diff options
| -rw-r--r-- | src/util/string.h | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/src/util/string.h b/src/util/string.h index b8e2a06235..cdb41630c6 100644 --- a/src/util/string.h +++ b/src/util/string.h @@ -30,10 +30,11 @@ NODISCARD inline std::string TrimString(const std::string& str, const std::strin * @param separator The separator * @param unary_op Apply this operator to each item in the list */ -template <typename T, typename UnaryOp> -std::string Join(const std::vector<T>& list, const std::string& separator, UnaryOp unary_op) +template <typename T, typename BaseType, typename UnaryOp> +auto Join(const std::vector<T>& list, const BaseType& separator, UnaryOp unary_op) + -> decltype(unary_op(list.at(0))) { - std::string ret; + decltype(unary_op(list.at(0))) ret; for (size_t i = 0; i < list.size(); ++i) { if (i > 0) ret += separator; ret += unary_op(list.at(i)); @@ -41,9 +42,16 @@ std::string Join(const std::vector<T>& list, const std::string& separator, Unary return ret; } +template <typename T> +T Join(const std::vector<T>& list, const T& separator) +{ + return Join(list, separator, [](const T& i) { return i; }); +} + +// Explicit overload needed for c_str arguments, which would otherwise cause a substitution failure in the template above. inline std::string Join(const std::vector<std::string>& list, const std::string& separator) { - return Join(list, separator, [](const std::string& i) { return i; }); + return Join<std::string>(list, separator); } /** |