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C++20 is a version of the ISO/IEC 14882 standard for the C++ programming language. ... allow pack expansions in lambda init-capture; string literals as template ...
C++11 allowed lambda functions to deduce the return type based on the type of the expression given to the return statement. C++14 provides this ability to all functions. It also extends these facilities to lambda functions, allowing return type deduction for functions that are not of the form return expression;.
C++17 is a version of the ISO/IEC 14882 standard for the ... New rules for auto deduction from braced-init-list [7 ... Lambda expressions can capture "*this" by value
As of the 2011 revision, the C++ language also supports closures, which are a type of function object constructed automatically from a special language construct called lambda-expression. A C++ closure may capture its context either by storing copies of the accessed variables as members of the closure object or by reference.
Here, attempting to use a non-class type in a qualified name (T::foo) results in a deduction failure for f<int> because int has no nested type named foo, but the program is well-formed because a valid function remains in the set of candidate functions.
The C++ standard library provides several levels of exception safety (in decreasing order of safety): [8]. No-throw guarantee, also known as failure transparency: Operations are guaranteed to succeed and satisfy all requirements even in exceptional situations.
Lambda lifting is a meta-process that restructures a computer program so that functions are defined independently of each other in a global scope.
The term variable capture is somewhat misleading, because all namespaces are vulnerable to unwanted capture, including the operator and function namespace, the tagbody label namespace, catch tag, condition handler and restart namespaces. Variable capture can introduce software defects. This happens in one of the following two ways: