I’m compiling an UnrealEngine 5.3 project that includes pytorch headers (git cloned the trunk this month). My system is Win 11, MSVS 17.11.5, and file from “include/c10/util/Lazy.h” produces these errors:
| Error | C2988 | unrecognizable template declaration/definition | RASample | c:\src\pytorch222\torch\include\c10\util\Lazy.h | 32 | ||
|---|---|---|---|---|---|---|---|
| Error | C2059 | syntax error: ‘!’ | RASample | c:\src\pytorch222\torch\include\c10\util\Lazy.h | 32 | ||
| Error | C2334 | unexpected token(s) preceding ‘{’; skipping apparent function body | RASample | c:\src\pytorch222\torch\include\c10\util\Lazy.h | 32 | ||
| Error | C2059 | syntax error: ‘)’ | RASample | c:\src\pytorch222\torch\include\c10\util\Lazy.h | 32 | ||
| Error | C2334 | unexpected token(s) preceding ‘{’; skipping apparent function body | RASample | c:\src\pytorch222\torch\include\c10\util\Lazy.h | 32 | ||
| … | |||||||
| Other errors are: | |||||||
| Error | C3861 | ‘value_’: identifier not found | RASample | c:\src\pytorch222\torch\include\c10\util\Lazy.h | 26 | ||
| Error | C3861 | ‘value_’: identifier not found | RASample | c:\src\pytorch222\torch\include\c10\util\Lazy.h | 22 | ||
| Error | C2065 | ‘value_’: undeclared identifier | RASample | c:\src\pytorch222\torch\include\c10\util\Lazy.h | 22 | ||
| … |
The problem is in the method:
template
T& ensure(const Factory& factory) {
if (T* value = value_.load(std::memory_order_acquire)) {
return value;
}
T value = new T(factory());
T* old = nullptr;
if (!value_.compare_exchange_strong(
old, value, std::memory_order_release, std::memory_order_acquire)) {
delete value;
value = old;
}
return *value;
}
I’ve configured UE build system to use cpp17 by using:
CppStandard = CppStandardVersion.Cpp17;
in the C# build config file.
Tried changing cpp version to 14 - can’t compile because of the missed “fold expression” feature of the cpp14.
Tried changing cpp version to 20 - the errors are the same as for the cpp version 17.
Does anyone can help resolving the errors that I have?