AZStd::basic_string improvements (#6438)
* AZStd::basic_string improvements The AZStd::basic_string class has a better implementation of the Short String Optimization, which increases the amount of characters that can be stored in a `basic_string<char>` from 15 characters to 22 characters(not-including null-terminating characters). For a `basic_string<wchar_t>` on Windows the amount of characters that can be stored increases from 7 to 10. Using `basic_string<wchar_t>` on Unix platforms SSO character amount from 3 to 4 characters. An additional benefit is that the size of the AZStd::basic_string class has been reduced from 40 bytes to 32 bytes when using the AZStd::allocator. When using a stateless allocator with no non static data members such as AZStd::stateless_allocator, the size of the AZStd::basic_string is 24 bytes. Signed-off-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com> * Corrected comments and updated type alias to usings for AZStd::basic_string Signed-off-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com> * Added Benchmarks for the basic_string and basic_fixed_string class The benchmarks currently measure the speed of the `assign` overloads. A benchmark has also been added to compare the speed swapping two `basic_string` instances by 3 memcpy vs 3 pointer swap operations Speed up string operation when in the iterator overload cases of the `assign`, `append`, `insert` and `replace` function. The code was always performing the logic to copy over a string that is overlapping, without actually checking if the string was overlapping in the first place. Added an `az_builtin_is_constant_evaluated` macro that allows use of the C++20 `std::is_constant_evaluated` feature to determine if an operation is being performed at compile time vs run time. That macro is being used to speed up the char_trait operations at run time, by using the faster standard library functions. For example char_traits::move now uses "memmove" at runtime, instead of a for loop. Signed-off-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com> * Simplified string logic in AWSMetricsServiceApiTest. Signed-off-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com>
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@@ -10,6 +10,13 @@
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</Expand>
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</Type>
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<Type Name="AZStd::compressed_pair_element<*,*,*>">
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<DisplayString>{m_element}</DisplayString>
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</Type>
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<Type Name="AZStd::compressed_pair_element<*,*,1>">
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<DisplayString>{$T1} is empty</DisplayString>
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</Type>
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<Type Name="AZStd::reverse_iterator<*>" Priority="Medium">
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<DisplayString>reverse_iterator base() {m_current}</DisplayString>
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<Expand>
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@@ -388,35 +395,41 @@
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<!-- -->
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<Type Name="AZStd::basic_string<char,*>">
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<DisplayString Condition="m_capacity < SSO_BUF_SIZE">{m_buffer,s}</DisplayString>
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<DisplayString Condition="m_capacity >= SSO_BUF_SIZE">{m_data,s}</DisplayString>
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<StringView Condition="m_capacity < SSO_BUF_SIZE">m_buffer,s</StringView>
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<StringView Condition="m_capacity >= SSO_BUF_SIZE">m_data,s</StringView>
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<Type Name="AZStd::basic_string<char,*,*>">
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<DisplayString Condition="((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">{((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_buffer,s}</DisplayString>
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<DisplayString Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">{((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_data,s}</DisplayString>
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<StringView Condition="((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_buffer,s</StringView>
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<StringView Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_data,s</StringView>
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<Expand>
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<Item Name="[size]">m_size</Item>
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<Item Name="[capacity]">m_capacity</Item>
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<Item Name="[size]" Condition="((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">(size_t)((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_size</Item>
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<Item Name="[size]" Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_size</Item>
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<Item Name="[capacity]" Condition="((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.Capacity</Item>
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<Item Name="[capacity]" Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_capacity</Item>
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<ArrayItems>
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<Size>m_size</Size>
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<ValuePointer Condition="m_capacity < SSO_BUF_SIZE">m_buffer</ValuePointer>
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<ValuePointer Condition="m_capacity >= SSO_BUF_SIZE">m_data</ValuePointer>
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<Size Condition="((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_size,u</Size>
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<Size Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_size</Size>
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<ValuePointer Condition="((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_buffer</ValuePointer>
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<ValuePointer Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<char,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_data</ValuePointer>
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</ArrayItems>
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</Expand>
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</Type>
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<Type Name="AZStd::basic_string<wchar_t,*>">
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<AlternativeType Name="AZStd::basic_string<unsigned short,*>" />
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<DisplayString Condition="m_capacity < SSO_BUF_SIZE">{m_buffer,su}</DisplayString>
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<DisplayString Condition="m_capacity >= SSO_BUF_SIZE">{m_data,su}</DisplayString>
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<StringView Condition="m_capacity < SSO_BUF_SIZE">m_buffer,su</StringView>
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<StringView Condition="m_capacity >= SSO_BUF_SIZE">m_data,su</StringView>
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<DisplayString Condition="((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">{((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_buffer,su}</DisplayString>
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<DisplayString Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">{((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_data,su}</DisplayString>
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<StringView Condition="((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_buffer,su</StringView>
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<StringView Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_data,su</StringView>
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<Expand>
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<Item Name="[size]">m_size</Item>
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<Item Name="[capacity]">m_capacity</Item>
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<Item Name="[size]" Condition="((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">(size_t)((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_size</Item>
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<Item Name="[size]" Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_size</Item>
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<Item Name="[capacity]" Condition="((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.Capacity</Item>
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<Item Name="[capacity]" Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_capacity</Item>
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<ArrayItems>
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<Size>m_size</Size>
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<ValuePointer Condition="m_capacity < SSO_BUF_SIZE">m_buffer</ValuePointer>
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<ValuePointer Condition="m_capacity >= SSO_BUF_SIZE">m_data</ValuePointer>
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<Size Condition="((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_size,u</Size>
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<Size Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_size</Size>
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<ValuePointer Condition="((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_buffer</ValuePointer>
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<ValuePointer Condition="!((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_shortData.m_ssoActive">((AZStd::compressed_pair_element<AZStd::basic_string<wchar_t,$T1,$T2>::Storage,0,0>&)m_storage).m_element.m_allocatedData.m_data</ValuePointer>
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</ArrayItems>
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</Expand>
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</Type>
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