Only enable std::optional if compiling in >= C++14 (#476)

12edaaa6 · Jason Rhinelander · Wenzel Jakob · 44a69f78 · 12edaaa6
Commit 12edaaa6 authored Nov 03, 2016 by Jason Rhinelander Committed by Wenzel Jakob Nov 03, 2016
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include/pybind11/stl.h
+1 -1

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--- a/include/pybind11/stl.h
+++ b/include/pybind11/stl.h
@@ -22,7 +22,7 @@
 #pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
 #endif

-#ifdef __has_include
+#if defined(PYBIND11_CPP14) && defined(__has_include)
 // std::optional
 #  if __has_include(<optional>)
 #    include <optional>