Late to the party, but you can simply use strtr to “translate characters or replace substrings” <?php $hours = 2; $minutes = 24; $seconds = 35; // Option 1: Replacing %variable echo strtr( ‘Last time logged in was %hours hours, %minutes minutes, %seconds seconds ago’, [ ‘%hours’ => $hours, ‘%minutes’ => $minutes, ‘%seconds’ => $seconds … Read more
Nope, it’s not directly possible. Template metaprogramming is a pure functional language. Every value or type defined through it are immutable. A loop inherently requires mutable variables (Repeatedly test some condition until X happens, then exit the loop). Instead, you would typically rely on recursion. (Instantiate this template with a different template parameter each time, … Read more
Given some complete type MyBase, the following will yield a compile-time error if T is not derived from MyBase: #include <boost/type_traits/is_base_of.hpp> #include <boost/static_assert.hpp> template<typename T> class Foo { BOOST_STATIC_ASSERT_MSG( (boost::is_base_of<MyBase, T>::value), “T must be a descendant of MyBase” ); // Foo implementation as normal }; If you’re using a C++03 compiler with TR1, you can … Read more
You can provide a specialization for only that function outside the class declaration. template <typename T> struct Node { // general method split void split() { // implementation here or somewhere else in header } }; // prototype of function declared in cpp void splitIntNode( Node & node ); template <> void Node<int>::split() { splitIntNode( … Read more
The short answer is “templates are not string substitution”. void f(void) has meaning only so far as it is an alias for void f() in C++, in order to be backwards compatible with C. The first step is to use variadics, as noted elsewhere. The second step is figuring out how to map void returning … Read more
They could. This is the way most early implementations of templates worked, and is still the way the Microsoft compiler worked. It was felt (in the committee) that this was too error prone; it made it too easy to accidentally hijack a name, with the instantiation in one translation unit picking up a local name, … Read more
C++ requires that an inline function definition be present in a translation unit that references the function. Template member functions are implicitly inline, but also by default are instantiated with external linkage. Hence the duplication of definitions that will be visible to the linker when the same template is instantiated with the same template arguments … Read more
You have two choices here — the first is the way you did it — simply add the appropriate markup into a template (or a block if you want to be able to override it in templates which extend your first template.) The second way is to use Jinja2’s include function: {% block javascript %} … Read more
I spent hours searching the web to find information about doing this. Its not actually that hard to set up project templates for Xcode4.5 but its hard to find information on the web that puts it all together! Hopefully the steps below will help you to create your own. Setting Up Lets start by getting … Read more
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.