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Work around vs2013sp2-3 bug in skstd::unique_ptr.

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When compiling skstd::unique_ptr::compressed_base with the vc++ in
some intermediate service pack versions of Visual Studio 2013 the
compiler will crash with an internal compiler error. In the interest of
reducing headaches, work around this issue in skstd::unique_ptr until
std::unique_ptr can be used.

BUG=skia:4564

Review URL: https://codereview.chromium.org/1636503002
This commit is contained in:
bungeman 2016-01-25 13:00:33 -08:00 committed by Commit bot
parent 7869bbff26
commit 1fce5584cf
1 changed files with 24 additions and 17 deletions
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41
include/private/SkUniquePtr.h
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@ -48,7 +48,7 @@ public:
using deleter_type = D;
private:
template <typename B, bool = std::is_empty<B>::value /*&& !is_final<B>::value*/>
template <typename B, bool>
struct compressed_base : private B {
/*constexpr*/ compressed_base() : B() {}
/*constexpr*/ compressed_base(const B& b) : B(b) {}
@ -68,25 +68,29 @@ private:
void swap(compressed_base& that) /*noexcept*/ { SkTSwap(fb, that.fB); }
};
struct compressed_data : private compressed_base<deleter_type> {
// C++14 adds '&& !std::is_final<deleter_type>::value' to the bool condition.
// compressed_base_t exists and has this form to work around a bug in vs2013sp2-3
using compressed_base_t = compressed_base<deleter_type, std::is_empty<deleter_type>::value>;
struct compressed_data : private compressed_base_t {
pointer fPtr;
/*constexpr*/ compressed_data() : compressed_base<deleter_type>(), fPtr() {}
/*constexpr*/ compressed_data() : compressed_base_t(), fPtr() {}
/*constexpr*/ compressed_data(const pointer& ptr, const deleter_type& d)
: compressed_base<deleter_type>(d), fPtr(ptr) {}
: compressed_base_t(d), fPtr(ptr) {}
template <typename U1, typename U2, typename = enable_if_t<
is_convertible<U1, pointer>::value && is_convertible<U2, deleter_type>::value
>> /*constexpr*/ compressed_data(U1&& ptr, U2&& d)
: compressed_base<deleter_type>(std::forward<U2>(d)), fPtr(std::forward<U1>(ptr)) {}
: compressed_base_t(std::forward<U2>(d)), fPtr(std::forward<U1>(ptr)) {}
/*constexpr*/ pointer& getPointer() /*noexcept*/ { return fPtr; }
/*constexpr*/ pointer const& getPointer() const /*noexcept*/ { return fPtr; }
/*constexpr*/ deleter_type& getDeleter() /*noexcept*/ {
return compressed_base<deleter_type>::get();
return compressed_base_t::get();
}
/*constexpr*/ deleter_type const& getDeleter() const /*noexcept*/ {
return compressed_base<deleter_type>::get();
return compressed_base_t::get();
}
void swap(compressed_data& that) /*noexcept*/ {
compressed_base<deleter_type>::swap(static_cast<compressed_base<deleter_type>>(that));
compressed_base_t::swap(static_cast<compressed_base_t>(that));
SkTSwap(fPtr, that.fPtr);
}
};
@ -221,8 +225,7 @@ public:
using deleter_type = D;
private:
template <typename B, bool = std::is_empty<B>::value /*&& !is_final<B>::value*/>
struct compressed_base : private B {
template <typename B, bool> struct compressed_base : private B {
/*constexpr*/ compressed_base() : B() {}
/*constexpr*/ compressed_base(const B& b) : B(b) {}
/*constexpr*/ compressed_base(B&& b) : B(std::move(b)) {}
@ -241,25 +244,29 @@ private:
void swap(compressed_base& that) /*noexcept*/ { SkTSwap(fb, that.fB); }
};
struct compressed_data : private compressed_base<deleter_type> {
// C++14 adds '&& !std::is_final<deleter_type>::value' to the bool condition.
// compressed_base_t exists and has this form to work around a bug in vs2013sp2-3
using compressed_base_t = compressed_base<deleter_type, std::is_empty<deleter_type>::value>;
struct compressed_data : private compressed_base_t {
pointer fPtr;
/*constexpr*/ compressed_data() : compressed_base<deleter_type>(), fPtr() {}
/*constexpr*/ compressed_data() : compressed_base_t(), fPtr() {}
/*constexpr*/ compressed_data(const pointer& ptr, const deleter_type& d)
: compressed_base<deleter_type>(d), fPtr(ptr) {}
: compressed_base_t(d), fPtr(ptr) {}
template <typename U1, typename U2, typename = enable_if_t<
is_convertible<U1, pointer>::value && is_convertible<U2, deleter_type>::value
>> /*constexpr*/ compressed_data(U1&& ptr, U2&& d)
: compressed_base<deleter_type>(std::forward<U2>(d)), fPtr(std::forward<U1>(ptr)) {}
: compressed_base_t(std::forward<U2>(d)), fPtr(std::forward<U1>(ptr)) {}
/*constexpr*/ pointer& getPointer() /*noexcept*/ { return fPtr; }
/*constexpr*/ pointer const& getPointer() const /*noexcept*/ { return fPtr; }
/*constexpr*/ deleter_type& getDeleter() /*noexcept*/ {
return compressed_base<deleter_type>::get();
return compressed_base_t::get();
}
/*constexpr*/ deleter_type const& getDeleter() const /*noexcept*/ {
return compressed_base<deleter_type>::get();
return compressed_base_t::get();
}
void swap(compressed_data& that) /*noexcept*/ {
compressed_base<deleter_type>::swap(static_cast<compressed_base<deleter_type>>(that));
compressed_base_t::swap(static_cast<compressed_base_t>(that));
SkTSwap(fPtr, that.fPtr);
}
};