mirror of
https://github.com/dankamongmen/notcurses.git
synced 2024-11-18 03:25:55 +00:00
b5d8549bb3
This is to make it possible, in the future, to create multiple instances
of `NotCurses` for multiple terminals. The first instance of
`NotCurses` becomes the default one, so that any instances of other
classes that aren't explicitly created with a pointer to another
`NotCurses` instance still work as expected.
Note that currently trying to call `notcurses_init` twice results in the
following error for me:
0x55555559bfc0 is already registered for signals
Couldn't drop signals: 0x55555559bfc0 != 0x5555555b6720
terminate called after throwing an instance of 'ncpp::init_error*'
Program received signal SIGABRT, Aborted.
The error is signalled by `setup_signals` and the pointer shown in the
message points to the first `struct notcurses` instance created.
105 lines
2.4 KiB
C++
105 lines
2.4 KiB
C++
#ifndef __NCPP_ROOT_HH
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#define __NCPP_ROOT_HH
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#include <type_traits>
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#include <string>
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#include <notcurses/notcurses.h>
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#include "_helpers.hh"
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#include "_exceptions.hh"
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namespace ncpp {
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#if defined (NCPP_EXCEPTIONS_PLEASE)
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#define NOEXCEPT_MAYBE
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#else
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#define NOEXCEPT_MAYBE noexcept
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#endif
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class NotCurses;
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class NCPP_API_EXPORT Root
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{
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protected:
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static constexpr char ncpp_invalid_state_message[] = "notcurses++ is in an invalid state (already stopped?)";
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public:
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notcurses* get_notcurses () const;
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NotCurses* get_notcurses_cpp () const
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{
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return nc;
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}
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protected:
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explicit Root (NotCurses *ncinst)
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: nc (ncinst)
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{}
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template<typename TRet = bool, typename TValue = int>
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TRet error_guard (TValue ret, TValue error_value) const
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{
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static constexpr bool ret_is_bool = std::is_same_v<TRet, bool>;
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if constexpr (!ret_is_bool) {
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static_assert (std::is_same_v<TRet, TValue>, "Both TRet and TValue must be the same type unless TValue is 'bool'");
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}
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if (ret != error_value) {
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if constexpr (ret_is_bool) {
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return true;
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} else {
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return ret;
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}
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}
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#if defined (NCPP_EXCEPTIONS_PLEASE)
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throw call_error ("Call returned an error value");
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#else
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if constexpr (ret_is_bool) {
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return false;
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} else {
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return ret;
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}
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#endif
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}
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template<typename TRet = bool, typename TValue = int>
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TRet error_guard_cond ([[maybe_unused]] TValue ret, bool error_value) const
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{
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static constexpr bool ret_is_bool = std::is_same_v<TRet, bool>;
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if constexpr (!ret_is_bool) {
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static_assert (std::is_same_v<TRet, TValue>, "Both TRet and TValue must be the same type unless TValue is 'bool'");
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}
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if (!error_value) {
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if constexpr (ret_is_bool) {
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return true;
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} else {
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return ret;
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}
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}
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#if defined (NCPP_EXCEPTIONS_PLEASE)
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throw call_error ("Call returned an error value");
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#else
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if constexpr (ret_is_bool) {
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return false;
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} else {
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return ret;
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}
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#endif
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}
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// All the objects which need to destroy notcurses entities (planes, panelreel etc etc) **have to** call this
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// function before calling to notcurses from their destructor. This is to prevent a segfault when
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// NotCurses::stop has been called and the app uses smart pointers holding NotCurses objects which may be
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// destructed **after** notcurses is stopped.
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bool is_notcurses_stopped () const noexcept;
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private:
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NotCurses *nc = nullptr;
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};
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}
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#endif
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