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Compiler Error C2760

  • Artikkeli

syntax error : expected 'name1' not 'name2'
syntax error : unexpected token 'token1', expected 'token2'
syntax error: 'token1' was unexpected here; expected 'token2'

Remarks

There are several ways to cause this error. Usually, it's caused by a token sequence that the compiler can't make sense of.

Example

In this sample, a casting operator is used with an invalid operator.

// C2760.cpp
class B {};
class D : public B {};

void f(B* pb) {
    D* pd1 = static_cast<D*>(pb);
    D* pd2 = static_cast<D*>=(pb);  // C2760
    D* pd3 = static_cast<D*=(pb);   // C2760
}

The new lambda processor available under /std:c++20 or later, or under /Zc:lambda, enables some new conformance-mode syntactic checks in generic lambdas. The legacy lambda processor compiles this code without warnings, but the new lambda processor produces error C2760:

void f() {
    auto a = [](auto arg) {
        decltype(arg)::Type t; // C2760 syntax error: unexpected token 'identifier', expected ';'
    };
}

This example shows the correct syntax, now enforced by the compiler, which works in all /std modes:

void f() {
    auto a = [](auto arg) {
        typename decltype(arg)::Type t;
    };
}