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-rw-r--r--src/util/translation.h42
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diff --git a/src/util/translation.h b/src/util/translation.h
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+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_TRANSLATION_H
+#define BITCOIN_UTIL_TRANSLATION_H
+
+#include <tinyformat.h>
+
+#include <utility>
+
+/**
+ * Bilingual messages:
+ * - in GUI: user's native language + untranslated (i.e. English)
+ * - in log and stderr: untranslated only
+ */
+struct bilingual_str {
+ std::string original;
+ std::string translated;
+};
+
+namespace tinyformat {
+template <typename... Args>
+bilingual_str format(const bilingual_str& fmt, const Args&... args)
+{
+ return bilingual_str{format(fmt.original, args...), format(fmt.translated, args...)};
+}
+} // namespace tinyformat
+
+/** Translate a message to the native language of the user. */
+const extern std::function<std::string(const char*)> G_TRANSLATION_FUN;
+
+/**
+ * Translation function.
+ * If no translation function is set, simply return the input.
+ */
+inline bilingual_str _(const char* psz)
+{
+ return bilingual_str{psz, G_TRANSLATION_FUN ? (G_TRANSLATION_FUN)(psz) : psz};
+}
+
+#endif // BITCOIN_UTIL_TRANSLATION_H