| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | String: Add str_if_stable() as a const alternative to str() | Brad King | 2018-12-12 | 1 | -3/+24 |
| | | | | | | | | | | | | | | | | | The `str()` method must be non-const because it may need to internally mutate the representation of the string in order to have an owned `std::string` instance holding the exact string (not a superstring). This is inconvenient in contexts where we can ensure that no mutation is needed to get a `std::string const&`. Add a `str_if_stable() const` method that returns `std::string const*` so we can return `nullptr` if if mutation would be necessary to get a `std::string const&`. Add supporting `is_stable() const` and `stabilize()` methods to check and enforce stable availability of `std::string const&`. These can be used to create `String const` instances from which we can still get a `std::string const&` via `*str_if_stable()` by maintaining the stability invariant at runtime. | ||||
| * | String: Add a custom string type | Brad King | 2018-12-12 | 1 | -0/+131 |
| Create a `cm::String` type that holds a view of a string buffer and optionally shares ownership of the buffer. Instances can either borrow longer-lived storage (e.g. static storage of string literals) or internally own a `std::string` instance. In the latter case, share ownership with copies and substrings. Allocate a new internal string only on operations that require mutation. This will allow us to recover string sharing semantics that we used to get from C++98 std::string copy-on-write implementations. Such implementations are not allowed by C++11 so code our own in a custom string type instead. | |||||
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