clyne/ini-config
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Add get<T>() for converting values to numbers

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Clyne 2021-02-05 11:20:43 -05:00 committed by GitHub
parent 8fc7548c03
commit 3cee35d553
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1 changed files with 50 additions and 2 deletions
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52
ini_config.hpp
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@ -14,6 +14,8 @@
#include <iterator> // std::forward_iterator
#endif
#include <concepts> // std::integral, std::floating_point
namespace ini_config {
/**
@ -73,6 +75,34 @@ class ini_config
return in + 1;
}
template<std::integral int_type>
constexpr static int_type from_string(const char_type *str) noexcept {
int_type ret = 0;
bool neg = *str == '-';
if (neg)
++str;
for (; *str && *str >= '0' && *str <= '9'; ++str)
ret = ret * 10 + (*str - '0');
return !neg ? ret : -ret;
}
template<std::floating_point float_type>
constexpr static float_type from_string(const char_type *str) noexcept {
float_type ret = 0;
bool neg = *str == '-';
if (neg)
++str;
for (; *str && *str >= '0' && *str <= '9'; ++str)
ret = ret * 10 + (*str - '0');
if (*str == '.') {
float_type dec = 0.1;
for (++str; *str && *str >= '0' && *str <= '9'; ++str) {
ret += (*str - '0') * dec;
dec /= 10;
}
}
return !neg ? ret : -ret;
}
// Validates INI syntax, returning the count of chars
// needed to store all section names, keys, and values
consteval static unsigned int verify_and_size() {
@ -348,7 +378,7 @@ public:
}
/**
* Finds and returns the pair with the given key.
* Finds and returns the value paired with the given key.
* Returns an empty string on failure.
*/
constexpr auto get(const char_type *key) const noexcept {
@ -359,7 +389,16 @@ public:
return "";
}
/**
* Finds and returns the pair with the given key, in the given section.
* Finds and returns the value paired with the given key,
* converting it to the specified integral or floating-point type.
* Returns zero on failure.
*/
template<typename T> requires(std::integral<T> || std::floating_point<T>)
constexpr T get(const char_type *key) const noexcept {
return from_string<T>(get(key));
}
/**
* Finds and returns the value paired with the given key, in the given section.
* Returns an empty string on failure.
*/
constexpr auto get(const char_type *sec, const char_type *key) const noexcept {
@ -369,6 +408,15 @@ public:
}
return "";
}
/**
* Finds and returns the value paired with the given key in the given section,
* converting it to the specified integral or floating-point type.
* Returns zero on failure.
*/
template<typename T> requires(std::integral<T> || std::floating_point<T>)
constexpr T get(const char_type *sec, const char_type *key) const noexcept {
return from_string<T>(get(sec, key));
}
/**
* Array-style access to values. Searches all sections.
* Returns an empty string on failure.