+};
+template<class T> struct _Unique_if<T[]> {
+  typedef std::unique_ptr<T[]> _Unknown_bound;
+};
+template<class T, size_t N> struct _Unique_if<T[N]> {
+  typedef void _Known_bound;
+};
+template<class T, class... Args>
+  typename _Unique_if<T>::_Single_object
+  make_unique(Args&&... args) {
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+  }
+template<class T>
+  typename _Unique_if<T>::_Unknown_bound
+  make_unique(size_t n) {
+    typedef typename std::remove_extent<T>::type U;
+    return std::unique_ptr<T>(new U[n]());
+  }
+template<class T, class... Args>
+  typename _Unique_if<T>::_Known_bound
+  make_unique(Args&&...) = delete;
+  
+// std::size
+template <typename T, size_t N>
+constexpr size_t size(const T (&)[N]) noexcept {
+  return N;
+}
+
+}
+
+#endif
+
+#endif
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