June 22, 2013 Passing Appender by value | ||||
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I just learned today that passing Appender by value does not have the semantics I thought it would: ----- import std.array; import std.stdio; void call(Appender!(int[]) buffer) { buffer.put(1); } void main() { Appender!(int[]) buffer; writeln(buffer.data); // writes [], it's empty } ----- Is this a bug? If not, shouldn't we introduce a disabled copy constructor to force passing Appender by ref to functions to avoid this type of user bug? I can't see how the current behavior is useful to anyone. |
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