build-system-toy/types.h

#pragma once

#include "ghc/filesystem.hpp"

namespace build {

  namespace fs = ghc::filesystem;

  /**
   * A simple opaque typedef which allows us to perform type-sensitive
   * output while creating the command string to be invoked.
   * For example, command_builder << output_file would automagically
   * know to output the tokens: ["-o", output_file.get()].
   */
  template <typename T, typename> class named_type {
  private:
    T value_;

  public:
    named_type(T const & value) : value_(value) {}
    named_type(T && value) : value_(std::move(value)) {}
    T const & get() const { return value_; }
    operator T const &() const { return value_; }
  };

  struct indent_t {
    int value;
  };

  using source_file = named_type<fs::path, struct source_file_tag>;
  using object_file = named_type<fs::path, struct object_file_tag>;
  using output_file = named_type<fs::path, struct output_file_tag>;

  enum version { none, cxx11, cxx14, cxx17 };

}