It is possible to bind arguments to a variable storing their value, as an
alternative to explicitly calling ``program.get<T>(arg_name)`` or ``program[arg_name]``
This is currently implementeted for variables of type ``bool`` (this also
implicitly calls ``flag()``), ``int``, ``double``, ``std::string`` and
``std::vector<std::string>``. If the argument is not specified in the command
line, the default value (if set) is set into the variable.
```cpp
bool flagvar = false;
program.add_argument("--flagvar").store_into(flagvar);
int intvar = 0;
program.add_argument("--intvar").store_into(intvar);
double doublevar = 0;
program.add_argument("--doublevar").store_into(doublevar);
std::string strvar;
program.add_argument("--strvar").store_into(strvar);
std::vector<std::string> strvar_repeated;
program.add_argument("--strvar-repeated").append().store_into(strvar_repeated);
std::vector<std::string> strvar_multi_valued;
program.add_argument("--strvar-multi-valued").nargs(2).store_into(strvar_multi_valued);
```
The standard strtof/strtod/strtold are by default locale-aware. There
are a number of situations where we'd rather want to be able to use
locale-independent parsing functions. This can be done by setting the
ARGPARSE_CUSTOM_STRTOF/ARGPARSE_CUSTOM_STRTOD/ARGPARSE_CUSTOM_STRTOLD
macros to the appropriate value.
Allows users to opt-out of std::exit call in default arguments without
needing to replace with new --help and --version arguments.
Signed-off-by: Sean Robinson <sean.robinson@scottsdalecc.edu>
This attempts to fix Issue #225-1 by reverting the change that turned a
std::bad_any_cast exception into a nullptr.
Reverts commit 357068156e.
Signed-off-by: Sean Robinson <sean.robinson@scottsdalecc.edu>
The intent of ": 1" is to use individual bits to store the bool state of
these class values. Because true != 0, this worked. But it was likely to
bite someone sometime. (My bad: 0fe17e22f6.)
This commit also adds m_accepts_optional_like_value to the bit field and
sets the default false value in the constructor.
Because we cannot set a default value during declaration (until C++20).
make sure future coders know to set the preferred default in the
constructor.
Closes#213
Signed-off-by: Sean Robinson <sean.robinson@scottsdalecc.edu>
This allows updating attached object properties without holding external
references to the various Argument and ArgumentParser objects.
Closes#227
Signed-off-by: Sean Robinson <sean.robinson@scottsdalecc.edu>
