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C++26: Structured Bindings in Conditions(sandordargo.com)
22 points by jandeboevrie 3 days ago | 4 comments
Panzerschrek 3 days ago | parent [-]

> if (const auto& [is_successful, error_message] = foo(n))

I don't like it. It's hard to reason what exactly serves as condition variable.

daemin 3 days ago | parent | next [-]

Should probably make it explicit in this case, something like: if (const auto& [is_successful, error_message] = foo(n); is_successful)

In a more normal scenario you'd expect to use std::expected here rather than a custom struct with an operator bool.

addaon 3 days ago | parent | prev | next [-]

The return value of foo(n), converted to bool, acts as the condition variable…

porise 2 days ago | parent | prev [-]

Yeah I wouldn't like this in a code review. Add one more line of code so I don't have to investigate foo().

That's my fundamental gripe with C++

int i = 0;

function_0(i,...);

...

function_9(i,...);

which one changes i? It's not obvious in a code review due to default mutable references.