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-rw-r--r--libbutl/prompt.mxx36
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+// file : libbutl/prompt.mxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef __cpp_modules
+#pragma once
+#endif
+
+// C includes.
+
+#ifndef __cpp_lib_modules
+#include <string>
+#endif
+
+// Other includes.
+
+#ifdef __cpp_modules
+export module butl.prompt;
+#ifdef __cpp_lib_modules
+import std.core;
+#endif
+#endif
+
+#include <libbutl/export.hxx>
+
+LIBBUTL_MODEXPORT namespace butl
+{
+ // The Y/N prompt. The def argument, if specified, should be either 'y' or
+ // 'n'. It is used as the default answer, in case the user just hits enter.
+ //
+ // Write the prompt to diag_stream. Throw ios_base::failure if no answer
+ // could be extracted from stdin (for example, because it was closed).
+ //
+ LIBBUTL_SYMEXPORT bool
+ yn_prompt (const std::string&, char def = '\0');
+}