cannot pass object of non-trivial type 'const rediscpp::resp::deserialization::error_message' through variadic function

[slhck]

I have a simple example:

#include <iostream>

#define REDISCPP_HEADER_ONLY
#include <redis-cpp/stream.h>
#include <redis-cpp/execute.h>

int main(int argc, char *argv[])
{
  try
  {
    auto stream = rediscpp::make_stream(
        "localhost",
        "6379"
      );

    auto const key = "my_key";

    auto response = rediscpp::execute(*stream, "set",
                                      key, "Some value for 'my_key'", "ex", "60");

    std::cout << "Set key '" << key << "': " << response.as<std::string>() << std::endl;

    response = rediscpp::execute(*stream, "get", key);
    std::cout << "Get key '" << key << "': " << response.as<std::string>() << std::endl;

    response = rediscpp::execute(*stream, "del", key);
    std::cout << "Deleted key '" << key << "': " << response.as<std::string>() << std::endl;
  }
  catch (std::exception const &e)
  {
    std::cerr << "Error: " << e.what() << std::endl;
    return EXIT_FAILURE;
  }
  return EXIT_SUCCESS;
}

When compiling this under macOS 10.15.7, I get:

➜ meson compile -C builddir
ninja: Entering directory `builddir'
[1/2] Compiling C++ object redis_test.p/src_redis_test.cpp.o
FAILED: redis_test.p/src_redis_test.cpp.o 
c++ -Iredis_test.p -I. -I.. -I../include/redis-cpp -I../include -Xclang -fcolor-diagnostics -pipe -Wall -Winvalid-pch -Wnon-virtual-dtor -Wextra -Wpedantic -std=c++17 -g -MD -MQ redis_test.p/src_redis_test.cpp.o -MF redis_test.p/src_redis_test.cpp.o.d -o redis_test.p/src_redis_test.cpp.o -c ../src/redis_test.cpp
In file included from ../src/redis_test.cpp:5:
In file included from ../include/redis-cpp/execute.h:21:
../include/redis-cpp/value.h:203:33: error: cannot pass object of non-trivial type 'const rediscpp::resp::deserialization::error_message' through variadic function; call will abort at runtime [-Wnon-pod-varargs]
                    if (is_null(val))
                                ^
../include/redis-cpp/value.h:116:16: note: in instantiation of function template specialization 'rediscpp::value::get_value<std::__1::basic_string_view<char, std::__1::char_traits<char> >, rediscpp::resp::deserialization::error_message>' requested here
        return get_value<std::string_view, resp::deserialization::error_message>();
               ^
../include/redis-cpp/value.h:203:33: error: cannot pass object of non-trivial type 'const rediscpp::resp::deserialization::simple_string' through variadic function; call will abort at runtime [-Wnon-pod-varargs]
                    if (is_null(val))
                                ^
../include/redis-cpp/value.h:122:16: note: in instantiation of function template specialization 'rediscpp::value::get_value<std::__1::basic_string_view<char, std::__1::char_traits<char> >, rediscpp::resp::deserialization::simple_string>' requested here
        return get_value<std::string_view, resp::deserialization::simple_string>();
               ^
2 errors generated.
ninja: build stopped: subcommand failed.

More info on the compiler:

➜ c++ --version
Apple clang version 12.0.0 (clang-1200.0.32.29)
Target: x86_64-apple-darwin19.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any idea what the problem could be?

[tdv]

I've just fixed that for c++ 17 implementations within ubuntu and clang 10. Hopefully, it'll work and on MacOS.
Please, try it and report the result.
Good luck.
Regards.

[slhck]

It works now, thank you for the quick response!