add die_on_fail to make test easier

string.hpp

@@ -20,6 +20,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <cstdint>
 #include <stdexcept>
 #include <sstream>
 #include <type_traits>

test.hpp

+#include <rlib/macro.hpp>
+#include <rlib/string.hpp>
+#include <stdexcept>
+#include <cerrno>
+#include <string>
+
+namespace rlib::details {
+struct die_impl {
+    explicit die_impl(std::string hint_str) : msg(std::move(hint_str)) {}
+    auto operator=(const long &syscall_res) const {
+        if(syscall_res < 0)
+            throw std::runtime_error(rlib::string("Dead. {}. System call returns {}, errno={}, strerror={}").format(msg, syscall_res, errno,
+                                                                                                     strerror(errno)));
+    }
+    std::string msg;
+};
+}
+#define die_on_fail rlib::details::die_impl(std::string(__FILE__ ":" RLIB_MACRO_TO_CSTR(__LINE__))) =
+

test/src/test.cc

+#include <rlib/test.hpp>
+
+int main() {
+    die_on_fail 0;
+}
+