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Latest vs2019 C++17, LLVM vs MSVC compilers (64-bit): sequential vs parallel computation test -> MSVC better? So using the same test C++17 code with two different release targets (both optimized for speed), I get similar results (even if often a bit better with MSVC) except for sequential sums. BUT: LLVM performed significantly badly (almost 3x slower) only in sequential testing but having decent performance for non-parallel code matters especially in the cases where small datasets are used (i.e. <10000). 1. LLVM Testing sum with 50000000 doubles... Sum = 1.07363e+17 Seq sum : Avg Time: 43.8106ms Sum = 1.07363e+17 Par sum : Avg Time: 8.84363ms &#x200B; Testing sort with 50000000 doubles... Serial: Lowest: 32 Highest: 4.29497e+09 Time: 4521.465800ms Parallel: Lowest: 32 Highest: 4.29497e+09 Time: 689.966600ms ConcRT: Lowest: 32 Highest: 4.29497e+09 Time: 643.165200ms 2) MSVC Testing sum with 50000000 doubles... Sum = 1.07366e+17 Seq sum : Avg Time: 15.8686ms Sum = 1.07366e+17 Par sum : Avg Time: 8.83388ms Testing (sort) with 50000000 doubles... concurrent transform duration: 29.250000 ms Serial: Lowest: 1 Highest: 4.29497e+09 Time: 4351.072500ms Parallel: Lowest: 1 Highest: 4.29497e+09 Time: 647.184100ms ConcRT: Lowest: 1 Highest: 4.29497e+09 Time: 595.211400ms The code I wrote for the sum is using the more modern std::reduce() instead of std::accumulate() functions so that I can compare sequential and parallel runs with the same code and the same machine (code runs multiple times then gets averaged). timeNow(startTime); for (int i = 0; i < iterationCount10; ++i) { sum = std::reduce(doubles.begin(), doubles.end()); } timeNow(endTime); printf("Sum = %g\n", sum); print_timing("Seq sum ", iterationCount10, startTime, endTime); timeNow(startTime); for (auto i = 0; i < iterationCount10; ++i) { // WITH EXECUTION POLICIES sum = std::reduce(std::execution::par, doubles.begin(), doubles.end()); } timeNow(endTime); printf("Sum = %g\n", sum); print_timing("Par sum ", iterationCount10, startTime, endTime); Could someone confirm this on vs2019 16.9.3? PS: I use the stock LLVM compiler provided by the VS2019 installer, so no special compiler version there. https://redd.it/n3i6o9 @r_cpp

Q. C++ Developer Jobs I'm not looking for a job opportunity, as I'm 14 years old, however, I was curious what sorts of jobs I could get working in the industry with the C++ programming language, alongside the average salary. https://redd.it/n3c053 @r_cpp

Renaming *_default_init to *_for_overwrite https://wg21.link/P1973R1 https://redd.it/n2y8bq @r_cpp

Surprising rvalue ref I thought should be a forwarding ref I was playing with the idea of using the pipe operator to operate on std::optional, functional style and came across a rvalue ref that I was absolutely sure should be a forwarding ref (using latest msvc and c++20) #include <concepts> #include <optional> template <typename T, typename F, typename U = std::invoke_result_t<F, T>> std::optional<U> operator|(std::optional<T> && opt, F && f) { if (!opt) return std::nullopt; return std::invoke(std::forward<F>(f), opt) } int main() { std::optional<int> i1(1); std::optional<int> i2(2); auto square = [](auto i) { return i i; }; auto r1 = std::move(o1) | square; auto r2 = o2 | square; // Error: no matching overload of '|' } I was assuming that std::optional<T> was involved in templating/type inference and therefore would be a forwarding ref and accept both lvalue and rvalue. Is this a gotcha or is there something in the rules that talk about this? https://redd.it/n2fqsn @r_cpp

function at all if not strictly needed. * Rule 9: public libraries imply a public commitment to stability. This rule enforces ABI stability on public library interfaces. * Rule 10: this rule is needed in order to allow existing standard library implementations to remain incompatible with each other. * Rule 10: this rule also 'breaks' existing systems that already use standard library types in their public interface. I'd argue this is a feature. * Rules 10-13: these rules make it clear which types offer ABI stability, and which types don’t. Any types that aren't explicitly stable are fair game for ABI-incompatible modification by the standard or the implementation. * Rule 11 & 12: these are very common types in DLL interfaces. It may not be the perfect solution for all types ever, but it does solve 99% of the problems in existing interfaces. # Tentative syntax Library code could be marked by having, at the top of each source file, a statement such as: public library libname; For modules this can be integrated into the module system: export public library module libname; All code below this statement would by definition be part of the library. The presence of the library keyword changes the meaning of existing source as follows: any symbol that was externally visible before, is now only visible within the library itself. To export a symbol from the library additional syntax is needed: export lib myfunc; // exported from library, part of its public API. A stable type could be marked with a context-sensitive keyword (similar to `final`): struct foo stable {}; # FAQ Q: Doesn’t this rely entirely on the honour system when it comes to stability? A: Yes, it does. The primary advantage is in making it clear which objects can be used in public APIs and which cannot. This should hopefully assist in freeing the ABI-deadlock currently in force in the C++ standards committee. Q: What if I absolutely must transport a standard library type in my interface? A: Use a private library, or use an opaque pointer to the non-stable class and provide access functions as part of your library. https://redd.it/n2jmsx @r_cpp

Thoughts on adding 'libraries' as a language concept Both modules and translation units offer two types of linkage: internal (only within one TU) and external (visible to all the world). This post argues that we need a third type of linkage: library-internal, for symbols that are strictly internal to a library, but nonetheless used in multiple TUs. I propose a small set of rules, discuss advantages, and suggest a possible syntax. A library, in this context, can either be static or dynamic. # Proposed new rules 1. Code that is compiled as part of a library is syntactically marked as such. Nothing changes for existing code without such marking. 2. A library can be public or private. Public libraries are assumed to be shared with other people who may not be able to recompile your library, and as such require ABI stability. Private libraries are assumed to be compiled and used by a single entity and can always be recompiled as part of a "compile the world" operation. 3. Symbols intended to be exported from the library are syntactically marked in the source. 4. The compiler is free to assume that all translation units that are linked together to form a library are compiled with the same compiler, flags, and environment *(of course you can, for example, create both debug and release builds of a library, but you can't link together some object files from a release build with some object files from a debug build. The goal of these guarantees is to make more aggressive optimisation possible)*. 5. A “stable” type is a type that is guaranteed to never change for a platform (perhaps this definition is the wrong way around, and should read "a platform is defined as an environment where the stable types never change"). 6. All fundamental types are stable *(this is not to say they are the same everywhere, just that for a given platform they never change. Together with the previous rule this also implies that those types are identical between compilers for that platform).* 7. Standard layout types can be marked as being stable. This implies a very strong commitment to never change the definition of this type. 8. If a standard layout type contains other standard layout types (either as members or as part of an inheritance chain), it can only be marked as stable if all constituent types are also stable. 9. In public libraries, only stable types can be used by symbols marked as “for export from the library” (i.e. we rule out non-stable variables and functions using non-stable arguments in the public interface of the library). 10. None of the types currently in the standard library (other than the fundamental types) are stable. Thus, none of these types can be exported in the interface of a public library, either directly or as part of a larger object. 11. A new stable type, `std::stable::string`, is added to the standard library. Its goal is to allow clean exchange of string data over library interfaces. 12. A new stable type, `std::stable::vector`, is added to the standard library. Its goal is to allow clean exchange of dynamic array data over library interfaces. 13. The implementation of any `std::stable` objects is prescribed by the standard and therefore identical between compilers (for the same platform, obviously). The `std::stable` objects do not need to have a complete set of member functions. It’s sufficient if they can be efficiently moved to and from the existing `std::string` and `std::vector`, respectively. They exist purely as a reliable and efficient transport medium. # Advantages conferred by these rules * Rule 3: these markings can standardize equivalent compiler-specific declarations such as `__declspec(dllexport)`. * Rules 3 & 4: symbols not marked for export from the library are therefore guaranteed to be internal to the library, and thus to be compiled with the same compiler, flags, and environment. The compiler is therefore free to deviate from ABI rules if this leads to more optimal code. Examples of such optimisations would be to pass `std::unique_ptr` in a register, or to not instantiate an inlined

Thoughts on adding 'libraries' as a language concept Both modules and translation units offer two types of linkage: internal (only within one TU) and external (visible to all the world). This post argues that we need a third type of linkage: library-internal, for symbols that are strictly internal to a library, but nonetheless used in multiple TUs. I propose a small set of rules, discuss advantages, and suggest a possible syntax. A library, in this context, can either be static or dynamic. # Proposed new rules 1. Code that is compiled as part of a library is syntactically marked as such. Nothing changes for existing code without such marking. 2. A library can be public or private. Public libraries are assumed to be shared with other people who may not be able to recompile your library, and as such require ABI stability. Private libraries are assumed to be compiled and used by a single entity and can always be recompiled as part of a "compile the world" operation. 3. Symbols intended to be exported from the library are syntactically marked in the source. 4. The compiler is free to assume that all translation units that are linked together to form a library are compiled with the same compiler, flags, and environment (of course you can, for example, create both debug and release builds of a library, but you can't link together some object files from a release build with some object files from a debug build. The goal of these guarantees is to make more aggressive optimisation possible). 5. A “stable” type is a type that is guaranteed to never change for a platform (perhaps this definition is the wrong way around, and should read "a platform is defined as an environment where the stable types never change"). 6. All fundamental types are stable (this is not to say they are the same everywhere, just that for a given platform they never change. Together with the previous rule this also implies that those types are identical between compilers for that platform). 7. Standard layout types can be marked as being stable. This implies a very strong commitment to never change the definition of this type. 8. If a standard layout type contains other standard layout types (either as members or as part of an inheritance chain), it can only be marked as stable if all constituent types are also stable. 9. In public libraries, only stable types can be used by symbols marked as “for export from the library” (i.e. we rule out non-stable variables and functions using non-stable arguments in the public interface of the library). 10. None of the types currently in the standard library (other than the fundamental types) are stable. Thus, none of these types can be exported in the interface of a public library, either directly or as part of a larger object. 11. A new stable type, std::stable::string, is added to the standard library. Its goal is to allow clean exchange of string data over library interfaces. 12. A new stable type, std::stable::vector, is added to the standard library. Its goal is to allow clean exchange of dynamic array data over library interfaces. 13. The implementation of any std::stable objects is prescribed by the standard and therefore identical between compilers (for the same platform, obviously). The std::stable objects do not need to have a complete set of member functions. It’s sufficient if they can be efficiently moved to and from the existing std::string and std::vector, respectively. They exist purely as a reliable and efficient transport medium. # Advantages conferred by these rules Rule 3: these markings can standardize equivalent compiler-specific declarations such as `__declspec(dllexport)`. Rules 3 & 4: symbols not marked for export from the library are therefore guaranteed to be internal to the library, and thus to be compiled with the same compiler, flags, and environment. The compiler is therefore free to deviate from ABI rules if this leads to more optimal code. Examples of such optimisations would be to pass std::unique_ptr in a register, or to not instantiate an inlined

bitpacker - type safe and low-boilerplate bit level serialization using modern C++. Compatible with python bitstruct. https://github.com/CrustyAuklet/bitpacker https://redd.it/n2v0vu @r_cpp

define data type for street address in vector Hi, due to address field will contain integer and string, do anyone could give me suggestion which type of data type should I use for street address in vector? Thanks https://redd.it/n2rj5c @r_cpp

Enabling C/C++ compilation in an application. Hello, I want to include a c compiler with my app (and possibly also a c++ compiler), so that the user can generate their own dynamic libraries. Does anybody have any suggestions on how to go about this? I am thinking including mingw, but I was wondering whether there is an alternative approach or a stripped down version. Ideally I would like to be able to support multiple platforms. Thank you! https://redd.it/n2mnnp @r_cpp

Ichor - A framework for combining dependency injection and thread safety with C++20 https://github.com/volt-software/Ichor https://redd.it/n2jjhz @r_cpp

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