rexy712/rexylib
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Fix strcmp not using 'if constexpr' and add strncmp

Browse Source
This commit is contained in:
rexy712 2022-06-19 11:27:26 -07:00
parent da5eb13d94
commit 588835d80a
1 changed files with 31 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
include/rexy/utility.hpp
View File

@ -99,15 +99,39 @@ namespace rexy{
template<class T> template<class T>
constexpr int strcmp(const T* l, const T* r)noexcept{ constexpr int strcmp(const T* l, const T* r)noexcept{
if(!std::is_constant_evaluated()){ if(!std::is_constant_evaluated()){
if(std::is_same_v<std::remove_cvref_t<T>,char>){ if constexpr(std::is_same_v<std::remove_cvref_t<T>,char>){
return std::strcmp(l, r); return std::strcmp(l, r);
}else if(std::is_same_v<std::remove_cvref_t<T>,wchar_t>){ }else if constexpr(std::is_same_v<std::remove_cvref_t<T>,wchar_t>){
return std::wcscmp(l, r); return std::wcscmp(l, r);
} }
} }
for(;*l == *r && *l;++l, ++r); for(;*l == *r && *l;++l, ++r);
return *l - *r; return *l - *r;
} }
template<class T>
constexpr int strncmp(const T* l, const T* r, std::size_t max)noexcept{
if(!std::is_constant_evaluated()){
if constexpr(std::is_same_v<std::remove_cvref_t<T>,char>){
return std::strncmp(l, r, max);
}else if constexpr (std::is_same_v<std::remove_cvref_t<T>,wchar_t>){
return std::wcsncmp(l, r, max);
}
}
for(std::size_t i = 1;*l == *r && *l && i < max;++i, ++l, ++r);
return *l - *r;
}
template<class T, class Compare>
constexpr int strncmp(const T* l, const T* r, std::size_t max, Compare cmp)noexcept{
if(!std::is_constant_evaluated()){
if constexpr(std::is_same_v<std::remove_cvref_t<T>,char>){
return std::strncmp(l, r, max);
}else if constexpr (std::is_same_v<std::remove_cvref_t<T>,wchar_t>){
return std::wcsncmp(l, r, max);
}
}
for(std::size_t i = 1;cmp(l, r) && *l && i < max;++i, ++l, ++r);
return *l - *r;
}
template<class T, class Compare> template<class T, class Compare>
constexpr int strcmp(const T* l, const T* r, Compare cmp)noexcept{ constexpr int strcmp(const T* l, const T* r, Compare cmp)noexcept{
for(;cmp(*l, *r) && *l;++l, ++r); for(;cmp(*l, *r) && *l;++l, ++r);
@ -142,6 +166,11 @@ namespace rexy{
for(;cmp(*l, *r) && *l;++l, ++r); for(;cmp(*l, *r) && *l;++l, ++r);
return *l - *r; return *l - *r;
} }
template<class T>
constexpr int strncmp(const T* l, const T* r, std::size_t max)noexcept{
for(std::size_t i = 0;*l == *r && *l && i < max;++i, ++l, ++r);
return *l - *r;
}
constexpr void memcpy(void* l, const void* r, size_t n){ constexpr void memcpy(void* l, const void* r, size_t n){
char* ld = static_cast<char*>(l); char* ld = static_cast<char*>(l);
const char* rd = static_cast<const char*>(r); const char* rd = static_cast<const char*>(r);