Nested C++ template parameters for functions

std::vector has two parameters, type and allocator. Try this template <typename T, typename Alloc, template <typename, typename> class V> void print_container(V<T, Alloc> &con) { } print_container(vec); This will work for vector, list, etc., but will not work with map, set. However, since you use auto you can use C++11 and then you can to this: … Read more

Does using std::array lead to code bloat? [duplicate]

I wouldn’t worry about it. If you look at the interface of std::array<T, N>, it is very small and most member functions (basically providing wrappers for pointer manipulation) are one-liners that will be completely optimized away / inlined by any decent compiler on Release mode optimization levels. Furthermore, you don’t pay for what you don’t … Read more

What are the benefits of a directive template function in Angularjs?

The compilation function can be used to change the DOM before the resulting template function is bound to the scope. Consider the following example: <div my-directive></div> You can use the compile function to change the template DOM like this: app.directive(‘myDirective’, function(){ return { // Compile function acts on template DOM // This happens before it … Read more

c++ template and header files [duplicate]

Headers. It’s because templates are instantiated at compile-time, not link-time, and different translation units (roughly equivalent to your .cpp files) only “know about” each other at link-time. Headers tend to be widely “known about” at compile-time because you #include them in any translation unit that needs them. Read https://isocpp.org/wiki/faq/templates for more.

C++11: I can go from multiple args to tuple, but can I go from tuple to multiple args? [duplicate]

Try something like this: // implementation details, users never invoke these directly namespace detail { template <typename F, typename Tuple, bool Done, int Total, int… N> struct call_impl { static void call(F f, Tuple && t) { call_impl<F, Tuple, Total == 1 + sizeof…(N), Total, N…, sizeof…(N)>::call(f, std::forward<Tuple>(t)); } }; template <typename F, typename Tuple, … Read more

c++ template class; function with arbitrary container type, how to define it?

Traits solution. Generalize not more than needed, and not less. In some cases that solution might not be enough as it will match any template with such signature (e.g. shared_ptr), in which case you could make use of type_traits, very much like duck-typing (templates are duck typed in general). #include <type_traits> // Helper to determine … Read more

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