C++26: String and String_view Improvements
C++26 introduces several improvements related to string_view, enhancing usability and performance when working with string-like objects. New constructors allow direct initialization of stringstreams and bitsets from string_views, avoiding unnecessary copies. Additionally, C++26 adds support for direct concatenation of strings and string_views using the operator+ overload.
- ▪C++26 adds new constructors to std::stringstream that accept std::string_view, eliminating the need for manual conversion to std::string.
- ▪The std::bitset class now supports direct construction from std::string_view, removing the requirement for temporary strings or unsafe data() access.
- ▪P2591R5 introduces operator+ overloads for concatenating std::string and std::string_view in both orders, improving ergonomics and safety.
- ▪These changes are additive and do not break existing code, with some already available in recent Clang versions.
- ▪The improvements aim to reduce unnecessary allocations and streamline interfaces involving string-like parameters.
Opening excerpt (first ~120 words) tap to expand
Let’s continue our exploration of C++26 improvements. Today we focus on string_view. Some types got new constructors accepting string_views, and concatenation of strings and string_views just got easier.But let’s start with a brief reminder of what a string_view is.Reminder: the role of string_viewstd::string_view was introduced in C++17 and its purpose is to provide read-only access to a string-like object. It can often replace const string& parameters and offers a significant performance gain.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Sandor Dargo’s Blog.
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