Web对于我的情况,阅读相同错误号的答案似乎很难解释。 请提供一些提示以纠正错误。 cannot return value referencing temporary value returns a value referencing data owned by the current functionrustc(E0515) lib.rs(91, 63): temporary value created here lib.rs(94, 11): returns a value referencing data owned by the current function [操场] [2] WebYou shouldn't return a reference to a temporary which is destroyed at the end of the line, nor a reference to a local which is destroyed at the end of the function. If you want to …
Strange warning from g++ "returning reference to temporary"
WebNov 19, 2024 · trait AsStr {fn as_str (& self)-> & str;} impl AsStr for & [u8] {fn as_str (& self)-> & str {unsafe {str:: from_utf8_unchecked (self)}}} fn foo (buf: & [u8])-> & str {unsafe {str:: … WebJun 30, 2024 · temporary, it is said that it creates temporary variable which is swapped instead of actual variable.., The problem is that a reference absolutely must refer to an actual object., So, if you return by reference then someone must create an object for that returned reference., Therefore if you can't find a matching object, it's not really … song to a seagull joni mitchell lyrics
lvalues references and rvalues references in C++ with Examples
Webcannot return reference to temporary value returns a reference to data owned by the current function And here I got completely blocked and got no Idea what to do. 26 33 Comments Best Add a Comment SCO_1 • 3 yr. ago &i32 is a Copy type and as such its 'dereference' is auto converted to a copy. WebThe non-const version doesn't involve the creation of a temporary, hence it is okay. Actually, you could also switch the const one to not doing that, but that would mean changing the return type to 'char* const&'. Uli -- [ See http://www.gotw.ca/resources/clcm.htm for info about ] [ comp.lang.c++.moderated. First … WebNov 19, 2024 · The other 3 examples not compiling is not surprising, they contain runtime code, so any reference to it will return a reference to a local variable. I think the suprising thing to folks is that the first example compiles. song to a seagull