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Only enable std::optional if compiling in >= C++14 (#476)
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@ -22,7 +22,7 @@
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#pragma warning(disable: 4127) // warning C4127: Conditional expression is constant
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#endif
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#ifdef __has_include
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#if defined(PYBIND11_CPP14) && defined(__has_include)
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// std::optional
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# if __has_include(<optional>)
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# include <optional>
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