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ToString for core number types

master
Daniel Kolesa 2015-05-28 01:26:48 +01:00
parent 1b75a10ec8
commit 324bdd154c
1 changed files with 44 additions and 8 deletions
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52
octa/string.h
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@ -68,6 +68,10 @@ namespace octa {
return *this;
}
void reserve(size_t n) {
p_buf.reserve(n + 1);
}
T &operator[](size_t i) { return p_buf[i]; }
const T &operator[](size_t i) const { return p_buf[i]; }
@ -162,6 +166,20 @@ namespace octa {
String operator()(const T &) { return ""; }
};
template<typename S, typename T, typename U>
void __octa_str_printf(S *s, const T *fmt, U v) {
char buf[256];
auto p_buf = (Vector<typename S::ValType> *)s;
size_t n = snprintf(buf, sizeof(buf), fmt, v);
p_buf->clear();
p_buf->reserve(n + 1);
if (n >= sizeof(buf))
snprintf(p_buf->data(), n + 1, fmt, v);
else
memcpy(p_buf->data(), buf, n + 1);
*(((size_t *)p_buf) + 1) = n + 1;
}
template<> struct ToString<char> {
typedef char ArgType;
typedef String ResultType;
@ -172,15 +190,33 @@ namespace octa {
}
};
template<> struct ToString<int> {
typedef int ArgType;
typedef String ResultType;
String operator()(int v) {
char buf[128];
sprintf(buf, "%d", v);
return String((const char *)buf);
}
#define __OCTA_TOSTR_NUM(T, fmt) \
template<> struct ToString<T> { \
typedef T ArgType; \
typedef String ResultType; \
String operator()(T v) { \
String ret; \
__octa_str_printf(&ret, fmt, v); \
return move(ret); \
} \
};
__OCTA_TOSTR_NUM(int, "%d")
__OCTA_TOSTR_NUM(uint, "%u")
__OCTA_TOSTR_NUM(long, "%ld")
__OCTA_TOSTR_NUM(ulong, "%lu")
__OCTA_TOSTR_NUM(llong, "%lld")
__OCTA_TOSTR_NUM(ullong, "%llu")
__OCTA_TOSTR_NUM(float, "%f")
__OCTA_TOSTR_NUM(double, "%f")
__OCTA_TOSTR_NUM(ldouble, "%Lf")
#undef __OCTA_TOSTR_NUM
template<typename T>
String to_string(const T &v) {
return move(ToString<T>()(v));
}
}
#endif