Foreword

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This document was prepared by Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 22, Programming languages, their environments and system software interfaces.

This fifth edition cancels and replaces the fourth edition (ISO/IEC 14882:2014), which has been technically revised.

The main changes compared to the previous edition are as follows:

— expression evaluation order is specified in more cases
— removal of trigraphs
— adjustments to value categories resulting in copy elision being mandatory
— additional character and floating point literal syntaxes
— lambda expressions extended to permit capture of *this and use in constant expressions
— initializer statements for if and switch statements
— addition of constexpr if statements
— range-based for statement generalized to support heterogeneous begin and end types
— addition of structured bindings
— addition of inline variables
— list initialization extended to support enumerations and aggregates with base classes
— message in static_assert is now optional
— addition of nested namespace definition syntax
— extended support for attributes
— exception specifications are now part of function types
— template argument deduction is now supported for class templates
— addition of fold expressions
— pack expansion can be performed on using declarations
— permitted forms of template parameters and template arguments have been generalized
— dynamic allocation is supported for over-aligned types
— preprocessor can detect presence of header files with __has_include
— new utility functions, types, and templates in the standard library, including
- — an any type
- — an optional class template
- — a variant class template
- — a clamp function
- — a std::byte type
- — a not_fn function
- — a void_t alias template
- — conjunction, disjunction, and negation templates
- — an invoke function, and is_invocable and invoke_result type traits
- — an is_swappable type trait
— extended constant expression evaluation support in the standard library
— elementary conversion functions between strings and numeric types added
— constructors for pair and tuple are conditionally-explicit
— shared_ptrs of array types now supported
— additional algorithms for managing uninitialized memory
— addition of polymorphic memory resources
— addition of substring search facilities providing the Boyer-Moore and Boyer-Moore-Horspool search algorithms
— addition of variable templates for type traits
— addition of a non-owning string view template
— ability to splice elements between containers for maps and sets
— better support for element insertion in unique-key maps
— support for incomplete types in containers
— addition of parallel algorithms
— addition of sample algorithm
— addition of mathematical special functions, and gcd, lcm, and three-argument hypot functions
— addition of support for operations on file systems
— addition of shared mutexes and variadic lock guards
— removal of deprecated features

BS ISO/IEC 14882:2017

Programming languages. C++

Published:

31 Jan 2018

Withdrawn:

17 Dec 2020