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POConfusing function lookup with templates in C++
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1396458
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CreationDate
2009-09-08T21:37:11.243
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2009-09-09T22:57:59.003
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2009-09-08T23:03:30.913
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text
Body
Starting with the following (using <code>gcc version 4.0.1</code>): <pre><code>namespace name { template <typename T> void foo(const T& t) { bar(t); } template <typename T> void bar(const T& t) { baz(t); } void baz(int) { std::cout << "baz(int)\n"; } } </code></pre> If I add (in the global namespace) <pre><code>struct test {}; void bar(const test&) { std::cout << "bar(const test&)\n"; } </code></pre> then, as I expected, <pre><code>name::foo(test()); // produces "bar(const test&)" </code></pre> But if I just add <pre><code>void bar(const double&) { std::cout << "bar(const double&)\n"; } </code></pre> it can't seem to find this overload: <pre><code>name::foo(5.0) // produces "baz(int)" </code></pre> What's more, <pre><code>typedef std::vector<int> Vec; void bar(const Vec&) { std::cout << "bar(const Vec&)\n"; } </code></pre> doesn't appear either, so <pre><code>name::foo(Vec()); </code></pre> gives a compiler error <pre><code>error: cannot convert ‘const std::vector<int, std::allocator<int> >’ to ‘int’ for argument ‘1’ to ‘void name::baz(int)’ </code></pre> Is this how the lookup is supposed to work? (Note: if I remove the namespace <code>name</code>, then everything works as I expected.) How can I modify this example so that any overload for <code>bar</code> is considered? (I thought that overloads were supposed to be considered before templates?)
Tags
<c++><templates><lookup>
Title
Confusing function lookup with templates in C++
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