# Other macros
This page serves as a reference for macros that are not documented
elsewhere. For now, these macros are separated into 2 rough categories,
"assertion related macros" and "test case related macros".
## Assertion related macros
* `CHECKED_IF` and `CHECKED_ELSE`
`CHECKED_IF( expr )` is an `if` replacement, that also applies Catch2's
stringification machinery to the _expr_ and records the result. As with
`if`, the block after a `CHECKED_IF` is entered only if the expression
evaluates to `true`. `CHECKED_ELSE( expr )` work similarly, but the block
is entered only if the _expr_ evaluated to `false`.
> `CHECKED_X` macros were changed to not count as failure in Catch2 3.0.1.
Example:
```cpp
int a = ...;
int b = ...;
CHECKED_IF( a == b ) {
// This block is entered when a == b
} CHECKED_ELSE ( a == b ) {
// This block is entered when a != b
}
```
* `CHECK_NOFAIL`
`CHECK_NOFAIL( expr )` is a variant of `CHECK` that does not fail the test
case if _expr_ evaluates to `false`. This can be useful for checking some
assumption, that might be violated without the test necessarily failing.
Example output:
```
main.cpp:6:
FAILED - but was ok:
CHECK_NOFAIL( 1 == 2 )
main.cpp:7:
PASSED:
CHECK( 2 == 2 )
```
* `SUCCEED`
`SUCCEED( msg )` is mostly equivalent with `INFO( msg ); REQUIRE( true );`.
In other words, `SUCCEED` is for cases where just reaching a certain line
means that the test has been a success.
Example usage:
```cpp
TEST_CASE( "SUCCEED showcase" ) {
int I = 1;
SUCCEED( "I is " << I );
}
```
* `STATIC_REQUIRE` and `STATIC_CHECK`
> `STATIC_REQUIRE` was [introduced](https://github.com/catchorg/Catch2/issues/1362) in Catch2 2.4.2.
`STATIC_REQUIRE( expr )` is a macro that can be used the same way as a
`static_assert`, but also registers the success with Catch2, so it is
reported as a success at runtime. The whole check can also be deferred
to the runtime, by defining `CATCH_CONFIG_RUNTIME_STATIC_REQUIRE` before
including the Catch2 header.
Example:
```cpp
TEST_CASE("STATIC_REQUIRE showcase", "[traits]") {
STATIC_REQUIRE( std::is_void::value );
STATIC_REQUIRE_FALSE( std::is_void::value );
}
```
> `STATIC_CHECK` was [introduced](https://github.com/catchorg/Catch2/pull/2318) in Catch2 3.0.1.
`STATIC_CHECK( expr )` is equivalent to `STATIC_REQUIRE( expr )`, with the
difference that when `CATCH_CONFIG_RUNTIME_STATIC_REQUIRE` is defined, it
becomes equivalent to `CHECK` instead of `REQUIRE`.
Example:
```cpp
TEST_CASE("STATIC_CHECK showcase", "[traits]") {
STATIC_CHECK( std::is_void::value );
STATIC_CHECK_FALSE( std::is_void::value );
}
```
## Test case related macros
* `METHOD_AS_TEST_CASE`
`METHOD_AS_TEST_CASE( member-function-pointer, description )` lets you
register a member function of a class as a Catch2 test case. The class
will be separately instantiated for each method registered in this way.
```cpp
class TestClass {
std::string s;
public:
TestClass()
:s( "hello" )
{}
void testCase() {
REQUIRE( s == "hello" );
}
};
METHOD_AS_TEST_CASE( TestClass::testCase, "Use class's method as a test case", "[class]" )
```
* `REGISTER_TEST_CASE`
`REGISTER_TEST_CASE( function, description )` let's you register
a `function` as a test case. The function has to have `void()` signature,
the description can contain both name and tags.
Example:
```cpp
REGISTER_TEST_CASE( someFunction, "ManuallyRegistered", "[tags]" );
```
_Note that the registration still has to happen before Catch2's session
is initiated. This means that it either needs to be done in a global
constructor, or before Catch2's session is created in user's own main._
* `DYNAMIC_SECTION`
> Introduced in Catch2 2.3.0.
`DYNAMIC_SECTION` is a `SECTION` where the user can use `operator<<` to
create the final name for that section. This can be useful with e.g.
generators, or when creating a `SECTION` dynamically, within a loop.
Example:
```cpp
TEST_CASE( "looped SECTION tests" ) {
int a = 1;
for( int b = 0; b < 10; ++b ) {
DYNAMIC_SECTION( "b is currently: " << b ) {
CHECK( b > a );
}
}
}
```