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add image_data_null which is cheap to construct (no mem alloc)

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add default ctor to image_data_any -> image_data_null
This commit is contained in:
artemp 2014-12-03 10:26:21 +01:00
parent 83aa06e329
commit 33607145a6
1 changed files with 11 additions and 1 deletions
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12
include/mapnik/image_data_any.hpp
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@ -28,7 +28,15 @@
namespace mapnik {
using image_data_base = util::variant<image_data_32, image_data_8, image_data_16, image_data_float32>;
struct image_data_null
{
unsigned char const* getBytes() const { return nullptr; }
unsigned char* getBytes() { return nullptr;}
std::size_t width() const { return 0; }
std::size_t height() const { return 0; }
};
using image_data_base = util::variant<image_data_null, image_data_32, image_data_8, image_data_16, image_data_float32>;
namespace detail {
@ -72,6 +80,8 @@ struct get_height_visitor : util::static_visitor<std::size_t>
struct image_data_any : image_data_base
{
image_data_any() = default;
template <typename T>
image_data_any(T && data) noexcept
: image_data_base(std::move(data)) {}