No, there’s no such guarantee. It’s unspecified according to the C++ standard. Bjarne Stroustrup also says it explicitly in “The C++ Programming Language” 3rd edition section 6.2.2, with some reasoning: Better code can be generated in the absence of restrictions on expression evaluation order Although technically this refers to an earlier part of the same … Read more
The main function must be declared as a non-member function in the global namespace. This means that it cannot be a static or non-static member function of a class, nor can it be placed in a namespace (even the unnamed namespace). The name main is not reserved in C++ except as a function in the … Read more
The short answer: Yes but is not recommended. The long answer: It depends on what you call valid… [ECMA-404][1] “The JSON Data Interchange Syntax” doesn’t say anything about duplicated names (keys). However, [RFC 8259][2] “The JavaScript Object Notation (JSON) Data Interchange Format” says: The names within an object SHOULD be unique. In this context SHOULD … Read more
Yes it’s inherited from C. The function: void foo ( char a[100] ); Will have the parameter adjusted to be a pointer, and so becomes: void foo ( char * a ); If you want that the array type is preserved, you should pass in a reference to the array: void foo ( char (&a)[100] … Read more
PDF versions of the standard As of 1st September 2014 March 2022, the best locations by price for the official C and C++ standards documents in PDF seem to be: C++20 – ISO/IEC 14882:2020: 212 CAD (about $165 US) from csagroup.org C++17 – ISO/IEC 14882:2017: $90 NZD (about $65 US) from Standards New Zealand C++14 … Read more
[*] (Background: I have some experience implementing C and C++ compilers.) Variable-length arrays in C99 were basically a misstep. In order to support VLAs, C99 had to make the following concessions to common sense: sizeof x is no longer always a compile-time constant; the compiler must sometimes generate code to evaluate a sizeof-expression at runtime. … Read more
The rules (which did not change in C++11): Reserved in any scope, including for use as implementation macros: identifiers beginning with an underscore followed immediately by an uppercase letter identifiers containing adjacent underscores (or “double underscore”) Reserved in the global namespace: identifiers beginning with an underscore Also, everything in the std namespace is reserved. (You … Read more
Yes, see here: http://expath.org/modules/http-client/ This module defines a set of functions to send HTTP & HTTPS requests and handle responses. This is a quite low-level functionality, allowing one to deal with most aspects of the HTTP protocol (redirections, headers, body contents, multipart…), while integrating smoothly within the XPath Data Model.
Firstly, a common mistake in reading 8.5.3p5 is to miss that it has two top level bullet points. You may have accidentally misread the final occurence of “Otherwise” as a third bullet point – but it is in fact a subpart of the second bullet point (also starting Otherwise). char a=”a”; char* p = &a; … Read more