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[WIP] Fix ArrayView bool conversion #43

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[WIP] Fix ArrayView bool conversion #43

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2 changes: 1 addition & 1 deletion src/Corrade/Containers/Array.h
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Original file line number Diff line number Diff line change
Expand Up @@ -328,7 +328,7 @@ class Array {
/** @brief Whether the array is non-empty */
/* Disabled on MSVC <= 2017 to avoid ambiguous operator+() when doing
pointer arithmetic. */
explicit operator bool() const { return _data; }
explicit operator bool() const { return _size; }
#endif

/**
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4 changes: 2 additions & 2 deletions src/Corrade/Containers/ArrayView.h
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Expand Up @@ -148,7 +148,7 @@ template<class T> class ArrayView {
/** @brief Whether the array is non-empty */
/* Disabled on MSVC <= 2017 to avoid ambiguous operator+() when doing
pointer arithmetic. */
explicit operator bool() const { return _data; }
explicit operator bool() const { return _size; }
#endif

/** @brief Conversion to array type */
Expand Down Expand Up @@ -497,7 +497,7 @@ template<std::size_t size_, class T> class StaticArrayView {
/** @brief Whether the array is non-empty */
/* Disabled on MSVC <= 2017 to avoid ambiguous operator+() when doing
pointer arithmetic. */
explicit operator bool() const { return _data; }
constexpr explicit operator bool() const { return size_; }
#endif

/** @brief Conversion to array type */
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7 changes: 7 additions & 0 deletions src/Corrade/Containers/StaticArray.h
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Expand Up @@ -212,6 +212,13 @@ template<std::size_t size_, class T> class StaticArray {
/** @brief Moving is not allowed */
StaticArray<size_, T>& operator=(StaticArray<size_, T>&&) = delete;

#ifndef CORRADE_MSVC2017_COMPATIBILITY
/** @brief Whether the array is non-empty */
/* Disabled on MSVC <= 2017 to avoid ambiguous operator+() when doing
pointer arithmetic. */
constexpr explicit operator bool() const { return size_; }
#endif

/**
* @brief Convert to @ref ArrayView
*
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19 changes: 15 additions & 4 deletions src/Corrade/Containers/Test/ArrayViewTest.cpp
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Expand Up @@ -43,6 +43,7 @@ struct ArrayViewTest: TestSuite::Tester {
void constructVoid();

void convertBool();
void convertBoolNullptr();
void convertPointer();
void convertConst();
void convertVoid();
Expand Down Expand Up @@ -75,6 +76,7 @@ ArrayViewTest::ArrayViewTest() {
&ArrayViewTest::constructVoid,

&ArrayViewTest::convertBool,
&ArrayViewTest::convertBoolNullptr,
&ArrayViewTest::convertPointer,
&ArrayViewTest::convertConst,
&ArrayViewTest::convertVoid,
Expand Down Expand Up @@ -202,6 +204,15 @@ void ArrayViewTest::convertBool() {
CORRADE_VERIFY(!(std::is_convertible<VoidArrayView, int>::value));
}

void ArrayViewTest::convertBoolNullptr() {
/* Zero-sized slice of an array should convert to false, while three-item
array starting at 0 should convert to true. The documentation says
it returns true if nonempty. */
int a[7];
CORRADE_VERIFY(!(ArrayView{a, 0}));
CORRADE_VERIFY((ArrayView{nullptr, 5}));
}

void ArrayViewTest::convertPointer() {
int a[7];
ArrayView b = a;
Expand Down Expand Up @@ -321,22 +332,22 @@ void ArrayViewTest::sliceNullptr() {
ArrayView a{nullptr, 5};

ArrayView b = a.prefix(nullptr);
CORRADE_VERIFY(!b);
CORRADE_VERIFY(!b.begin());
CORRADE_COMPARE(b.size(), 0);

ArrayView c = a.suffix(nullptr);
CORRADE_VERIFY(!c);
CORRADE_VERIFY(!c.begin());
CORRADE_COMPARE(c.size(), 5);

int data[5];
ArrayView d{data};

ArrayView e = d.prefix(nullptr);
CORRADE_VERIFY(!e);
CORRADE_VERIFY(!e.begin());
CORRADE_COMPARE(e.size(), 0);

ArrayView f = d.suffix(nullptr);
CORRADE_VERIFY(!f);
CORRADE_VERIFY(!f.begin());
CORRADE_COMPARE(f.size(), 0);
}

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15 changes: 14 additions & 1 deletion src/Corrade/Containers/Test/StaticArrayViewTest.cpp
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Expand Up @@ -41,6 +41,7 @@ struct StaticArrayViewTest: TestSuite::Tester {
void constructConst();

void convertBool();
void convertBoolNullptr();
void convertPointer();
void convertConst();
void convertVoid();
Expand Down Expand Up @@ -70,6 +71,7 @@ StaticArrayViewTest::StaticArrayViewTest() {
&StaticArrayViewTest::constructConst,

&StaticArrayViewTest::convertBool,
&StaticArrayViewTest::convertBoolNullptr,
&StaticArrayViewTest::convertPointer,
&StaticArrayViewTest::convertConst,
&StaticArrayViewTest::convertVoid,
Expand Down Expand Up @@ -158,10 +160,21 @@ void StaticArrayViewTest::constructConst() {
void StaticArrayViewTest::convertBool() {
int a[7];
CORRADE_VERIFY(StaticArrayView<5>{a});
CORRADE_VERIFY(!StaticArrayView<5>{});
/** @todo ISO C++ forbids zero-side array, can't really test */
//CORRADE_VERIFY(StaticArrayView<0>{});
CORRADE_VERIFY(!(std::is_convertible<StaticArrayView<5>, int>::value));
}

void StaticArrayViewTest::convertBoolNullptr() {
/* Zero-sized slice of an array should convert to false, while three-item
array starting at 0 should convert to true. The documentation says
it returns true if nonempty. */
/** @todo ISO C++ forbids zero-side array, can't really test */
//int a[7];
//CORRADE_VERIFY(!StaticArrayView<5>{a}.slice<0>(1));
CORRADE_VERIFY(StaticArrayView<5>{nullptr});
}

void StaticArrayViewTest::convertPointer() {
int a[7];
StaticArrayView<7> b = a;
Expand Down