(mahjong::TileType::Ponzu, 2)
(mahjong::TileType::Ponzu, 3)
(mahjong::TileType::Ponzu, 4)
(mahjong::TileType::Ponzu, 7)
(mahjong::TileType::Ponzu, 8)
(mahjong::TileType::Ponzu, 9)
(mahjong::TileType::Souzu, 2)
(mahjong::TileType::Souzu, 2)
(mahjong::TileType::Souzu, 5)
(mahjong::TileType::Souzu, 5)
(mahjong::TileType::Souzu, 5)
(mahjong::TileType::Special, 3)
(mahjong::TileType::Special, 3)

Waiting for Souzu-2 Or Special-3(a.k.a. West), but can't find it

Steps to reproduce error:

mkdir ./build
cd ./build
cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=true -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_COMPILER=g++ ..

compile error log

[  9%] Building CXX object Source/CMakeFiles/Mini-Mahjong.dir/Constant.cpp.o
g++: error: unrecognized command line option ‘-stdlib=libc++’
make[2]: *** [Source/CMakeFiles/Mini-Mahjong.dir/build.make:83: Source/CMakeFiles/Mini-Mahjong.dir/Constant.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:135: Source/CMakeFiles/Mini-Mahjong.dir/all] Error 2
make: *** [Makefile:104: all] Error 2

Contribution guide proposal

What about using lowercase namespace?
i.e. Instead of using

namespace Mini { ... }

let's use

namespace mini { ... }

Why

For fun of course.
Also, IMO it's more aesthetic and seems more constant using with other libraries like std or boost.

// std::vector< Mini::MyClass > hello;
std::vector< mini::my_class > hello;
boost::nuke_this< mini::server > nuke_server;