Utility for redirecting C++ streams to Python (#1009)
diff --git a/tests/test_iostream.cpp b/tests/test_iostream.cpp
new file mode 100644
index 0000000..e67f88a
--- /dev/null
+++ b/tests/test_iostream.cpp
@@ -0,0 +1,73 @@
+/*
+ tests/test_iostream.cpp -- Usage of scoped_output_redirect
+
+ Copyright (c) 2017 Henry F. Schreiner
+
+ All rights reserved. Use of this source code is governed by a
+ BSD-style license that can be found in the LICENSE file.
+*/
+
+
+#include <pybind11/iostream.h>
+#include "pybind11_tests.h"
+#include <iostream>
+
+
+void noisy_function(std::string msg, bool flush) {
+
+ std::cout << msg;
+ if (flush)
+ std::cout << std::flush;
+}
+
+void noisy_funct_dual(std::string msg, std::string emsg) {
+ std::cout << msg;
+ std::cerr << emsg;
+}
+
+TEST_SUBMODULE(iostream, m) {
+
+ add_ostream_redirect(m);
+
+ // test_evals
+
+ m.def("captured_output_default", [](std::string msg) {
+ py::scoped_ostream_redirect redir;
+ std::cout << msg << std::flush;
+ });
+
+ m.def("captured_output", [](std::string msg) {
+ py::scoped_ostream_redirect redir(std::cout, py::module::import("sys").attr("stdout"));
+ std::cout << msg << std::flush;
+ });
+
+ m.def("guard_output", &noisy_function,
+ py::call_guard<py::scoped_ostream_redirect>(),
+ py::arg("msg"), py::arg("flush")=true);
+
+ m.def("captured_err", [](std::string msg) {
+ py::scoped_ostream_redirect redir(std::cerr, py::module::import("sys").attr("stderr"));
+ std::cerr << msg << std::flush;
+ });
+
+ m.def("noisy_function", &noisy_function, py::arg("msg"), py::arg("flush") = true);
+
+ m.def("dual_guard", &noisy_funct_dual,
+ py::call_guard<py::scoped_ostream_redirect, py::scoped_estream_redirect>(),
+ py::arg("msg"), py::arg("emsg"));
+
+ m.def("raw_output", [](std::string msg) {
+ std::cout << msg << std::flush;
+ });
+
+ m.def("raw_err", [](std::string msg) {
+ std::cerr << msg << std::flush;
+ });
+
+ m.def("captured_dual", [](std::string msg, std::string emsg) {
+ py::scoped_ostream_redirect redirout(std::cout, py::module::import("sys").attr("stdout"));
+ py::scoped_ostream_redirect redirerr(std::cerr, py::module::import("sys").attr("stderr"));
+ std::cout << msg << std::flush;
+ std::cerr << emsg << std::flush;
+ });
+}