RE: Is this error correct

From:
=?Utf-8?B?bXBz?= <mps@discussions.microsoft.com>
Newsgroups:
microsoft.public.vc.language
Date:
Thu, 5 Apr 2007 22:10:01 -0700
Message-ID:
<BDAB1C6E-9000-4A3C-B6B1-D333EA83895F@microsoft.com>
It appears that the problem is related to the default template argument
for vector because the following works fine:

#include <vector>

template <template <typename T, typename U> class X, typename T, typename U>
void f(X<T, U>) { }

int
main() {
    std::vector<int> v;
    f(v);
}

It seems clear that std::vector should be usable wherever a class
requiring one template argument is expected, so in the original example,
I believe the behavior of g++ is correct, while MSVC's behavior is a bug.

"mps" wrote:

The following program compiles cleanly under g++ but fails to deduce template
arguments in VS2005. It seems like it should be able to do so. Is this a bug?

// foo.cpp : Defines the entry point for the console application.
//
#include <vector>
#include <iostream>
using std::vector;

template <template<typename> class Container, typename T>
T median(const Container<T>& c) {
    using std::back_inserter;
    using std::copy;
    using std::vector;

    vector<T> vec(c.begin(),c.end());

    typedef typename vector<T>::size_type vec_sz;
    vec_sz size = vec.size();

    sort(vec.begin(),vec.end());

    vec_sz mid = size/2;

    return size % 2 == 0
        ? (vec[mid] + vec[mid-1]) / 2
        : vec[mid];
}

int
main() {
    vector<int> v;
    v.push_back(1);
    v.push_back(2);
    v.push_back(3);
    std::cout << median(v);
    return 0;
}

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