formatter.h

Go to the documentation of this file.

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
 
#pragma once
 
 
#include <concepts>
#include <format>
#include <string_view>
 
#include "iceberg/util/formattable.h"
 
template <std::derived_from<iceberg::util::Formattable> Derived>
struct std::formatter<Derived> : std::formatter<std::string_view> {
  template <class FormatContext>
  auto format(const iceberg::util::Formattable& obj, FormatContext& ctx) const {
    return std::formatter<string_view>::format(obj.ToString(), ctx);
  }
};
 
template <typename T>
  requires requires(const T& t) {
    { ToString(t) } -> std::convertible_to<std::string_view>;
  }
struct std::formatter<T> : std::formatter<std::string_view> {
  template <class FormatContext>
  auto format(const T& value, FormatContext& ctx) const {
    return std::formatter<std::string_view>::format(ToString(value), ctx);
  }
};