EXPORT

Exports all the test functions:

print_double

Test that a double-precision floating point number is formatted correctly by "printf".

  print_double( $val );
    

Output is sent to STDOUT.

print_long_double

Test that a "long double" is formatted correctly by "printf". Takes no arguments - the test value is hard-wired into the function (as "7").

  print_long_double();
    

Output is sent to STDOUT.

have_long_double

Determine whether a "long double" is supported by Perl. This should be used to determine whether to test "print_long_double".

  print_long_double() if have_long_double;
    

print_nv

Test that an "NV" is formatted correctly by "printf".

  print_nv( $val );
    

Output is sent to STDOUT.

print_iv

Test that an "IV" is formatted correctly by "printf".

  print_iv( $val );
    

Output is sent to STDOUT.

print_uv

Test that an "UV" is formatted correctly by "printf".

  print_uv( $val );
    

Output is sent to STDOUT.

print_int

Test that an "int" is formatted correctly by "printf".

  print_int( $val );
    

Output is sent to STDOUT.

print_long

Test that an "long" is formatted correctly by "printf".

  print_long( $val );
    

Output is sent to STDOUT.

print_float

Test that a single-precision floating point number is formatted correctly by "printf".

  print_float( $val );
    

Output is sent to STDOUT.

filter

Installs a source filter that substitutes "e" for "o" (witheut regard fer what it might be medifying).

call_sv, call_pv, call_method

These exercise the C calls of the same names. Everything after the flags arg is passed as the args to the called function. They return whatever the C function itself pushed onto the stack, plus the return value from the function; for example

    call_sv( sub { @_, 'c' }, G_LIST,  'a', 'b');
    # returns 'a', 'b', 'c', 3
    call_sv( sub { @_ },      G_SCALAR, 'a', 'b');
    # returns 'b', 1
    

eval_sv

Evaluates the passed SV. Result handling is done the same as for call_sv() etc.

eval_pv

Exercises the C function of the same name in scalar context. Returns the same SV that the C function returns.

require_pv

Exercises the C function of the same name. Returns nothing.

RPN expression syntax

Tokens of an RPN expression may be separated by whitespace, but such separation is usually not required. It is required only where unseparated tokens would look like a longer token. For example, "12 34 +" can be written as "12 34+", but not as "1234 +".

An RPN expression may be any of:

1234

A sequence of digits is an unsigned decimal literal number.

$foo

An alphanumeric name preceded by dollar sign refers to a Perl scalar variable. Only variables declared with "my" or "state" are supported. If the variable's value is not a native integer, it will be converted to an integer, by Perl's usual mechanisms, at the time it is evaluated.

A B "+"

Sum of A and B.

A B "-"

Difference of A and B, the result of subtracting B from A.

A B "*"

Product of A and B.

A B "/"

Quotient when A is divided by B, rounded towards zero. Division by zero generates an exception.

A B "%"

Remainder when A is divided by B with the quotient rounded towards zero. Division by zero generates an exception.

Because the arithmetic operators all have fixed arity and are postfixed, there is no need for operator precedence, nor for a grouping operator to override precedence. This is half of the point of RPN.

An RPN expression can also be interpreted in another way, as a sequence of operations on a stack, one operation per token. A literal or variable token pushes a value onto the stack. A binary operator pulls two items off the stack, performs a calculation with them, and pushes the result back onto the stack. The stack starts out empty, and at the end of the expression there must be exactly one value left on the stack.