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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef {{"_".join(config.protocol.namespace)}}_Maybe_h
#define {{"_".join(config.protocol.namespace)}}_Maybe_h
// This macro allows to test for the version of the GNU C++ compiler.
// Note that this also applies to compilers that masquerade as GCC,
// for example clang and the Intel C++ compiler for Linux.
// Use like:
// #if IP_GNUC_PREREQ(4, 3, 1)
// ...
// #endif
#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
#define IP_GNUC_PREREQ(major, minor, patchlevel) \
((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= \
((major)*10000 + (minor)*100 + (patchlevel)))
#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
#define IP_GNUC_PREREQ(major, minor, patchlevel) \
((__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= \
((major)*10000 + (minor)*100 + (patchlevel)))
#else
#define IP_GNUC_PREREQ(major, minor, patchlevel) 0
#endif
#if defined(__mips64)
#define IP_TARGET_ARCH_MIPS64 1
#elif defined(__MIPSEB__) || defined(__MIPSEL__)
#define IP_TARGET_ARCH_MIPS 1
#endif
// Allowing the use of noexcept by removing the keyword on older compilers that
// do not support adding noexcept to default members.
#if ((IP_GNUC_PREREQ(4, 9, 0) && !defined(IP_TARGET_ARCH_MIPS) && \
!defined(IP_TARGET_ARCH_MIPS64)) || \
(defined(__clang__) && __cplusplus > 201300L))
#define IP_NOEXCEPT noexcept
#else
#define IP_NOEXCEPT
#endif
//#include "Forward.h"
{% for namespace in config.protocol.namespace %}
namespace {{namespace}} {
{% endfor %}
template<typename T>
class Maybe {
public:
Maybe() : m_value() { }
Maybe(std::unique_ptr<T> value) : m_value(std::move(value)) { }
Maybe(Maybe&& other) IP_NOEXCEPT : m_value(std::move(other.m_value)) {}
void operator=(std::unique_ptr<T> value) { m_value = std::move(value); }
T* fromJust() const { DCHECK(m_value); return m_value.get(); }
T* fromMaybe(T* defaultValue) const { return m_value ? m_value.get() : defaultValue; }
bool isJust() const { return !!m_value; }
std::unique_ptr<T> takeJust() { DCHECK(m_value); return std::move(m_value); }
private:
std::unique_ptr<T> m_value;
};
template<typename T>
class MaybeBase {
public:
MaybeBase() : m_isJust(false) { }
MaybeBase(T value) : m_isJust(true), m_value(value) { }
MaybeBase(MaybeBase&& other) IP_NOEXCEPT
: m_isJust(other.m_isJust),
m_value(std::move(other.m_value)) {}
void operator=(T value) { m_value = value; m_isJust = true; }
T fromJust() const { DCHECK(m_isJust); return m_value; }
T fromMaybe(const T& defaultValue) const { return m_isJust ? m_value : defaultValue; }
bool isJust() const { return m_isJust; }
T takeJust() { DCHECK(m_isJust); return m_value; }
protected:
bool m_isJust;
T m_value;
};
template<>
class Maybe<bool> : public MaybeBase<bool> {
public:
Maybe() { }
Maybe(bool value) : MaybeBase(value) { }
Maybe(Maybe&& other) IP_NOEXCEPT : MaybeBase(std::move(other)) {}
using MaybeBase::operator=;
};
template<>
class Maybe<int> : public MaybeBase<int> {
public:
Maybe() { }
Maybe(int value) : MaybeBase(value) { }
Maybe(Maybe&& other) IP_NOEXCEPT : MaybeBase(std::move(other)) {}
using MaybeBase::operator=;
};
template<>
class Maybe<double> : public MaybeBase<double> {
public:
Maybe() { }
Maybe(double value) : MaybeBase(value) { }
Maybe(Maybe&& other) IP_NOEXCEPT : MaybeBase(std::move(other)) {}
using MaybeBase::operator=;
};
template<>
class Maybe<String> : public MaybeBase<String> {
public:
Maybe() { }
Maybe(const String& value) : MaybeBase(value) { }
Maybe(Maybe&& other) IP_NOEXCEPT : MaybeBase(std::move(other)) {}
using MaybeBase::operator=;
};
{% for namespace in config.protocol.namespace %}
} // namespace {{namespace}}
{% endfor %}
#undef IP_GNUC_PREREQ
#undef IP_TARGET_ARCH_MIPS64
#undef IP_TARGET_ARCH_MIPS
#undef IP_NOEXCEPT
#endif // !defined({{"_".join(config.protocol.namespace)}}_Maybe_h)
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