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#pragma once
/*
small string optimization (SSO) allocator
sizeof(string) == 8 + string::SSO
utilizes a union to store small strings directly into text pointer
bypasses the need to allocate heap memory for small strings
requires extra computations, which can be slower for large strings
pros:
* potential for in-place resize
* no heap allocation when (capacity < SSO)
cons:
* added overhead to fetch data()
* pass-by-value requires heap allocation when (capacity >= SSO)
*/
namespace nall {
inline string::string() {
_data = nullptr;
_capacity = SSO - 1;
_size = 0;
}
template<typename T>
inline auto string::get() -> T* {
if(_capacity < SSO) return (T*)_text;
return (T*)_data;
}
template<typename T>
inline auto string::data() const -> const T* {
if(_capacity < SSO) return (const T*)_text;
return (const T*)_data;
}
inline auto string::reset() -> type& {
if(_capacity >= SSO) memory::free(_data);
_data = nullptr;
_capacity = SSO - 1;
_size = 0;
return *this;
}
inline auto string::reserve(u32 capacity) -> type& {
if(capacity <= _capacity) return *this;
capacity = bit::round(capacity + 1) - 1;
if(_capacity < SSO) {
char _temp[SSO];
memory::copy(_temp, _text, SSO);
_data = memory::allocate<char>(_capacity = capacity + 1);
memory::copy(_data, _temp, SSO);
} else {
_data = memory::resize<char>(_data, _capacity = capacity + 1);
}
return *this;
}
inline auto string::resize(u32 size) -> type& {
reserve(size);
get()[_size = size] = 0;
return *this;
}
inline auto string::operator=(const string& source) -> type& {
if(&source == this) return *this;
reset();
if(source._capacity >= SSO) {
_data = memory::allocate<char>(source._capacity + 1);
_capacity = source._capacity;
_size = source._size;
memory::copy(_data, source._data, source._size + 1);
} else {
memory::copy(_text, source._text, SSO);
_capacity = SSO - 1;
_size = source._size;
}
return *this;
}
inline auto string::operator=(string&& source) -> type& {
if(&source == this) return *this;
reset();
memory::copy(this, &source, sizeof(string));
source._data = nullptr;
source._capacity = SSO - 1;
source._size = 0;
return *this;
}
}
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