mirror of
https://github.com/CLIUtils/CLI11.git
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98 lines
2.1 KiB
C++
98 lines
2.1 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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// You can explicitly enable or disable support
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// by defining to 1 or 0. Extra check here to ensure it's in the stdlib too.
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// We nest the check for __has_include and it's usage
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#ifndef CLI11_STD_OPTIONAL
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#ifdef __has_include
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#if defined(CLI11_CPP17) && __has_include(<optional>)
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#define CLI11_STD_OPTIONAL 1
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#else
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#define CLI11_STD_OPTIONAL 0
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#endif
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#else
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#define CLI11_STD_OPTIONAL 0
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#endif
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#endif
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#ifndef CLI11_EXPERIMENTAL_OPTIONAL
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#define CLI11_EXPERIMENTAL_OPTIONAL 0
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#endif
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#ifndef CLI11_BOOST_OPTIONAL
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#define CLI11_BOOST_OPTIONAL 0
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#endif
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#if CLI11_BOOST_OPTIONAL
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#include <boost/version.hpp>
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#if BOOST_VERSION < 106100
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#error "This boost::optional version is not supported, use 1.61 or better"
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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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#include <boost/optional/optional_io.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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