mirror of
https://github.com/CLIUtils/CLI11.git
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87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
#pragma once
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// Distributed under the 3-Clause BSD License. See accompanying
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// file LICENSE or https://github.com/CLIUtils/CLI11 for details.
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#include <istream>
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#include "CLI/Macros.hpp"
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// [CLI11:verbatim]
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#ifdef __has_include
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#if defined(CLI11_CPP17) && __has_include(<optional>) && \
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defined(__cpp_lib_optional) && !defined(CLI11_STD_OPTIONAL)
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#define CLI11_STD_OPTIONAL 1
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#endif
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#if defined(CLI11_CPP14) && __has_include(<experimental/optional>) && \
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!defined(CLI11_EXPERIMENTAL_OPTIONAL)
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#define CLI11_EXPERIMENTAL_OPTIONAL 1
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#endif
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#if __has_include(<boost/optional.hpp>) && !defined(CLI11_BOOST_OPTIONAL)
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#include <boost/version.hpp>
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#if BOOST_VERSION >= 105800
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#define CLI11_BOOST_OPTIONAL 1
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#endif
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#endif
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#endif
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#if CLI11_STD_OPTIONAL
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#include <optional>
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#endif
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#if CLI11_EXPERIMENTAL_OPTIONAL
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#include <experimental/optional>
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#endif
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#if CLI11_BOOST_OPTIONAL
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#include <boost/optional.hpp>
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#endif
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// [CLI11:verbatim]
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namespace CLI {
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#if CLI11_STD_OPTIONAL
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template <typename T> std::istream &operator>>(std::istream &in, std::optional<T> &val) {
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T v;
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in >> v;
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val = v;
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return in;
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}
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#endif
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#if CLI11_EXPERIMENTAL_OPTIONAL
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template <typename T> std::istream &operator>>(std::istream &in, std::experimental::optional<T> &val) {
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T v;
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in >> v;
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val = v;
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return in;
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}
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#endif
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#if CLI11_BOOST_OPTIONAL
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template <typename T> std::istream &operator>>(std::istream &in, boost::optional<T> &val) {
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T v;
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in >> v;
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val = v;
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return in;
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}
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#endif
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// Export the best optional to the CLI namespace
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#if CLI11_STD_OPTIONAL
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using std::optional;
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#elif CLI11_EXPERIMENTAL_OPTIONAL
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using std::experimental::optional;
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#elif CLI11_BOOST_OPTIONAL
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using boost::optional;
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#endif
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// This is true if any optional is found
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#if CLI11_STD_OPTIONAL || CLI11_EXPERIMENTAL_OPTIONAL || CLI11_BOOST_OPTIONAL
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#define CLI11_OPTIONAL 1
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#endif
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} // namespace CLI
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