Document number: N3607

Date: 2013-03-15

Making Non-modifying Sequence Operations More Robust

by Mike Spertus, Attila Pall

We propose adding overloads for std::equal, std::mismatch, and std::is_permutation to accept two ranges. When using these overloads, the caller does not need to separately check that the two ranges are of the same length.

Document number: N3606

Date: 2013-03-17

Extending std::search to use Additional Searching Algorithms

by Marshall Clow

Two additional search algorithms are proposed for inclusion into the standard: "Boyer-Moore" and "Boyer-Moore-Horspool". Additionally, the interface for the search objects is documented so that library implementers and end users can create their own search objects and use them with std::search.

Document number: N3605

Date: 2013-03-15

Member Initializers and Aggregates

by Ville Voutilainen

Bjarne Stroustrup and Richard Smith raised an issue about aggregate initialization and member-initializers not working together. This paper proposes to fix the issue by adopting Smith's proposed wording that removes a restriction that aggregates can't have member-initializers. 

Document number: N3604

Date: 2013-03-18

Centralized Defensive-Programming Support for Narrow Contracts

by John Lakos, Alexei Zakharov

In this proposal, we describe a centralized facility for supporting defensive runtime validation of function preconditions. What makes this overall approach ideally (and uniquely) suited for standardization is that it allows the application to (1) indicate coarsely (at compile time) the extent to which precondition checking should be enabled based on how much defensive overhead the application (as a whole) can afford, and (2) specify exactly (at runtime) what action is to be taken should a precondition violation be detected.

Document number: N3603

Date: 2013-03-17

A Three-Class IP Address Proposal

by Christopher Kohlhoff

This proposal describes a three-class design for IP address classes:

Document number: N3602

Date: 2013-03-14

Template Parameter Deduction for Constructors

by Mike Spertus

This paper proposes extending template parameter deduction for functions to constructors of template classes. The clearest way to describe the problem and solution is with some examples.

Document number: N3601

Date: 2013-03-17

Implicit Template Parameters

by Mike Spertus

The purpose of this example is to eliminate the need for the redundant template<typename T, T t> idiom. This idiom is widely used, with over 100k hits on Google.

Document number: N3600

Date: 2013-03-16

C++ Latches and Barriers

by Alasdair Mackintosh

We propose a set of commonly-used concurrency classes, some of which may be implemented using efficient lock-free algorithms where appropriate. This paper describes the latch and barrier classes.

Document number: N3599

Date: 2013-03-13

Literal Operator Templates for Strings

by Richard Smith

N2765 added the ability for users to define their own literal suffixes. Several forms of literal operators are available, with one notable omission: there is no template form of literal operator for character and string literals. N2750 justifies this restriction based on two factors:

• there may be demand for a raw form of string literal, in which

  "Hello, " L"Worl\u0044!"

  is distinguishable from

  L"Hello, World!"

  but this interacted badly with phases of translation, and
• no compelling use cases for this feature were known.

Neither of these is still true, and we now have evidence that a literal operator template for string literals would be valuable; indeed, in one codebase where literal operators are not yet permitted, this form of literal operator has been requested more frequently than any of the forms which C++11 permits.

Document number: N3598

Date: 2013-03-12

constexpr Member Functions and Implicit const

by Richard Smith

In C++11, constexpr member functions are implicitly const. This creates problems for literal class types which desire to be usable both within constant expressions and outside them...