This module allows you to convert a template type to a GDALDataType at compile-time.
Q: Why would someone want this?
A: This module provides syntactic sugar for easily writing clean, generic, raster code that interacts with the GDAL library. Here are a couple example uses:
// Generic row major matrix with RasterIO functions.
template<typename T>
class RowMajorMatrix<T> {
// Determine the GDAL data type for the template argument.
static const GDALDataType kRasterType = gdaltypetraits::Convert<T>::value;
void Write() {
// Provide the template argument as part of a RasterIO operation.
RasterIO(...args..., kRasterType);
}
}template<typename T>
void DoSomething(T* array, size_t length) {
// Squak if the user tries to use a type that doesn't have a GDALDataType equivalent
// e.g. std::string
static_assert(
gdaltypetraits::Convert<T>::is_recognized,
"The template argument can't be converted to a GDAL data type.");
// The idea of checking for GDT_Unknown can be extended into some interesting template metaprogramming...
}