As per N4594 13.3.1.7p1, in copy-list-initialization, the compiler is required to consider an explicit constructor for overload resolution. These errors weren't caught in Visual Studio 2015, and could lead to crashes or undefined runtime behavior. Visual Studio 2017 correctly raises compiler errors related to object creation using initializer lists. For more information, see P0184R0 - Generalizing the Range-Based for Loop. This change enables end() to return a sentinel as used by ranges in range-v3 and the completed-but-not-quite-published Ranges Technical Specification. Range-based for loops no longer require that begin() and end() return objects of the same type. For more information, see P0188R0 - Wording for ] attribute. This attribute prevents the compiler from issuing warnings in such cases. In /std:c++17 mode and later, the ] attribute can be used in the context of switch statements as a hint to the compiler that the fall-through behavior is intended. For more information, see N3928: Extending static_assert, v2. The message parameter for static_assert is optional. For more information, see Relaxing constraints on constexpr functions. There's no longer a requirement that a constexpr non-static member function must be implicitly const. C++14: Extended constexprĮxpressions declared as constexpr are now allowed to contain certain kinds of declarations, if and switch statements, loop statements, and mutation of objects whose lifetime began within the constexpr expression evaluation. For more information, see Member initializers and aggregates. Beginning in C++14, aggregates may contain member initializers. C++14: NSDMI for aggregatesĪn aggregate is an array or a class that has: no user-provided constructor, no non-static data members that are private or protected, no base classes, and no virtual functions. For more information, see Expression SFINAE improvements in Visual Studio 2017 RC. It's required for template argument deduction and substitution where decltype and constexpr expressions may appear as template parameters. The compiler continues to improve its support for expression SFINAE. C++11: Expression SFINAE support in more libraries See Microsoft C/C++ language conformance for the current state of the compiler. However, the compiler still lacks a few features from the C++11 and C++98 standards. With support for generalized constexpr and non-static data member initialization (NSDMI) for aggregates, the MSVC compiler in Visual Studio 2017 is now complete for features added in the C++14 standard. Conformance improvements in Visual Studio 2017 RTW (version 15.0) For a complete list of previous conformance improvements, see Visual C++ What's New 2003 through 2015. For a guide to the changes in Visual Studio 2019, see C++ conformance improvements in Visual Studio 2019. For a guide to the changes in Visual Studio 2022, see C++ conformance improvements in Visual Studio 2022. This document lists the changes in Visual Studio 2017. To jump directly to the changes for a specific version, use list below In this article. This article lists the improvements by major release, then by version. Microsoft C/C++ in Visual Studio (MSVC) makes conformance improvements and bug fixes in every release.
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