lokinet/cmake/check_for_std_optional.cmake

# check for std::optional because macos is broke af sometimes

set(std_optional_code [[
#include <optional>

int main() {
   std::optional<int> maybe;
   maybe = 1;
   return *maybe == 1;
}
]])

check_cxx_source_compiles("${std_optional_code}" was_compiled)
if(was_compiled)
  message(STATUS "we have std::optional")
else()
  message(FATAL_ERROR "we dont have std::optional your compiler is broke af")
endif()
check for std::optional as macos can be broke af sometimes 2020-05-15 13:40:24 +00:00			`# check for std::optional because macos is broke af sometimes`

			`set(std_optional_code [[`
			`#include <optional>`

			`int main() {`
			`std::optional<int> maybe;`
			`maybe = 1;`
Don't use std::optional::value() because f u macos This replaces all use of std::optional's `opt.value()` with `opt` because macOS is great and the ghost of Steve Jobs says that actually supporting std::optional's value() method is not for chumps before macOS 10.14. So don't use it because Apple is great. Pretty much all of our use of it actually is done better with operator anyway (since operator* doesn't do a check that the optional has a value). Also replaced most of the `has_value()` calls with direct bool context, except for one in the config section which looked really confusing at a glance without a has_value(). 2020-05-20 19:46:08 +00:00			`return *maybe == 1;`
check for std::optional as macos can be broke af sometimes 2020-05-15 13:40:24 +00:00			`}`
			`]])`

			`check_cxx_source_compiles("${std_optional_code}" was_compiled)`
			`if(was_compiled)`
			`message(STATUS "we have std::optional")`
			`else()`
			`message(FATAL_ERROR "we dont have std::optional your compiler is broke af")`
			`endif()`