diff options
Diffstat (limited to 'src/libutil/util.hh')
| -rw-r--r-- | src/libutil/util.hh | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/libutil/util.hh b/src/libutil/util.hh index b74c1d4173..4e3a011b34 100644 --- a/src/libutil/util.hh +++ b/src/libutil/util.hh @@ -14,6 +14,7 @@ #include <cstdio> #include <map> #include <sstream> +#include <experimental/optional> #ifndef HAVE_STRUCT_DIRENT_D_TYPE #define DT_UNKNOWN 0 @@ -232,7 +233,8 @@ pid_t startProcess(std::function<void()> fun, const ProcessOptions & options = P /* Run a program and return its stdout in a string (i.e., like the shell backtick operator). */ string runProgram(Path program, bool searchPath = false, - const Strings & args = Strings(), const string & input = ""); + const Strings & args = Strings(), + const std::experimental::optional<std::string> & input = {}); class ExecError : public Error { |