92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
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// Copyright satoren
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#pragma once
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#include <memory>
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#include "kaguya/config.hpp"
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#include "kaguya/traits.hpp"
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#include "kaguya/utility.hpp"
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namespace kaguya {
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/// @brief any data holder class for push to lua
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class AnyDataPusher {
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public:
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int pushToLua(lua_State *state) const {
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if (empty()) {
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lua_pushnil(state);
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return 1;
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} else {
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return holder_->pushToLua(state);
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}
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}
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AnyDataPusher() : holder_() {}
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template <typename DataType>
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AnyDataPusher(const DataType &v) : holder_(new DataHolder<DataType>(v)) {}
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#if KAGUYA_USE_CPP11
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AnyDataPusher(AnyDataPusher &&other) : holder_(std::move(other.holder_)) {}
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AnyDataPusher &operator=(AnyDataPusher &&rhs) {
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holder_ = std::move(rhs.holder_);
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return *this;
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}
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template <typename DataType>
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AnyDataPusher(DataType &&v)
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: holder_(new DataHolder<DataType>(std::move(v))) {}
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#endif
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AnyDataPusher(const AnyDataPusher &other) : holder_(other.holder_) {}
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AnyDataPusher &operator=(const AnyDataPusher &other) {
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holder_ = other.holder_;
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return *this;
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}
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bool empty() const { return !holder_.get(); }
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private:
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struct DataHolderBase {
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virtual int pushToLua(lua_State *data) const = 0;
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// virtual DataHolderBase * clone(void) = 0;
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virtual ~DataHolderBase() {}
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};
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template <typename Type> class DataHolder : public DataHolderBase {
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typedef typename traits::decay<Type>::type DataType;
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public:
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#if KAGUYA_USE_CPP11
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explicit DataHolder(DataType &&v) : data_(std::forward<DataType>(v)) {}
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#else
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explicit DataHolder(const DataType &v) : data_(v) {}
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#endif
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virtual int pushToLua(lua_State *state) const {
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return util::push_args(state, data_);
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}
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private:
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DataType data_;
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};
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// specialize for string literal
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template <int N> struct DataHolder<const char[N]> : DataHolder<std::string> {
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explicit DataHolder(const char *v)
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: DataHolder<std::string>(
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std::string(v, v[N - 1] != '\0' ? v + N : v + N - 1)) {}
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};
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template <int N> struct DataHolder<char[N]> : DataHolder<std::string> {
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explicit DataHolder(const char *v)
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: DataHolder<std::string>(
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std::string(v, v[N - 1] != '\0' ? v + N : v + N - 1)) {}
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};
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standard::shared_ptr<DataHolderBase> holder_;
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};
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/// @ingroup lua_type_traits
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/// @brief lua_type_traits for AnyDataPusher
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template <> struct lua_type_traits<AnyDataPusher> {
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static int push(lua_State *l, const AnyDataPusher &data) {
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return data.pushToLua(l);
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}
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};
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}
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