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simstr
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Change toDouble

This commit is contained in:
Aleksandr Orefkov 2025-11-24 16:18:02 +03:00
parent fa55aa5f46
commit 458007e1dc
1 changed files with 59 additions and 27 deletions
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86
include/simstr/sstring.h
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@ -75,6 +75,7 @@ const bool isx64 = sizeof(void*) == 8; // NOLINT
#include <memory>
#include <string.h>
#include <iostream>
#include <cmath>
#ifdef _WIN32
#include <stdio.h>
@ -1460,43 +1461,74 @@ public:
* @return double. So far it only works for strings of char, wchar_t and types compatible with wchar_t in size.
*/
double to_double() const noexcept {
static_assert(sizeof(K) == 1 || sizeof(K) == sizeof(wchar_t), "Only char and wchar available for conversion to double now");
size_t len = _len();
if (len) {
const size_t copyLen = 64;
K buf[copyLen + 1];
const K* ptr = _str();
if (ptr[len] != 0) {
if constexpr (is_one_of_std_char_v<K>) {
size_t len = _len();
if (len) {
const size_t copyLen = 64;
K buf[copyLen + 1];
const K* ptr = _str();
if (ptr[len] != 0) {
while (len && uns_type(*ptr) <= ' ') {
len--;
ptr++;
}
if (len) {
len = std::min(copyLen, len);
traits::copy(buf, ptr, len);
buf[len] = 0;
ptr = buf;
}
}
if (len) {
#ifdef _MSC_VER
static const _locale_t lc = _wcreate_locale(LC_NUMERIC, L"C");
if constexpr (sizeof(K) == 1) {
return _strtod_l(ptr, nullptr, lc);
}
if constexpr (sizeof(K) == sizeof(wchar_t)) {
return _wcstod_l((const wchar_t*)ptr, nullptr, lc);
}
#else
if constexpr (sizeof(K) == 1) {
return std::strtod(ptr, nullptr);
} else if constexpr (sizeof(K) == sizeof(wchar_t)) {
return std::wcstod((const wchar_t*)ptr, nullptr);
}
#endif
}
}
return std::nan("0");
} else {
size_t len = _len();
if (len) {
const size_t copyLen = 64;
char buf[copyLen + 1];
const K* ptr = _str();
while (len && uns_type(*ptr) <= ' ') {
len--;
ptr++;
}
if (len) {
len = std::min(copyLen, len);
traits::copy(buf, ptr, len);
for (unsigned idx = 0; idx < len; idx++) {
if (ptr[idx] > 128) {
return std::nan("0");
}
buf[idx] = ptr[idx];
}
buf[len] = 0;
ptr = buf;
}
if (len) {
#ifdef _MSC_VER
static const _locale_t lc = _wcreate_locale(LC_NUMERIC, L"C");
return _strtod_l(buf, nullptr, lc);
#else
return std::strtod(buf, nullptr);
#endif
}
}
if (len) {
#ifdef _MSC_VER
static const _locale_t lc = _wcreate_locale(LC_NUMERIC, L"C");
if constexpr (sizeof(K) == 1) {
return _strtod_l(ptr, nullptr, lc);
}
if constexpr (sizeof(K) == sizeof(wchar_t)) {
return _wcstod_l((const wchar_t*)ptr, nullptr, lc);
}
#else
if constexpr (sizeof(K) == 1) {
return std::strtod(ptr, nullptr);
} else if constexpr (sizeof(K) == sizeof(wchar_t)) {
return std::wcstod((const wchar_t*)ptr, nullptr);
}
#endif
}
return std::nan("0");
}
return 0.0;
}
/*!