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C++14
C++14 is a version of the ISO/IEC 14882 standard for the C++ programming language. It is intended to be a small extension over C++11, featuring mainly bug fixes and small improvements, and was replaced by C++17. Its approval was announced on August 18, 2014. C++14 was published as ISO/IEC 14882:2014 in December 2014.
Because earlier C++ standard revisions were noticeably late, the name "C++1y" was sometimes used instead until its approval, similarly to how the C++11 standard used to be termed "C++0x" with the expectation of its release before 2010 (although in fact it slipped into 2010 and finally 2011).
These are the features added to the core language of C++14.
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;.
In order to induce return type deduction, the function must be declared with auto as the return type, but without the trailing return type specifier in C++11:
If multiple return expressions are used in the function's implementation, then they must all deduce the same type.
Functions that deduce their return types can be forward declared, but they cannot be used until they have been defined. Their definitions must be available to the translation unit that uses them.
Recursion can be used with a function of this type, but the recursive call must happen after at least one return statement in the definition of the function:
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C++14
C++14 is a version of the ISO/IEC 14882 standard for the C++ programming language. It is intended to be a small extension over C++11, featuring mainly bug fixes and small improvements, and was replaced by C++17. Its approval was announced on August 18, 2014. C++14 was published as ISO/IEC 14882:2014 in December 2014.
Because earlier C++ standard revisions were noticeably late, the name "C++1y" was sometimes used instead until its approval, similarly to how the C++11 standard used to be termed "C++0x" with the expectation of its release before 2010 (although in fact it slipped into 2010 and finally 2011).
These are the features added to the core language of C++14.
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;.
In order to induce return type deduction, the function must be declared with auto as the return type, but without the trailing return type specifier in C++11:
If multiple return expressions are used in the function's implementation, then they must all deduce the same type.
Functions that deduce their return types can be forward declared, but they cannot be used until they have been defined. Their definitions must be available to the translation unit that uses them.
Recursion can be used with a function of this type, but the recursive call must happen after at least one return statement in the definition of the function: