mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 08:40:50 +00:00
b79ead9c84
* Replicate poco into base/poco/ * De-register poco submodule * Build poco from ClickHouse * Exclude poco from stylecheck * Exclude poco from whitespace check * Exclude poco from typo check * Remove x bit from sources/headers (the style check complained) * Exclude poco from duplicate include check * Fix fasttest * Remove contrib/poco-cmake/* * Simplify poco build descriptions * Remove poco stuff not used by ClickHouse * Glob poco sources * Exclude poco from clang-tidy
145 lines
1.9 KiB
C++
145 lines
1.9 KiB
C++
//
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// MetaProgramming.h
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//
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// Library: Foundation
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// Package: Core
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// Module: MetaProgramming
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//
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// Common definitions useful for Meta Template Programming
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_MetaProgramming_INCLUDED
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#define Foundation_MetaProgramming_INCLUDED
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#include "Poco/Foundation.h"
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namespace Poco {
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template <typename T>
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struct IsReference
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/// Use this struct to determine if a template type is a reference.
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{
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enum
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{
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VALUE = 0
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};
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};
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template <typename T>
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struct IsReference<T&>
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{
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enum
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{
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VALUE = 1
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};
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};
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template <typename T>
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struct IsReference<const T&>
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{
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enum
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{
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VALUE = 1
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};
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};
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template <typename T>
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struct IsConst
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/// Use this struct to determine if a template type is a const type.
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{
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enum
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{
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VALUE = 0
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};
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};
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template <typename T>
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struct IsConst<const T&>
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{
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enum
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{
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VALUE = 1
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};
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};
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template <typename T>
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struct IsConst<const T>
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{
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enum
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{
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VALUE = 1
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};
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};
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template <typename T, int i>
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struct IsConst<const T[i]>
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/// Specialization for const char arrays
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{
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enum
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{
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VALUE = 1
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};
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};
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template <typename T>
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struct TypeWrapper
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/// Use the type wrapper if you want to decouple constness and references from template types.
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{
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typedef T TYPE;
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typedef const T CONSTTYPE;
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typedef T& REFTYPE;
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typedef const T& CONSTREFTYPE;
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};
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template <typename T>
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struct TypeWrapper<const T>
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{
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typedef T TYPE;
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typedef const T CONSTTYPE;
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typedef T& REFTYPE;
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typedef const T& CONSTREFTYPE;
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};
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template <typename T>
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struct TypeWrapper<const T&>
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{
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typedef T TYPE;
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typedef const T CONSTTYPE;
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typedef T& REFTYPE;
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typedef const T& CONSTREFTYPE;
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};
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template <typename T>
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struct TypeWrapper<T&>
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{
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typedef T TYPE;
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typedef const T CONSTTYPE;
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typedef T& REFTYPE;
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typedef const T& CONSTREFTYPE;
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};
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} // namespace Poco
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#endif // Foundation_MetaProgramming_INCLUDED
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