class ExtendedParsedFormat

A value type representing a preparsed format. These can be created, copied

around, and reused to speed up formatting loops.

The user must specify through the template arguments the conversion

characters used in the format. This will be checked at compile time.

This class uses Conv enum values to specify each argument.

This allows for more flexibility as you can specify multiple possible

conversion characters for each argument.

ParsedFormat

<char

...> is a simplified alias for when the user only

needs to specify a single conversion character for each argument.

Example:

// Extended format supports multiple characters per argument:

using MyFormat = ExtendedParsedFormat

<Conv

::d | Conv::x>;

MyFormat GetFormat(bool use_hex) {

if (use_hex) return MyFormat("foo %x bar");

return MyFormat("foo %d bar");

}

// 'format' can be used with any value that supports 'd' and 'x',

// like `int`.

auto format = GetFormat(use_hex);

value = StringF(format, i);

This class also supports runtime format checking with the ::New() and

::NewAllowIgnored() factory functions.

This is the only API that allows the user to pass a runtime specified format

string. These factory functions will return NULL if the format does not match

the conversions requested by the user.