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Questions tagged [tr1]

TR1 - C++ Technical Report 1, proposed extensions to the C++ standard library

The Technical Report on C++ Library Extensions (a.k.a ISO/IEC TR 19768) defined a number of new library components for C++, many taken from the Boost project. Nearly all the components in TR1 were included in the C++ 2011 standard.

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Can tr1::function swallow return values?

The boost::function FAQ item 3 specifically addresses the scenario I am interested in: Why are there workarounds for void returns? C++ allows them! Void returns are permitted by the C++ standard, as in this code snippet: void f(); void g() {…
Chris
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returning a 'pointer' which is required to be held by a smart pointer

I have a project which I would like to make more use of smart pointers. Overall, I have been successful in this goal. However, I've come across one things which I'm not sure what the "best practice" is. Basically I would like to return a "pointer"…
Evan Teran
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shared_ptr in std::tr1

I am working on a platform with a gcc compiler however boost cannot compile on it. I am wondering what is the proper way to include the shared_ptr in std:tr1 on gcc? the file i looked in said not to include it directly, from what i can tell no other…
user34537
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The difference between python dict and tr1::unordered_map in C++

I have a question related to understanding of how python dictionaries work. I remember reading somewhere strings in python are immutable to allow hashing, and it is the same reason why one cannot directly use lists as keys, i.e. the lists are…
none
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What will happen to namespace tr1 when c++ xx is approved?

I'm writing some stuff using the tr1 namespace in VS2008. What will happen when C++xx becomes ratified? Has this happened before with other C++ revisions? Will the tr1 stuff still work or will I have to change all of my include? I realize that I'm…
Steve
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C++ TR1: how to use the normal_distribution?

I'm trying to use the C++ STD TechnicalReport1 extensions to generate numbers following a normal distribution, but this code (adapted from this article): mt19937 eng; eng.seed(SEED); normal_distribution dist; // XXX if I use the one…
puccio
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Comparing std::function<>

Is it possible to somehow compare two std::tr1::function<> objects? What if I have a collection of function objects and want to add and remove event handlers? Adding is trivial, but finding the one to be removed seems to be…
Marc Andreson
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Using C++ classes like function that may be defined in several different locations

Between C++0x, C++03 TR1 and boost some things like function and bind can be defined in 3 different places depending on the compiler, eg for VC pre VC9 feature pack you have the boost versions, then you get them in but in the std::tr1:: namespace,…
Fire Lancer
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On the initialization of std::array

Let's say you have a c++0x std::array member of a template class and you want to initialize it by means of a constructor that takes a couple of iterators: template class Test { public: template …
Nicola Bonelli
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Determine compile-time existence of include files in C++

I'm trying to write some portable C++ library code that will initially rely on Boost.Regex, and then move to TR1 as compilers support it, and eventually to the C++0x specification after things get moved from the std::tr1 namespace to std. Here is…
Zac
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How to use tr1 with Visual Studio 2010 (tr1::function)?

How does one start using the tr1 features of Visual Studio 2010? For a more specific case, I require the std::tr1::function. I tried including #include which reports as missing, while #include includes fine, but when I…
Speed
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Why some include files only reside in tr1?

When I try to include things like it fails and says the file doesn't exist, while when I try to include it works. however, the include files that are present also in c++03 are found, and are c++11 (like …
Daniel
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Is there a match_partial in C++11 Regular Expressions?

I read through n1429 with the section The algorithms regex_match and regex_search both support a feature not commonly seen in regular expression libraries: a partial match. When the flag std::regex_constants::match_partial is set in the flags…
towi
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std::regex equivalent of '/g' global modifier

In Perl, I can do this: $text = '1747239'; @matches = ($text =~ m/(\d)/g); # @matches now contains ('1', '7', '4', '7', '2', '3', '9') Using C++ regex matching, what's the best way to replicate this behaviour so that I get a match set including…
user159335
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R-value inserts don't work for unordered_map

I'm using the latest available GCC build from repository. I decided to use it because some additional C++0x features. However now I stuck with something what supposes to work - I want to add new element to map via r-value. Simplified code, which…
Goofy
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