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use lamda function to do complex initialization with a (wanted) side-effect

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Dennis Luxen 2015-03-30 13:01:16 +02:00
parent 6933804aa4
commit d6badca610
1 changed files with 16 additions and 8 deletions
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24
util/string_util.hpp
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@ -41,12 +41,18 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// work with negative values to prevent overflowing when taking -value // work with negative values to prevent overflowing when taking -value
template <int length, int precision> static inline char *printInt(char *buffer, int value) template <int length, int precision> static inline char *printInt(char *buffer, int value)
{ {
bool minus = true; static_assert(length > 0, "length must be positive");
if (value >= 0) static_assert(precision > 0, "precision must be positive");
{
minus = false; const bool minus = [&value]{
value = -value; if (value >= 0)
} {
value = -value;
return false;
}
return true;
}();
buffer += length - 1; buffer += length - 1;
for (int i = 0; i < precision; ++i) for (int i = 0; i < precision; ++i)
{ {
@ -56,6 +62,7 @@ template <int length, int precision> static inline char *printInt(char *buffer,
} }
*buffer = '.'; *buffer = '.';
--buffer; --buffer;
for (int i = precision + 1; i < length; ++i) for (int i = precision + 1; i < length; ++i)
{ {
*buffer = '0' - (value % 10); *buffer = '0' - (value % 10);
@ -66,6 +73,7 @@ template <int length, int precision> static inline char *printInt(char *buffer,
} }
--buffer; --buffer;
} }
if (minus) if (minus)
{ {
--buffer; --buffer;
@ -128,10 +136,10 @@ inline std::string escape_JSON(const std::string &input)
inline std::size_t URIDecode(const std::string &input, std::string &output) inline std::size_t URIDecode(const std::string &input, std::string &output)
{ {
auto src_iter = input.begin(); auto src_iter = std::begin(input);
output.resize(input.size() + 1); output.resize(input.size() + 1);
std::size_t decoded_length = 0; std::size_t decoded_length = 0;
for (decoded_length = 0; src_iter != input.end(); ++decoded_length) for (decoded_length = 0; src_iter != std::end(input); ++decoded_length)
{ {
if (src_iter[0] == '%' && src_iter[1] && src_iter[2] && isxdigit(src_iter[1]) && if (src_iter[0] == '%' && src_iter[1] && src_iter[2] && isxdigit(src_iter[1]) &&
isxdigit(src_iter[2])) isxdigit(src_iter[2]))