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SwitchString.cpp
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/**
* \file SwitchString.cpp
* \brief Compile-time switch for C-string
*
* \see Samples
* - https://github.com/rioki/rex/blob/master/strex.h#L71
* - https://learnmoderncpp.com/2020/06/01/strings-as-switch-case-labels/
*/
#include <StdStream/StdStream.h>
#include <StdTest/StdTest.h>
#include <Stl.h>
//--------------------------------------------------------------------------------------------------
constexpr std::size_t
hash(
const char *a_str,
const std::size_t a_h = {}
)
{
if (a_str == nullptr) {
return {};
}
return !a_str[a_h] ? 5381 : (hash(a_str, a_h + 1) * 33) ^ a_str[a_h];
}
//-------------------------------------------------------------------------------------------------
std::size_t
hash(
const std::string &a_str
)
{
return ::hash( a_str.c_str() );
}
//-------------------------------------------------------------------------------------------------
void
ifString_test(
const std::string &a_value
)
{
if (a_value == "aaaaa") {
std::cout << "aaaaa" << std::endl;
}
else if (a_value == "bbbbb") {
std::cout << "bbbbb" << std::endl;
}
else if (a_value == "ccccc") {
std::cout << "ccccc" << std::endl;
}
else {
std::cout << "[Unknown]: " << ::hash(a_value) << std::endl;
}
}
//-------------------------------------------------------------------------------------------------
void
switchString_test(
const char *a_value
)
{
switch (::hash(a_value)) {
case ::hash("aaaaa"):
std::cout << "aaaaa" << std::endl;
break;
case ::hash("bbbbb"):
std::cout << "bbbbb" << std::endl;
break;
case ::hash("ccccc"):
std::cout << "ccccc" << std::endl;
break;
default:
std::cout << "[Unknown]: " << ::hash(a_value) << std::endl;
break;
}
}
//-------------------------------------------------------------------------------------------------
int main(int, char **)
{
{
#if 1
std::cout << "::: ifString_test :::" << std::endl;
::ifString_test("aaaaa");
::ifString_test("bbbbb");
::ifString_test("ccccc");
::ifString_test("xxxxx");
::ifString_test("");
::ifString_test({}); // nullptr
#endif
}
std::cout << std::endl;
{
#if 1
std::cout << "::: switchString_test :::" << std::endl;
::switchString_test("aaaaa");
::switchString_test("bbbbb");
::switchString_test("ccccc");
::switchString_test("xxxxx");
::switchString_test("");
::switchString_test(nullptr);
#endif
}
return EXIT_SUCCESS;
}
//-------------------------------------------------------------------------------------------------
#if OUTPUT
#endif