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General: Make use of std::nullopt where applicable

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Allows some implementations to avoid completely zeroing out the internal
buffer of the optional, and instead only set the validity byte within
the structure.

This also makes it consistent how we return empty optionals.
This commit is contained in:
Lioncash 2020-09-22 17:31:53 -04:00
parent f3b0c1b4b5
commit e457001dce
17 changed files with 60 additions and 59 deletions
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6
src/video_core/memory_manager.cpp
View file

@ -58,7 +58,7 @@ void MemoryManager::Unmap(GPUVAddr gpu_addr, std::size_t size) {
std::optional<GPUVAddr> MemoryManager::AllocateFixed(GPUVAddr gpu_addr, std::size_t size) {
for (u64 offset{}; offset < size; offset += page_size) {
if (!GetPageEntry(gpu_addr + offset).IsUnmapped()) {
return {};
return std::nullopt;
}
}
@ -135,13 +135,13 @@ std::optional<GPUVAddr> MemoryManager::FindFreeRange(std::size_t size, std::size
}
}
return {};
return std::nullopt;
}
std::optional<VAddr> MemoryManager::GpuToCpuAddress(GPUVAddr gpu_addr) const {
const auto page_entry{GetPageEntry(gpu_addr)};
if (!page_entry.IsValid()) {
return {};
return std::nullopt;
}
return page_entry.ToAddress() + (gpu_addr & page_mask);