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Update README.md
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@ -322,7 +322,7 @@ argparse::ArgumentParser program("test");
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program.add_argument("input")
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.default_value("baz")
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.action([=](const std::string& value) {
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.action([](const std::string& value) {
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static const std::vector<std::string> choices = { "foo", "bar", "baz" };
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if (std::find(choices.begin(), choices.end(), value) != choices.end()) {
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return value;
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