Results for &#x201C;optional&#x201D;

Transform an optional value

Transform an optional value in a complete Rust program using the standard library.

Transpose an optional parsing result

Transpose an optional parsing result in a complete Rust program using the standard library.

JavaNumbers & dates

Use an optional fallback

Use Optional.orElse to provide a default for a missing Java value.

Java✓ Tested

Add context to a parsing failure

Add context to a parsing failure in a complete Rust program using the standard library.

Apply an operation to a variant’s active value

C++: A generic visitor lets the compiler check behavior for every possible alternative.

Capture configuration by value in a callable

C++: A value capture retains the value from lambda creation even if the original variable changes later.

Chain operations that may return None

Chain operations that may return None in a complete Rust program using the standard library.

Handle integer overflow without panicking

Handle integer overflow without panicking in a complete Rust program using the standard library.

Observe shared ownership without extending its lifetime

C++: A weak_ptr can be locked while an owner exists and becomes expired after the last owner is released.

Own one dynamically allocated value with unique_ptr

C++: make_unique allocates a value whose lifetime is tied to its owning smart pointer.

Propagate a parsing error with question mark

Propagate a parsing error with question mark in a complete Rust program using the standard library.

Provide a default for a missing value

Provide a default for a missing value in a complete Rust program using the standard library.