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string_span.t.cpp
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//
// gsl-lite is based on GSL: Guidelines Support Library.
// For more information see https://github.com/gsl-lite/gsl-lite
//
// Copyright (c) 2015-2019 Martin Moene
// Copyright (c) 2019-2021 Moritz Beutel
// Copyright (c) 2015-2018 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "gsl-lite.t.hpp"
#include <sstream> // std::ostringstream
#include <string.h> // strlen()
#if gsl_HAVE( WCHAR )
# include <wchar.h> // wcslen()
#endif
using namespace gsl;
typedef string_span::index_type index_type;
template< typename T >
inline std::vector<T> vector_iota( int n )
{
std::vector<T> result;
for ( int i = 0; i < n; ++i )
result.push_back( static_cast<T>( i ) );
return result;
}
CASE( "string_span: Disallows construction of a string_span from a cstring_span (define gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS)" )
{
#if gsl_CONFIG( CONFIRMS_COMPILATION_ERRORS )
cstring_span sv = "hello";
string_span v2 = sv;
#endif
}
CASE( "string_span: Disallows construction of a string_span from a const std::string (define gsl_CONFIG_CONFIRMS_COMPILATION_ERRORS)" )
{
#if gsl_CONFIG( CONFIRMS_COMPILATION_ERRORS )
const std::string s = "hello, world";
string_span sv( s );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == s );
#endif
}
CASE( "string_span: Allows to default-construct" )
{
string_span s;
EXPECT( s.size() == index_type( 0 ) );
}
CASE( "string_span: Allows to construct from a nullptr (C++11)" )
{
#if gsl_HAVE( NULLPTR )
string_span v( nullptr );
cstring_span w( nullptr );
EXPECT( v.size() == index_type( 0 ) );
EXPECT( w.size() == index_type( 0 ) );
#else
EXPECT( !!"nullptr is not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a const C-string" )
{
cstring_span sv = "hello";
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == "hello" );
}
CASE( "string_span: Allows to construct a string_span from a non-const C-string and size" )
{
char s[] = "hello";
string_span sv( s, strlen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a string_span from a non-const C-string begin and end pointer" )
{
char s[] = "hello";
string_span sv( s, s + strlen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a string_span from a non-const C-array" )
{
char s[] = { 'w', 'o', 'r', 'l', 'd', '\0' };
string_span sv( s );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == "world" );
}
CASE( "string_span: Allows to construct a string_span from a non-const std::string" )
{
std::string s = "hello, world";
string_span sv( s );
EXPECT( sv.length() == 12u );
EXPECT( std::string( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a string_span from a non-const std::array (C++11)" )
{
#if gsl_HAVE( ARRAY )
std::array<char,6> arr = {{ 'w', 'o', 'r', 'l', 'd', '\0' }};
string_span sv( arr );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::equal( sv.begin(), sv.end(), arr.begin() ) );
#else
EXPECT( !!"std::array<> is not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to construct a string_span from a non-const container (std::vector)" )
{
#if gsl_HAVE( INITIALIZER_LIST )
std::vector<char> vec = { 'w', 'o', 'r', 'l', 'd', '\0' };
#else
std::vector<char> vec( 6, 'w' );
#endif
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
string_span sv( vec );
EXPECT( sv.length() == index_type( 6 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"(un)constrained construction from container is not available" );
#endif
}
CASE( "string_span: Allows to construct a string_span from a non-const container, via a tag (std::vector)" )
{
#if gsl_FEATURE_TO_STD( WITH_CONTAINER )
std::vector<char> vec = vector_iota<char>( 10 );
string_span sv( with_container, vec );
EXPECT( sv.length() == index_type( 10 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"with_container is not available (gsl_FEATURE_WITH_CONTAINER_TO_STD)" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a non-const C-string and size" )
{
char s[] = "hello";
cstring_span sv( s, strlen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a cstring_span from a non-const C-string begin and end pointer" )
{
char s[] = "hello";
cstring_span sv( s, s + strlen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a cstring_span from a non-const C-array" )
{
char s[] = { 'w', 'o', 'r', 'l', 'd', '\0' };
cstring_span sv( s );
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_COMPILER_MSVC_VERSION
EXPECT( sv.length() == index_type( 5 ) );
#elif gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
EXPECT( !!"Warning: Unconstrained span container constructor enabled: terminating '\0' included in span" );
EXPECT( sv.length() == index_type( 6 ) );
#else
EXPECT( sv.length() == index_type( 5 ) );
#endif
EXPECT( std::string( sv.data() ) == "world" );
}
CASE( "string_span: Allows to construct a cstring_span from a non-const std::string" )
{
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
std::string s = "hello, world";
cstring_span sv( s );
EXPECT( sv.length() == 12u );
EXPECT( std::string( sv.data() ) == s );
#else
EXPECT( !!"(un)constrained construction from container is not available" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a non-const std::array (C++11)" )
{
#if gsl_HAVE( ARRAY )
std::array<char,6> arr = {{ 'w', 'o', 'r', 'l', 'd', '\0' }};
cstring_span sv( arr );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::equal( sv.begin(), sv.end(), arr.begin() ) );
#else
EXPECT( !!"std::array<> is not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a non-const container (std::vector)" )
{
#if gsl_HAVE( INITIALIZER_LIST )
std::vector<char> vec = { 'w', 'o', 'r', 'l', 'd', '\0' };
#else
std::vector<char> vec( 6, 'w' );
#endif
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
cstring_span sv( vec );
EXPECT( sv.length() == index_type( 6 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"(un)constrained construction from container is not available" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a non-const container, via a tag (std::vector)" )
{
#if gsl_FEATURE_TO_STD( WITH_CONTAINER )
std::vector<char> vec = vector_iota<char>( 9 );
cstring_span sv( with_container, vec );
EXPECT( sv.length() == index_type( 9 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"with_container is not available (gsl_FEATURE_WITH_CONTAINER_TO_STD)" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a const C-string and size" )
{
const char s[] = "hello";
cstring_span sv( s, strlen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a cstring_span from a non-const C-string begin and end pointer" )
{
const char s[] = "hello";
cstring_span sv( s, s + strlen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a cstring_span from a const C-array" )
{
const char s[] = { 'w', 'o', 'r', 'l', 'd', '\0' };
cstring_span sv( s );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::string( sv.data() ) == "world" );
}
CASE( "string_span: Allows to construct a cstring_span from a const std::string" )
{
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
const std::string s = "hello, world";
cstring_span sv( s );
EXPECT( sv.length() == 12u );
EXPECT( std::string( sv.data() ) == s );
#else
EXPECT( !!"(un)constrained construction from container is not available" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a const std::array (C++11)" )
{
#if gsl_HAVE( ARRAY )
const std::array<char,6> arr = {{ 'w', 'o', 'r', 'l', 'd', '\0' }};
cstring_span sv( arr );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::equal( sv.begin(), sv.end(), arr.begin() ) );
#else
EXPECT( !!"std::array<> is not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a const container (std::vector)" )
{
#if gsl_HAVE( INITIALIZER_LIST )
const std::vector<char> vec = { 'w', 'o', 'r', 'l', 'd', '\0' };
#else
const std::vector<char> vec( 6, 'w' );
#endif
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
cstring_span sv( vec );
EXPECT( sv.length() == index_type( 6 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"(un)constrained construction from container is not available" );
#endif
}
CASE( "string_span: Allows to construct a cstring_span from a const container, via a tag (std::vector)" )
{
#if gsl_FEATURE_TO_STD( WITH_CONTAINER )
const std::vector<char> vec = vector_iota<char>( 9 );
cstring_span sv( with_container, vec );
EXPECT( sv.length() == index_type( 9 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"with_container is not available (gsl_FEATURE_WITH_CONTAINER_TO_STD)" );
#endif
}
#if gsl_HAVE( WCHAR )
CASE( "string_span: Allows to construct a wstring_span from a non-const C-string and size" )
{
wchar_t s[] = L"hello";
wstring_span sv( s, wcslen( s ) );
EXPECT( std::wstring( sv.data() ) == std::wstring( s ) );
}
CASE( "string_span: Allows to construct a wstring_span from a non-const C-string begin and end pointer" )
{
wchar_t s[] = L"hello";
wstring_span sv( s, s + wcslen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::wstring( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a wstring_span from a non-const C-array" )
{
wchar_t s[] = { L'w', L'o', L'r', L'l', L'd', L'\0' };
wstring_span sv( s );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::wstring( sv.data() ) == std::wstring( s ) );
}
CASE( "string_span: Allows to construct a wstring_span from a non-const std::wstring" )
{
std::wstring s = L"hello, world";
wstring_span sv( s );
EXPECT( sv.length() == 12u );
EXPECT( std::wstring( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a wstring_span from a non-const std::array (C++11)" )
{
#if gsl_HAVE( ARRAY )
std::array<wchar_t,6> arr = {{ 'w', 'o', 'r', 'l', 'd', '\0' }};
wstring_span sv( arr );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::equal( sv.begin(), sv.end(), arr.begin() ) );
#else
EXPECT( !!"std::array<> is not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to construct a wstring_span from a non-const container (std::vector)" )
{
#if gsl_HAVE( INITIALIZER_LIST )
std::vector<wchar_t> vec = { L'w', L'o', L'r', L'l', L'd', L'\0' };
#else
std::vector<wchar_t> vec( 6, 'w' );
#endif
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
wstring_span sv( vec );
EXPECT( sv.length() == index_type( 6 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"(un)constrained construction from container is not available" );
#endif
}
CASE( "string_span: Allows to construct a wstring_span from a non-const container, via a tag (std::vector)" )
{
#if gsl_FEATURE_TO_STD( WITH_CONTAINER )
std::vector<wchar_t> vec = vector_iota<wchar_t>( 9 );
wstring_span sv( with_container, vec );
EXPECT( sv.length() == index_type( 9 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"with_container is not available (gsl_FEATURE_WITH_CONTAINER_TO_STD)" );
#endif
}
CASE( "string_span: Allows to construct a cwstring_span from a non-const C-string and size" )
{
wchar_t s[] = L"hello";
cwstring_span sv( s, wcslen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::wstring( sv.data() ) == std::wstring( s ) );
}
CASE( "string_span: Allows to construct a cwstring_span from a non-const C-string begin and end pointer" )
{
wchar_t s[] = L"hello";
cwstring_span sv( s, s + wcslen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::wstring( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a cwstring_span from a non-const C-array" )
{
wchar_t s[] = { L'w', L'o', L'r', L'l', L'd', L'\0' };
cwstring_span sv( s );
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_COMPILER_MSVC_VERSION
EXPECT( sv.length() == index_type( 5 ) );
#elif gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
EXPECT( !!"Warning: Unconstrained span container constructor enabled: terminating '\0' included in span" );
EXPECT( sv.length() == index_type( 6 ) );
#else
EXPECT( sv.length() == index_type( 5 ) );
#endif
EXPECT( std::wstring( sv.data() ) == std::wstring( s ) );
}
CASE( "string_span: Allows to construct a cwstring_span from a non-const std::wstring" )
{
std::wstring s = L"hello, world";
cwstring_span sv( s );
EXPECT( sv.length() == 12u );
EXPECT( std::wstring( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a cwstring_span from a non-const std::array (C++11)" )
{
#if gsl_HAVE( ARRAY )
std::array<wchar_t,6> arr = {{ 'w', 'o', 'r', 'l', 'd', '\0' }};
cwstring_span sv( arr );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::equal( sv.begin(), sv.end(), arr.begin() ) );
#else
EXPECT( !!"std::array<> is not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to construct a cwstring_span from a non-const container (std::vector)" )
{
#if gsl_HAVE( INITIALIZER_LIST )
std::vector<wchar_t> vec = { L'w', L'o', L'r', L'l', L'd', L'\0' };
#else
std::vector<wchar_t> vec( 6, 'w' );
#endif
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
cwstring_span sv( vec );
EXPECT( sv.length() == index_type( 6 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"(un)constrained construction from container is not available" );
#endif
}
CASE( "string_span: Allows to construct a cwstring_span from a non-const container, via a tag (std::vector)" )
{
#if gsl_FEATURE_TO_STD( WITH_CONTAINER )
std::vector<wchar_t> vec = vector_iota<wchar_t>( 9 );
cwstring_span sv( with_container, vec );
EXPECT( sv.length() == index_type( 9 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"with_container is not available (gsl_FEATURE_WITH_CONTAINER_TO_STD)" );
#endif
}
CASE( "string_span: Allows to construct a cwstring_span from a const C-string and size" )
{
const wchar_t s[] = L"hello";
cwstring_span sv( s, wcslen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::wstring( sv.data() ) == std::wstring( s ) );
}
CASE( "string_span: Allows to construct a cwstring_span from a const C-string begin and end pointer" )
{
const wchar_t s[] = L"hello";
cwstring_span sv( s, s + wcslen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::wstring( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a cwstring_span from a const C-array" )
{
const wchar_t s[] = { L'w', L'o', L'r', L'l', L'd', L'\0' };
cwstring_span sv( s );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::wstring( sv.data() ) == std::wstring( s ) );
}
CASE( "string_span: Allows to construct a cwstring_span from a const std::wstring" )
{
const std::wstring s = L"hello, world";
cwstring_span sv( s );
EXPECT( sv.length() == 12u );
EXPECT( std::wstring( sv.data() ) == s );
}
CASE( "string_span: Allows to construct a cwstring_span from a const std::array (C++11)" )
{
#if gsl_HAVE( ARRAY )
const std::array<wchar_t,6> arr = {{ 'w', 'o', 'r', 'l', 'd', '\0' }};
cwstring_span sv( arr );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( std::equal( sv.begin(), sv.end(), arr.begin() ) );
#else
EXPECT( !!"std::array<> is not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to construct a cwstring_span from a const container (std::vector)" )
{
#if gsl_HAVE( INITIALIZER_LIST )
const std::vector<wchar_t> vec = { L'w', L'o', L'r', L'l', L'd', L'\0' };
#else
const std::vector<wchar_t> vec( 6, 'w' );
#endif
#if gsl_HAVE( CONSTRAINED_SPAN_CONTAINER_CTOR ) || gsl_HAVE( UNCONSTRAINED_SPAN_CONTAINER_CTOR )
cwstring_span sv( vec );
EXPECT( sv.length() == index_type( 6 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"(un)constrained construction from container is not available" );
#endif
}
CASE( "string_span: Allows to construct a cwstring_span from a const container, via a tag (std::vector)" )
{
#if gsl_FEATURE_TO_STD( WITH_CONTAINER )
const std::vector<wchar_t> vec = vector_iota<wchar_t>( 9 );
cwstring_span sv( with_container, vec );
EXPECT( sv.length() == index_type( 9 ) );
EXPECT( std::equal( sv.begin(), sv.end(), vec.begin() ) );
#else
EXPECT( !!"with_container is not available (gsl_FEATURE_WITH_CONTAINER_TO_STD)" );
#endif
}
#endif // gsl_HAVE( WCHAR )
CASE( "string_span: Allows to copy-construct from another span of the same type" )
{
cstring_span a = "hello";
cstring_span b( a );
EXPECT( a.length() == b.length() );
EXPECT( std::equal( a.begin(), a.end(), b.begin() ) );
}
CASE( "string_span: Allows to copy-construct from another span of a compatible type" )
{
char hello[] = "hello";
string_span a = hello;
cstring_span b( a );
EXPECT( a.length() == b.length() );
EXPECT( std::equal( a.begin(), a.end(), b.begin() ) );
}
CASE( "string_span: Allows to move-construct from another span of the same type (C++11)" )
{
#if gsl_STDLIB_CPP11_OR_GREATER
char hello[] = "hello";
string_span a(( string_span( hello ) ));
EXPECT( a.length() == index_type( strlen( hello ) ) );
EXPECT( std::equal( a.begin(), a.end(), hello ) );
#else
EXPECT( !!"move-semantics are not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to copy-assign from another span of the same type" )
{
char hello[] = "hello";
string_span a = hello;
string_span b;
b = a;
EXPECT( a.length() == b.length() );
EXPECT( std::equal( a.begin(), a.end(), b.begin() ) );
}
CASE( "string_span: Allows to move-assign from another span of the same type (C++11)" )
{
#if gsl_STDLIB_CPP11_OR_GREATER
char hello[] = "hello";
string_span a;
a = string_span( hello );
EXPECT( a.length() == index_type( strlen( hello ) ) );
EXPECT( std::equal( a.begin(), a.end(), hello ) );
#else
EXPECT( !!"move-semantics are not available (no C++11)" );
#endif
}
CASE( "string_span: Allows to create a sub span of the first n elements" )
{
char hello[] = "hello";
string_span a( hello );
index_type count = 2;
string_span s = a.first( count );
EXPECT( s.size() == count );
EXPECT( std::equal( s.begin(), s.end(), hello ) );
}
CASE( "string_span: Allows to create a sub span of the last n elements" )
{
char hello[] = "hello";
string_span a( hello );
index_type count = 2;
string_span s = a.last( count );
EXPECT( s.size() == count );
EXPECT( std::equal( s.begin(), s.end(), hello + strlen(hello) - count ) );
}
CASE( "string_span: Allows to create a sub span starting at a given offset" )
{
char hello[] = "hello";
string_span a( hello );
index_type offset = 1;
string_span s = a.subspan( offset );
EXPECT( s.size() == index_type( strlen(hello) - offset ) );
EXPECT( std::equal( s.begin(), s.end(), hello + offset ) );
}
CASE( "string_span: Allows to create a sub span starting at a given offset with a given length" )
{
char hello[] = "hello";
string_span a( hello );
index_type offset = 1;
index_type length = 1;
string_span s = a.subspan( offset, length );
EXPECT( s.size() == length );
EXPECT( std::equal( s.begin(), s.end(), hello + offset ) );
}
CASE( "string_span: Allows to create an empty sub span at full offset" )
{
char hello[] = "hello";
string_span a( hello );
index_type offset = strlen( hello );
string_span s = a.subspan( offset );
EXPECT( s.empty() );
}
CASE( "string_span: Allows to create an empty sub span at full offset with zero length" )
{
char hello[] = "hello";
string_span a( hello );
index_type offset = strlen( hello );
index_type length = 0;
string_span s = a.subspan( offset, length );
EXPECT( s.empty() );
}
CASE( "string_span: Allows forward iteration" )
{
char hello[] = "hello";
string_span a( hello );
for ( string_span::iterator pos = a.begin(); pos != a.end(); ++pos )
{
index_type i = narrow_failfast<index_type>( std::distance( a.begin(), pos ) );
EXPECT( *pos == a[i] );
}
}
CASE( "string_span: Allows const forward iteration" )
{
char hello[] = "hello";
string_span a( hello );
for ( string_span::const_iterator pos = a.begin(); pos != a.end(); ++pos )
{
index_type i = narrow_failfast<index_type>( std::distance( a.cbegin(), pos ) );
EXPECT( *pos == a[i] );
}
}
CASE( "string_span: Allows reverse iteration" )
{
char hello[] = "hello";
string_span a( hello );
for ( string_span::reverse_iterator pos = a.rbegin(); pos != a.rend(); ++pos )
{
index_type dist = narrow_failfast<index_type>( std::distance( a.rbegin(), pos ) );
EXPECT( *pos == a[ a.size() - 1 - dist ] );
}
}
CASE( "string_span: Allows const reverse iteration" )
{
char hello[] = "hello";
string_span a( hello );
for ( string_span::const_reverse_iterator pos = a.crbegin(); pos != a.crend(); ++pos )
{
index_type dist = narrow_failfast<index_type>( std::distance( a.crbegin(), pos ) );
EXPECT( *pos == a[ a.size() - 1 - dist ] );
}
}
CASE( "string_span: Allows to observe an element via array indexing" )
{
char hello[] = "hello";
string_span a( hello );
for ( index_type i = 0; i < a.size(); ++i )
{
EXPECT( a[i] == hello[i] );
EXPECT( &a[i] == &hello[i] );
}
}
#if ! gsl_DEPRECATE_TO_LEVEL( 6 )
CASE( "string_span: Allows to observe an element via call indexing" )
{
char hello[] = "hello";
string_span a( hello );
for ( index_type i = 0; i < a.size(); ++i )
{
EXPECT( a(i) == hello[i] );
EXPECT( &a(i) == &hello[i] );
}
}
#endif // deprecate
CASE( "string_span: Allows to observe an element via front() and back()" )
{
char hello[] = "hello";
string_span a( hello );
EXPECT( a.front() == hello[0] );
EXPECT( &a.front() == &hello[0] );
EXPECT( a.back() == hello[4] );
EXPECT( &a.back() == &hello[4] );
}
CASE( "string_span: Allows to observe an element via data()" )
{
char hello[] = "hello";
string_span a( hello );
EXPECT( *a.data() == *a.begin() );
EXPECT( a.data() == &*a.begin() );
for ( index_type i = 0; i < a.size(); ++i )
{
EXPECT( a.data()[i] == hello[i] );
EXPECT( a.data()[i] == hello[i] );
}
}
CASE( "string_span: Allows to change an element via array indexing" )
{
char hello[] = "hello";
string_span a( hello );
a[1] = '7';
EXPECT( hello[1] == '7' );
}
#if ! gsl_DEPRECATE_TO_LEVEL( 6 )
CASE( "string_span: Allows to change an element via call indexing" )
{
char hello[] = "hello";
string_span a( hello );
a(1) = '7';
EXPECT( hello[1] == '7' );
}
#endif // deprecate
CASE( "string_span: Allows to change an element via front() and back()" )
{
char hello[] = "hello";
string_span a( hello );
a.front() = '1';
a.back() = '2';
EXPECT( hello[0] == '1' );
EXPECT( hello[4] == '2' );
}
#if 0
CASE( "string_span: Allows to change an element via at()" )
{
char hello[] = "hello";
string_span a( hello );
a.at(1) = '7';
EXPECT( hello[1] == '7' );
}
#endif
CASE( "string_span: Allows to change an element via data()" )
{
char hello[] = "hello";
string_span a( hello );
*a.data() = '7';
EXPECT( hello[0] == '7' );
}
CASE( "string_span: Allows to compare a string_span with another string_span" )
{
char s[] = "hello";
char t[] = "world";
string_span sv( s, strlen( s ) );
string_span tv( t, strlen( s ) );
EXPECT( sv.length() == index_type( 5 ) );
EXPECT( tv.length() == index_type( 5 ) );
EXPECT( sv == sv );
EXPECT( sv != tv );
EXPECT( sv <= sv );
EXPECT( sv <= tv );
EXPECT( sv < tv );
EXPECT( tv >= tv );
EXPECT( tv >= sv );
EXPECT( tv > sv );
}
CASE( "string_span: Allows to compare empty spans as equal (questionable)" "[.]" )
{
string_span a, b;
EXPECT( a == b );
}
CASE( "string_span: Allows to compare empty span to non-empty span" )
{
char s[] = "hello";
string_span a, b( s, strlen( s ) );
EXPECT( a != b );
EXPECT( b != a );
}
CASE( "string_span: Allows to compare a string_span with a cstring_span" )
{
#if gsl_CONFIG( ALLOWS_NONSTRICT_SPAN_COMPARISON )
char s[] = "hello";
string_span sv( s, strlen( s ) );
cstring_span csv( s, strlen( s ) );
EXPECT( sv == csv );
#else
EXPECT( !!"string_span: cannot compare different types (gsl_CONFIG_ALLOWS_NONSTRICT_SPAN_COMPARISON=0)" );
#endif
}
CASE( "string_span: Allows to compare with types convertible to string_span" )
{
#if gsl_CONFIG( ALLOWS_NONSTRICT_SPAN_COMPARISON )
char const * phello = "hello";
char const ahello[] = "hello";
std::string shello = "hello";
cstring_span a = phello;
EXPECT( a == phello );
EXPECT( a == ahello );
EXPECT( a == shello );
EXPECT( a <= phello );
EXPECT( a <= ahello );
EXPECT( a <= shello );
EXPECT( a >= phello );
EXPECT( a >= ahello );
EXPECT( a >= shello );
EXPECT_NOT( a != phello );
EXPECT_NOT( a != ahello );
EXPECT_NOT( a != shello );
EXPECT_NOT( a < phello );
EXPECT_NOT( a < ahello );
EXPECT_NOT( a < shello );
EXPECT_NOT( a > phello );
EXPECT_NOT( a > ahello );
EXPECT_NOT( a > shello );
#if gsl_HAVE( OWNER_TEMPLATE )
EXPECT( phello == a );
EXPECT( ahello == a );