refactor: "expression templates" renamed to "symbolic expressions"

docs/appendix/glossary.md

@@ -270,7 +270,7 @@
 [`derived dimension`](#derived-dimension){ #derived-dimension }
 
 :   - A [dimension](#dimension) of a [derived quantity](#derived-quantity).
-    - Implemented as an expression template being the result of the
+    - Implemented as an symbolic expression being the result of the
       [dimension equation](#dimension-equation) on [base dimensions](#base-dimension).
 
 [`dimension equation`](#dimension-equation){ #dimension-equation }

docs/getting_started/faq.md

@@ -159,7 +159,7 @@ The above prints:
 
 Some users could expect to see `42 kWh` or `42 kW h` in the output. It is not the case and for
 a very good reason. As stated in
-[Simplifying the resulting expression templates](../users_guide/framework_basics/interface_introduction.md#simplifying-the-resulting-expression-templates),
+[Simplifying the resulting symbolic expressions](../users_guide/framework_basics/interface_introduction.md#simplifying-the-resulting-symbolic-expressions),
 to be able to reason about and simplify units, the library needs to order them in an appropriate
 order.
 

docs/getting_started/introduction.md

@@ -35,7 +35,7 @@ To achieve this goal, several techniques are applied:
   compile-times and the readability of error messages when compared to the traditional template
   metaprogramming with [SFINAE](https://en.cppreference.com/w/cpp/language/sfinae),
 - [usage of strong types for framework entities](../users_guide/framework_basics/interface_introduction.md#strong-types-instead-of-aliases) (instead of type aliases),
-- [usage of expression templates](../users_guide/framework_basics/interface_introduction.md#expression-templates) to improve the readability of generated types,
+- [usage of symbolic expressions](../users_guide/framework_basics/interface_introduction.md#symbolic-expressions) to improve the readability of generated types,
 - limiting the number of template arguments to the bare minimum.
 
 !!! important "Important: It is all about errors"

docs/users_guide/framework_basics/dimensionless_quantities.md

@@ -141,7 +141,7 @@ ratio of `1` and does not output any textual symbol.
 !!! important "Important: `one` is an identity"
 
     A unit `one` is special in the entire type system of units as it is considered to be
-    [an identity operand in the unit expression templates](interface_introduction.md#identities).
+    [an identity operand in the unit symbolic expressions](interface_introduction.md#identities).
     This means that, for example:
 
     ```cpp

docs/users_guide/framework_basics/interface_introduction.md

@@ -24,7 +24,7 @@ behind this is that:
 
     Also, to prevent possible issues in compile-time logic, all of the library's entities must be
     marked `final`. This prevents the users to derive own strong types from them, which would
-    prevent expression template simplification of equivalent entities.
+    prevent symbolic expressions simplification of equivalent entities.
 
 ## Strong types instead of aliases
 
@@ -103,14 +103,14 @@ inline constexpr struct joule  final : named_unit<"J", newton * metre> {} joule;
 ```
 
 
-## Expression templates
+## Symbolic expressions
 
 The previous chapter provided a rationale for not having predefined types for derived entities.
 In many libraries, such an approach results in long and unreadable compilation errors, as
 framework-generated types are typically far from being easy to read and understand.
 
 The **mp-units** library greatly improves the user experience by extensively using
-expression templates. Such expressions are used consistently throughout the entire library
+symbolic expressions. Such expressions are used consistently throughout the entire library
 to describe the results of:
 
 - [dimension equation](../../appendix/glossary.md#dimension-equation) - the result is put into
@@ -169,7 +169,7 @@ constexpr auto my_unit = one / second;
     constexpr auto my_unit = inverse(second);
     ```
 
-    Both cases will result in the same expression template being generated and put into the wrapper
+    Both cases will result in the same symbolic expression being generated and put into the wrapper
     class template.
 
 
@@ -195,10 +195,10 @@ its unique representation in the library:
 | `sqrt({identity})` or `pow<1, 2>({identity})` |              `{identity}`               |
 
 
-### Simplifying the resulting expression templates
+### Simplifying the resulting symbolic expressions
 
 To limit the length and improve the readability of generated types, there are many rules to simplify
-the resulting expression template.
+the resulting symbolic expression.
 
 1. **Ordering**
 
@@ -246,7 +246,7 @@ the resulting expression template.
 
     Also, to prevent possible issues in compile-time logic, all of the library's entities must be
     marked `final`. This prevents the users to derive own strong types from them, which would
-    prevent expression template simplification of equivalent entities.
+    prevent symbolic expression simplification of equivalent entities.
 
 4. **Repacking**
 

docs/users_guide/framework_basics/systems_of_units.md

@@ -96,7 +96,7 @@ All of the above quantities are equivalent and mean exactly the same.
 
     The above code example may give the impression that the order of components in a derived
     unit is determined by the multiplication order. This is not the case. As stated in
-    [Simplifying the resulting expression templates](interface_introduction.md#simplifying-the-resulting-expression-templates),
+    [Simplifying the resulting symbolic expressions](interface_introduction.md#simplifying-the-resulting-symbolic-expressions),
     to be able to reason about and simplify units, the library needs to order them in an
     appropriate order. This will affect the order of components in a resulting type and
     text output.

src/core/CMakeLists.txt

@@ -55,7 +55,6 @@ add_mp_units_module(
             include/mp-units/framework/customization_points.h
             include/mp-units/framework/dimension.h
             include/mp-units/framework/dimension_concepts.h
-            include/mp-units/framework/expression_template.h
             include/mp-units/framework/quantity.h
             include/mp-units/framework/quantity_cast.h
             include/mp-units/framework/quantity_concepts.h
@@ -67,6 +66,7 @@ add_mp_units_module(
             include/mp-units/framework/reference_concepts.h
             include/mp-units/framework/representation_concepts.h
             include/mp-units/framework/symbol_text.h
+            include/mp-units/framework/symbolic_expression.h
             include/mp-units/framework/system_reference.h
             include/mp-units/framework/unit.h
             include/mp-units/framework/unit_concepts.h

src/core/include/mp-units/bits/get_associated_quantity.h

@@ -22,8 +22,8 @@
 
 #pragma once
 
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/quantity_spec.h>
+#include <mp-units/framework/symbolic_expression.h>
 #include <mp-units/framework/unit_concepts.h>
 
 namespace mp_units {

src/core/include/mp-units/bits/unit_magnitude.h

@@ -32,8 +32,8 @@
 #include <mp-units/ext/prime.h>
 #include <mp-units/ext/type_traits.h>
 #include <mp-units/framework/customization_points.h>
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/symbol_text.h>
+#include <mp-units/framework/symbolic_expression.h>
 #include <mp-units/framework/unit_magnitude_concepts.h>
 #include <mp-units/framework/unit_symbol_formatting.h>
 

src/core/include/mp-units/framework.h

@@ -28,7 +28,6 @@
 #include <mp-units/framework/customization_points.h>
 #include <mp-units/framework/dimension.h>
 #include <mp-units/framework/dimension_concepts.h>
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/quantity.h>
 #include <mp-units/framework/quantity_cast.h>
 #include <mp-units/framework/quantity_concepts.h>
@@ -39,6 +38,7 @@
 #include <mp-units/framework/reference.h>
 #include <mp-units/framework/representation_concepts.h>
 #include <mp-units/framework/symbol_text.h>
+#include <mp-units/framework/symbolic_expression.h>
 #include <mp-units/framework/system_reference.h>
 #include <mp-units/framework/unit.h>
 #include <mp-units/framework/unit_concepts.h>

src/core/include/mp-units/framework/dimension.h

@@ -31,8 +31,8 @@
 #include <mp-units/ext/inplace_vector.h>
 #include <mp-units/ext/type_traits.h>
 #include <mp-units/framework/dimension_concepts.h>
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/symbol_text.h>
+#include <mp-units/framework/symbolic_expression.h>
 
 #ifndef MP_UNITS_IN_MODULE_INTERFACE
 #include <mp-units/ext/contracts.h>
@@ -122,7 +122,7 @@ struct base_dimension : detail::dimension_interface {
  * Derived dimension is an expression of the dependence of a quantity on the base quantities of a system of quantities
  * as a product of powers of factors corresponding to the base quantities, omitting any numerical factors.
  *
- * Instead of using a raw list of exponents this library decided to use expression template syntax to make types
+ * Instead of using a raw list of exponents this library decided to use symbolic expression syntax to make types
  * more digestable for the user. The positive exponents are ordered first and all negative exponents are put as a list
  * into the `per<...>` class template. If a power of exponent is different than `1` the dimension type is enclosed in
  * `power<Dim, Num, Den>` class template. Otherwise, it is just put directly in the list without any wrapper. There

src/core/include/mp-units/framework/dimension_concepts.h

@@ -25,8 +25,8 @@
 // IWYU pragma: private, include <mp-units/framework.h>
 #include <mp-units/bits/module_macros.h>
 #include <mp-units/ext/type_traits.h>
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/symbol_text.h>
+#include <mp-units/framework/symbolic_expression.h>
 
 namespace mp_units {
 

src/core/include/mp-units/framework/quantity_spec.h

@@ -32,11 +32,11 @@
 #include <mp-units/ext/type_name.h>
 #include <mp-units/ext/type_traits.h>
 #include <mp-units/framework/dimension.h>
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/quantity_concepts.h>
 #include <mp-units/framework/quantity_spec_concepts.h>
 #include <mp-units/framework/reference_concepts.h>
 #include <mp-units/framework/representation_concepts.h>
+#include <mp-units/framework/symbolic_expression.h>
 
 #ifndef MP_UNITS_IN_MODULE_INTERFACE
 #ifdef MP_UNITS_IMPORT_STD
@@ -439,7 +439,7 @@ struct derived_quantity_spec_impl :
  * Its dimension is an expression of the dependence of a quantity on the base quantities of a system of
  * quantities as a product of powers of factors corresponding to the base quantities, omitting any numerical factors.
  *
- * Instead of using a raw list of exponents this library decided to use expression template syntax to make types
+ * Instead of using a raw list of exponents this library decided to use symbolic expression syntax to make types
  * more digestable for the user both for quantity specification and its dimension. The positive exponents are ordered
  * first and all negative exponents are put as a list into the `per<...>` class template. If a power of exponent
  * is different than `1` the quantity type is enclosed in `power<Q, Num, Den>` class template. Otherwise, it is

src/core/include/mp-units/framework/quantity_spec_concepts.h

@@ -26,7 +26,7 @@
 #include <mp-units/bits/hacks.h>
 #include <mp-units/bits/module_macros.h>
 #include <mp-units/framework/dimension_concepts.h>
-#include <mp-units/framework/expression_template.h>
+#include <mp-units/framework/symbolic_expression.h>
 
 namespace mp_units {
 

src/core/include/mp-units/framework/unit.h

@@ -33,10 +33,10 @@
 #include <mp-units/ext/inplace_vector.h>
 #include <mp-units/ext/type_name.h>
 #include <mp-units/ext/type_traits.h>
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/quantity_point_concepts.h>
 #include <mp-units/framework/quantity_spec_concepts.h>
 #include <mp-units/framework/symbol_text.h>
+#include <mp-units/framework/symbolic_expression.h>
 #include <mp-units/framework/unit_concepts.h>
 #include <mp-units/framework/unit_magnitude.h>
 #include <mp-units/framework/unit_symbol_formatting.h>

src/core/include/mp-units/framework/unit_concepts.h

@@ -24,9 +24,9 @@
 
 // IWYU pragma: private, include <mp-units/framework.h>
 #include <mp-units/bits/module_macros.h>
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/quantity_spec_concepts.h>
 #include <mp-units/framework/symbol_text.h>
+#include <mp-units/framework/symbolic_expression.h>
 #include <mp-units/framework/unit_magnitude.h>
 
 namespace mp_units {

src/core/include/mp-units/framework/unit_magnitude_concepts.h

@@ -25,8 +25,8 @@
 // IWYU pragma: private, include <mp-units/framework.h>
 #include <mp-units/bits/module_macros.h>
 #include <mp-units/ext/type_traits.h>
-#include <mp-units/framework/expression_template.h>
 #include <mp-units/framework/symbol_text.h>
+#include <mp-units/framework/symbolic_expression.h>
 
 #ifndef MP_UNITS_IN_MODULE_INTERFACE
 #ifdef MP_UNITS_IMPORT_STD