How does one include TR1?

Question

Different compilers seem to have different ideas about TR1. G++ only seems to accept includes of the type:

#include <tr1/unordered_map>
#include <tr1/memory>
...

While Microsofts compiler only accept:

#include <unordered_map>
#include <memory>
...

As for as I understand TR1, the Microsoft way is the correct one.

Is there a way to get G++ to accept the second version? How does one in general handle TR1 in a portable way?

TR1 is not actually part of the C++ Standard, so the "correct" way of including these non-standard header files must be moot. — , Aug 04 '09 at 16:28

score 17 · Accepted Answer · answered Aug 04 '09 at 17:35

17

Install boost on your machine.
Add the following directory to your search path.

<Boost Install Directory>/boost/tr1/tr1

see here boost tr1 for details

Now when you include <memory> you get the tr1 version of memory that has std::tr1::shared_ptr and then it includes the platform specific version of <memory> to get all the normal goodies.

answered Aug 04 '09 at 17:35

Martin York

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+1. Since TR1 appears to be "lets import these boost classes into the standard" – KitsuneYMG Aug 05 '09 at 00:53
I do `#include "boost/tr1/unordered_map.hpp"` and it uses the tr1 implementation if it is available. – Mohamed Bana Apr 01 '11 at 15:47

score 14 · Answer 2 · answered Jul 15 '10 at 20:20

14

#ifdef _WIN32
    #include <unordered_map>
    #include <memory>
#else
    #include <tr1/unordered_map>
    #include <trl/memory>
#endif

answered Jul 15 '10 at 20:20

mtd

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You should probably base the conditional compilation on the compiler, not the platform (`_WIN64` is real): `#if defined( _MSC_VER ) && ( _MSC_VER > 1300 )`, for example. – IInspectable Aug 17 '13 at 04:33
On last include, tr1 is misspelled as trL ;) – Vladyslav at AssuredLabs Jan 23 '17 at 14:43
If you are doing std::tr1::unordered_map , do you still need to include both and or can you include only ? Trying to reduce the amount of libraries included. – Mona Wade Jun 05 '20 at 20:03

bdonlan · Answer 3 · 2009-08-04T16:37:32.893

4

Perhaps the best way would be to simply use boost libraries for now, as in many cases they have alternatives with a similar interface to TR1 features, and are just in a different (but consistent) header path and namespace. This has the advantage of working on compilers that haven't even begun implementing C++0x. And there are plenty of useful boost libraries that aren't in TR1 at all :)

Alternately, on G++, you could try passing --std=gnu++0x on the command line. This works for <unordered_set> and <unordered_map>, at least. Then to make it available in std::tr1:

namespace std { namespace tr1 { using namespace std; } }

This is evil, naturally. I highly recommend the boost approach instead :)

edited Aug 04 '09 at 16:37

answered Aug 04 '09 at 16:08

bdonlan

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Using -std=c++0x or -std=gnu++0x doesn't work as it will only make std::unordered_set<> available, but not std::tr1::unordered_set<>. – Grumbel Aug 04 '09 at 16:13
@Grumbel, updated with an evil hack that will make it available in std::tr1 – bdonlan Aug 04 '09 at 16:37

jon hanson · Answer 4 · 2009-08-04T16:20:55.593

3

A tad hacky perhaps, but you could simply add the compiler tr1 directory to your include path.

edited Aug 04 '09 at 16:20

answered Aug 04 '09 at 16:08

jon hanson

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score 2 · Answer 5 · answered Aug 04 '09 at 16:09

2

If under Windows, add the 'tr1' directory to the system path. Then #include <memory> should work.

answered Aug 04 '09 at 16:09

John Dibling

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do compilers on windows use the system path as well as the include path when resolving includes? – jon hanson Aug 04 '09 at 16:22

score 2 · Answer 6 · answered Sep 21 '09 at 18:44

2

I asked myself the same question. Unfortunately, the technical report doesn't say how the headers should be included. It only defines that the extensions should be in the ::std::tr1 namespace.

answered Sep 21 '09 at 18:44

sellibitze

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How does one include TR1?

6 Answers6

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