C++ variant::as_decimal方法代码示例

void arrow_primitive::set_value(const std::string& key, const variant& value)
{
	if(key == "points") {
		set_points(value);
	} else if(key == "color") {
		color_ = graphics::color(value);
	} else if(key == "granularity") {
		granularity_ = value.as_decimal().as_float();
	} else if(key == "arrow_head_length") {
		arrow_head_length_ = value.as_int();
	} else if(key == "arrow_head_width") {
		arrow_head_width_ = value.as_decimal().as_float();
	} else if(key == "fade_in_length") {
		fade_in_length_ = value.as_int();
	} else if(key == "width_base") {
		width_base_ = value.as_decimal().as_float();
	} else if(key == "width_head") {
		width_head_ = value.as_decimal().as_float();
	} else {
		ASSERT_LOG(false, "ILLEGAL KEY IN ARROW: " << key);
	}

	varray_.clear();
	carray_.clear();
}

void slider::set_value(const std::string& key, const variant& v)
{
	if(key == "position") {
		position_  = v.as_decimal().as_float();
	}
	widget::set_value(key, v);
}

variant variant::operator/(const variant& v) const
{
	if(type_ == TYPE_DECIMAL || v.type_ == TYPE_DECIMAL) {
		int denominator = v.as_decimal();

		if(denominator == 0) {
			throw type_error((formatter() << "divide by zero error").str());
		}

		long long long_int = as_decimal();

		long_int *= 10000;

		long_int /= denominator;

		if( long_int%10 >= 5) {
			long_int /= 10;
			++long_int;
		} else
			long_int/=10;

		return variant(  static_cast<int>(long_int) , variant::DECIMAL_VARIANT);
	}


	const int numerator = as_int();
	const int denominator = v.as_int();
	if(denominator == 0) {
		throw type_error((formatter() << "divide by zero error").str());;
	}

	return variant(numerator/denominator);
}

bool variant::operator==(const variant& v) const
{
	if(type_ != v.type_) {
		if(type_ == TYPE_DECIMAL || v.type_ == TYPE_DECIMAL) {
			return as_decimal() == v.as_decimal();
		}

		return false;
	}

	switch(type_) {
	case TYPE_NULL: {
		return v.is_null();
	}

	case TYPE_STRING: {
		return string_->str == v.string_->str;
	}

	case TYPE_INT: {
		return int_value_ == v.int_value_;
	}

	case TYPE_DECIMAL: {
		return decimal_value_ == v.decimal_value_;
	}

	case TYPE_LIST: {
		if(num_elements() != v.num_elements()) {
			return false;
		}

		for(size_t n = 0; n != num_elements(); ++n) {
			if((*this)[n] != v[n]) {
				return false;
			}
		}

		return true;
	}

	case TYPE_MAP: {
		return map_->elements == v.map_->elements;
	}

	case TYPE_CALLABLE_LOADING: {
		return false;
	}

	case TYPE_CALLABLE: {
		return callable_->equals(v.callable_);
	}
	case TYPE_FUNCTION: {
		return fn_ == v.fn_;
	}
	}

	assert(false);
	return false;
}

variant variant::operator*(const variant& v) const
{
	if(type_ == TYPE_DECIMAL || v.type_ == TYPE_DECIMAL) {
		return variant(as_decimal() * v.as_decimal());
	}

	if(type_ == TYPE_LIST) {
		int ncopies = v.as_int();
		if(ncopies < 0) {
			ncopies *= -1;
		}
		const std::vector<variant>& items = list_->elements;
		std::vector<variant> res;
		res.reserve(items.size()*ncopies);
		for(int n = 0; n != ncopies; ++n) {
			for(int m = 0; m != items.size(); ++m) {
				res.push_back(items[m]);
			}
		}

		return variant(&res);
	}
	
	return variant(as_int() * v.as_int());
}

	void bar_widget::set_value(const std::string& key, const variant& value)
	{
		if(key == "segments") {
			segments_ = value.as_int();
			ASSERT_GE(segments_, 0);
			init();
		} else if(key == "segment_length") {
			segment_length_ = value.as_int();
			ASSERT_GT(segment_length_, 0);
			init();
		} else if(key == "tick_width") {
			tick_width_ = value.as_int();
			ASSERT_GT(tick_width_, 0);
			init();
		} else if(key == "scale") {
			scale_ = value.as_decimal().as_float();
			ASSERT_GT(scale_, 0.0f);
			init();
		} else if(key == "drain_rate") {
			drain_rate_ = value.as_decimal().as_float();
			ASSERT_GE(drain_rate_, 0.0);
		} else if(key == "drained") {
			int drain = value.as_int();
			if(drain == drained_segments_) {
				return;
			}
			int animation_start_position = segments_-drained_segments_;
			animation_current_position_ = 0;
			drained_segments_after_anim_ = drain;
			if(drained_segments_after_anim_ < 0) {
				drained_segments_after_anim_ = 0;
			}
			if(drained_segments_after_anim_ > segments_) {
				drained_segments_after_anim_ = segments_;
			}
			int animation_end_position = segments_-drained_segments_after_anim_;
			animation_end_point_unscaled_ = animation_end_position - animation_start_position;
			animating_ = true;
			init();
		} else if(key == "max_width") { 
			bar_max_width_ = value.as_int();
			init();
		} else if(key == "animation_position") {
			animation_current_position_ = value.as_decimal().as_float();
		}
		widget::set_value(key, value);
	}

variant variant::operator-(const variant& v) const
{
	if(type_ == TYPE_DECIMAL || v.type_ == TYPE_DECIMAL) {
		return variant( as_decimal() - v.as_decimal() , DECIMAL_VARIANT);
	}

	return variant(as_int() - v.as_int());
}

variant variant::operator/(const variant& v) const
{
	if(type_ == TYPE_DECIMAL || v.type_ == TYPE_DECIMAL) {
		if(v.as_decimal().value() == 0) {
			throw type_error((formatter() << "divide by zero error").str());
		}

		return variant(as_decimal() / v.as_decimal());
	}

	const int numerator = as_int();
	const int denominator = v.as_int();
	if(denominator == 0) {
		throw type_error(formatter() << "divide by zero error");
	}

	return variant(numerator/denominator);
}

void luaW_pushfaivariant(lua_State* L, variant val) {
	if(val.is_int()) {
		lua_pushinteger(L, val.as_int());
	} else if(val.is_decimal()) {
		lua_pushnumber(L, val.as_decimal() / 1000.0);
	} else if(val.is_string()) {
		const std::string result_string = val.as_string();
		lua_pushlstring(L, result_string.c_str(), result_string.size());
	} else if(val.is_list()) {
		lua_newtable(L);
		for(const variant& v : val.as_list()) {
			lua_pushinteger(L, lua_rawlen(L, -1) + 1);
			luaW_pushfaivariant(L, v);
			lua_settable(L, -3);
		}
	} else if(val.is_map()) {
		typedef std::map<variant,variant>::value_type kv_type;
		lua_newtable(L);
		for(const kv_type& v : val.as_map()) {
			luaW_pushfaivariant(L, v.first);
			luaW_pushfaivariant(L, v.second);
			lua_settable(L, -3);
		}
	} else if(val.is_callable()) {
		// First try a few special cases
		if(unit_callable* u_ref = val.try_convert<unit_callable>()) {
			const unit& u = u_ref->get_unit();
			unit_map::iterator un_it = resources::gameboard->units().find(u.get_location());
			if(&*un_it == &u) {
				luaW_pushunit(L, u.underlying_id());
			} else {
				luaW_pushunit(L, u.side(), u.underlying_id());
			}
		} else if(location_callable* loc_ref = val.try_convert<location_callable>()) {
			luaW_pushlocation(L, loc_ref->loc());
		} else {
			// If those fail, convert generically to a map
			const formula_callable* obj = val.as_callable();
			std::vector<formula_input> inputs;
			obj->get_inputs(&inputs);
			lua_newtable(L);
			for(const formula_input& attr : inputs) {
				if(attr.access == FORMULA_WRITE_ONLY) {
					continue;
				}
				lua_pushstring(L, attr.name.c_str());
				luaW_pushfaivariant(L, obj->query_value(attr.name));
				lua_settable(L, -3);
			}
		}
	} else if(val.is_null()) {
		lua_pushnil(L);
	}
}