In this example problematic line is declaration of repo member of Basket
#include <vector>
#include <string>
#include <memory>
#include <unordered_map>
struct Product {
std::unique_ptr<std::string> description;
};
struct Basket {
// this line is OK, just moves it
std::vector<Product> ps;
// Doesn't compile with this line uncommented ! Can't move map ?
// std::unordered_map<std::string, Product> repo;
};
int main(int argc, const char *argv[]) {
std::vector<Basket> baskets;
Basket b1;
baskets.push_back(std::move(b1));
return 0;
}
When repo member declaration is uncommented, then i getting scary sheet of errors.
Tested on gcc 4.7.2 and Clang 3.3 and got same error:
error: call to implicitly-deleted copy constructor of 'Product'
... lot of similar stuff ...
It's an unimplemented feature in your libstdc++.
I checked my GCC 4.7.2's headers, unordered_map doesn't even have move constructor/assignment operator. They might have backported it for 4.7.3, but either way you'll have to upgrade your compiler and/or your libstdc++ to get that line to compile.
With a recent enough libstdc++ it compiles just fine