Update monoid
(Mylib/AlgebraicStructure/Monoid/update.cpp)

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• Last update: 2021-04-23 23:44:44+09:00
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Operations

Requirements

Notes

Problems

References

Verified with

• test/aoj/DSL_2_D/main.test.cpp
• test/aoj/DSL_2_F/main.dynamic.test.cpp
• test/aoj/DSL_2_F/main.test.cpp
• test/aoj/DSL_2_I/main.test.cpp
• test/yukicoder/899/main.test.cpp

Code

#pragma once
#include <optional>

namespace haar_lib {
  template <typename T>
  struct update_monoid {
    using value_type = std::optional<T>;
    value_type operator()() const { return std::nullopt; }
    value_type operator()(const value_type &a, const value_type &b) const { return (a ? a : b); }
  };
}  // namespace haar_lib

#line 2 "Mylib/AlgebraicStructure/Monoid/update.cpp"
#include <optional>

namespace haar_lib {
  template <typename T>
  struct update_monoid {
    using value_type = std::optional<T>;
    value_type operator()() const { return std::nullopt; }
    value_type operator()(const value_type &a, const value_type &b) const { return (a ? a : b); }
  };
}  // namespace haar_lib

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