Can Template Arguments Be Deduced Automatically in C Using `template`?

Automating Template Argument Deduction with template

Question:

Can template arguments be passed during compile-time without explicitly specifying their types? For instance, instead of template could we use template?

Answer:

The mentioned approach is not possible in C . The closest alternative involves using macros:

<code class="cpp">#define AUTO_ARG(x) decltype(x), x

f.bar<AUTO_ARG(5)>();
f.bar<AUTO_ARG(&Baz::bang)>();</code>

An alternative approach is to use a generator function that deduces the template argument:

<code class="cpp">template <typename T>
struct foo {
    foo(const T&amp;) {} // do whatever
};

template <typename T>
foo<T> make_foo(const T&amp; x) {
    return foo<T>(x);
}</code>

Now, instead of writing:

<code class="cpp">foo<int>(5);</code>

We can simply write:

<code class="cpp">make_foo(5);</code>

This method automates template argument deduction, providing a more convenient way to pass arguments.

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